What does "surface finish: 4-8 rms" mean? Answered

I'm looking through parts on McMaster Carr's website, and I came across one of their shafts. What exactly is an "rms" and what does it look like?

Asked by The Ideanator 7 years ago


Too big enclosure for sub woofer?

Last year had a lot of bad luck making my bike sound system. I made some boxes, fried some electronics, etc. The boxes were too big for easy handling, so I'll make another attempt, since spring is coming. I noticed the speaker (driver) did not like higher volumes; very large excursions in the lower Hz range , probably hitting the end of its moving range. It is a closed enclosure, no port. The RMS output of the amp is probably many times lower than the RMS rating of the speaker (driver); logitech 2.1 computer amp with consumer grade sub speaker (6"). Same problem occurs with my home 10" 60 W RMS driver in a closed ca. 70 l - ca.15 Gallon barrel, with a modest 25W RMS amp: I cannot even turn it halfway up:  it is mounted horizontally, and shoots peas 40 cm (16") up! Would it be more helpful to make the box / barrel less square? Like halve the size by putting a diagonal separator in the box? Or is geometry irrelevant and does only volume matter? Perhaps there even might be a formula????

Asked by BobS 7 years ago


Building a car sound system?

I recently got my car and want to boost the sound system by upgrading some speakers and putting an amplifier, i have 2X 30W 4OHMS 1X 350W MAX, 80W nom.  4OHMS My car has a pioneer mp3/cd player  with 4 channels(4x 45W rms) I want to bridge an amplifier to connect the 350W speaker for the rear only and use 2 channels for  the 2 front speakers. my idea is using two channels of the car player for the front. i will have 2 channels free [(left and right)rear] i would connect it to the amplifier, then bridge the amp to connect the speaker. can anyone suggest me a cheap amp to buy and tell me if my idea is correct???

Asked by ARJOON 6 years ago


Batteries, amps, and watts, oh my! Help with my speaker build?

Hey guys, first post here, so be kind, I suppose. :PI'm building a set of speakers, loosely based off of the super loud, super long lasting speakers instructable (found here https://www.instructables.com/id/super-portable-super-loud-long-lasting-battery-/ ) I wanted to take these, and make them significantly better.First of all, I was going to substitute in car speakers. The upside of that is that I also get bass without having to go out and buy woofers and wire up a crossover. I've been looking around on partsexpress, and it seems like most have an impedence of 4 ohms, and range from 75 to 150 RMS. I'm aware that the general rule of thumb is that you double the RMS for the amplifier. However, I'm not sure about soe of the other parts. Should the speakers be wired in series or parallel? If they're wired in parallel, should I be looking for an amp with 2 ohms of resistance, since it's two speakers at 4 ohms? If not, can speakers be easily wired in series?Next question, batteries. Where in the hell do I get some good LiPo batteries? I know this thing is going to go through electricity like candy, so I want high wattage and high capacity.The wattage brings me to my last question. These speakers are rated for a maximum input of 70 watts or more. I can't get a battery to go anywhere near that capacity. Will the speakers be harmed by a lower wattage supply? Significantly lower, I might add, most probably not more than twelve, even if I array the batteries into my own pack. How will that affect the speakers?EDIT: I could realistically reach more than that, although it'll start getting really expensive really fast.Sorry, one last; concerning the rule of thumb in which you should double the voltage of the speakers RMS for your amp, if I can't find an amp that does that exactly, should I have my amp be slightly overpowered, or slightly underpowered?Thanks for all the help on this one :)

Asked by headinmysights 8 years ago


stereo plus amp is how many watts?

For instance if my stereo is 20w rms and I put an amp of 45w rms will I have 65w rms?

Asked by RichardB263 1 year ago


Multiple Speaker Building Questions! :D

Hey guys, first post here, so be kind, I suppose. :PI'm building a set of speakers, loosely based off of the super loud, super long lasting speakers instructable (found here https://www.instructables.com/id/super-portable-super-loud-long-lasting-battery-/ ) I wanted to take these, and make them significantly better.First of all, I was going to substitute in car speakers. The upside of that is that I also get bass without having to go out and buy woofers and wire up a crossover. I've been looking around on partsexpress, and it seems like most have an impedence of 4 ohms, and range from 75 to 150 RMS. I'm aware that the general rule of thumb is that you double the RMS for the amplifier. However, I'm not sure about soe of the other parts. Should the speakers be wired in series or parallel? If they're wired in parallel, should I be looking for an amp with 2 ohms of resistance, since it's two speakers at 4 ohms? If not, can speakers be easily wired in series?Next question, batteries. Where in the hell do I get some good LiPo batteries? I know this thing is going to go through electricity like candy, so I want high wattage and high capacity.The wattage brings me to my last question. These speakers are rated for a maximum input of 70 watts or more. I can't get a battery to go anywhere near that capacity. Will the speakers be harmed by a lower wattage supply? Significantly lower, I might add, most probably not more than twelve, even if I array the batteries into my own pack. How will that affect the speakers?Sorry, one last; concerning the rule of thumb in which you should double the voltage of the speakers RMS for your amp, if I can't find an amp that does that exactly, should I have my amp be slightly overpowered, or slightly underpowered?Thanks for all the help on this one :)

Posted by headinmysights 8 years ago


Can you charge (safely) a 450V Capacitor by using a voltage multiplyer/dobler on mains (240V RMS)? Answered

I'm looking at building a coilgun and wondering if you could charge my caps via a voltage dobler on mains. Also is ther a formula for calculating the output of a voltage multiplyer? Thanks a bunch,                Mike

Asked by muttyfutty 8 years ago


Can anyone explain RMS vs average? (particularly the math portion, and the intuition)? Answered

My current understanding of RMS (Root Mean Square) is that it is the equivalent AC voltage/current/power necessary to drive a resistive load the same around as the DC voltage/current/power counterpart. However, I am a bit confused about the math involved that can apply to all waveform. I know the conversation factor for sine waves is 1/ sqrt(2), and that the conversion factor for square waves is 1:1 (no difference) On my graphing calculator, if I take the square root of the definite integral (from 0 to pi, integrating the x ) of the sin(x)^2, then divide that by the period, pi, I get the correct answer. However, what is the purpose of the squaring, then square-rooting? is it purely to perform a absolute value mathematically? If so, then I should be able to simply integrate the absolute value of the sine, and divide the result the the period the integration was performed over. If it period it was performed over was 0-pi, then there is no need to even take the absolute value! But this method returnees 0.636619... not 0.707106... Intuitively, it makes much more sense to me to somehow take the mean average of the continues |sin(x)| function. I know this can be done with desecrate numbers (a sequence, perhaps) and by taking the sum of them, and dividing it by the number of 'elements.' (series's, anyone?). I would expect this average is what determined the average power used by a load. EDIT: Wikipedia states that "The true RMS value is actually proportional to the square-root of the average of the square of the curve, and not to the average of the absolute value of the curve." So it appears I have just proven this. But Why???? What is so special about the squaring and rooting??? Please don't bombard me with heavy math, as I am not familiar with calculus, and have barely passed pre-calculus (The class was supposed to touch upon series and sequences, and integrals, derivatives, limits, etc. but due to show days and delays, the class only covered trigonometry --the bare essentials--). I do not yet fully understand single-variable integrals, let alone multi-variable calculus. I really just want a better intuition of RMS. More than likely, there is probably some confusion I have about integrals in general, and how to calculate them on-paper.

Asked by -max- 3 years ago


Amp for a homemade speaker box with car speakers?

The speakers are almost definitely going to be a pair Sony Xplod XS-R5743's Specs: 4-Ohm 190W Peak 35W RMS So with these power specs, what should the power ratings for the amp be? I considered building an amp, and unless there is something I've missed, it looks cheaper just to buy a car amp and just make it run from a wall outlet after a transformer. Especially when every amp that I see being built is a low power 1W LM386. Please, let me know the best method for amplifying the audio to these speakers and the required power. Thanks

Asked by manouttatime 7 years ago


arduino? Answered

Can i use arduino mega instead of arduino uno

Asked by Kanak Shilledar RM 10 months ago


heat gun? Answered

Question Body: give us more detail on your question...

Asked by Kanak Shilledar RM 1 year ago


Bridging two identical amplifiers to increase the rms output power Answered

Hi, i was wondering  if i can bridge two identical amplifiers, to drive a 4ohms 400w-rms dvc subwoofer, the second problem is what about the power supply, i don't think i can use one 24volt car battery for the two amps so can i use two separate car battery, below is the amp i want to bridge. JBL GX-A3011SI 1200W Class D Mono Car Subwoofer Amplifier. Product Info: Low Distortion Class AB Design Active Low Pass Filter Noise Rejecting Differential Inputs Filter Range 30Hz to 320 Hz Peak Power Output  1200 W 4-Ohm Power Output  200 W RMS x 1, 2-Ohm Power Output  300 W RMS x 1, Design Low Distortion Class AB Input Variable Line Level and Speaker Level Signal to Noise Ratio  93dB since the output rms @4-ohms is "200 W RMS" so bridging two of this amps will give me a 400w-rms. Thank you. Regards

Asked by Lima79 1 year ago


Problem with a 30-0-30VDC @10amps transformer/SMPS and 400WATT RMS mono amp(not PMPO) Answered

First of all thank you so very much, i have successfully build my rectifier but now i am having a problem with it. Can a 30-0-30VDC @10amps transformer/SMPS, power a 400watt-RMS car sub @4ohms with a 400watt-rms mono amp. When i tested the 400watt subs, the gain is too low or am i doing something wrong here. This is my 400watt-rms amp... https://photos.google.com/photo/AF1QipONhTIOOnP8U687FDjOuiDSncup5C43T-i9IVfk https://photos.google.com/photo/AF1QipO3N4hMdLNHFyXsTngmMNPuHCaouWW9LfA_hUqV Thanks much, appreciated.

Asked by Lima79 1 year ago


4 way spekaers. is the xover schematic correct?

My supplies A Tweeter with a frequency response of 20 KHz ~ 40 KHz, 8Ohms, 75Watts RMS/3000Watts Max, and Sensitivity of 105dB. A 4” Subwoofer with frequency response of 25Hz ~ 160Hz, 4Ohms and 25 Watts RMS Two 4” Full Range Speakers of 4Ohms and 5 Watt RMS Is the schematic mentioned in the pic is a suitable xover for my system please clear the nearest values to me

Asked by subhamsingh236 4 years ago



Can I use a speaker motor to "absorb" energy?

I am looking to use a speaker motor or a high wattage speaker minus the cone to absorb some of the power coming of a tube amp. The setup would be a 4x12 cab rated around 300-400 watts, 120watt tube head, and the speaker motor. I am hoping that the speaker would absorb some of the power and allow me to drive the tube head harder but without blasting the windows out of a building. Power tube saturation is a great sound and not alway easy to get ... even though the cab is capable of handling most of the heads power ... it gets deafening quick. Let me know what you think and feel free to comment if I can explain in further detail. Thank You! AFF

Asked by AFF 8 years ago


Installing a sub in a car

I had the idea to put a sub in my car. i bought everything (sub+amp). But first I tried to wired it in my car, my friend told me to look at my alternator to see if he could take the load. My amp and subs are 600W rms. So I,ve look at the specification of my car....my alternator is an 80 amp. Its the only thing about alternator I saw in a lot of diffent specs.\ So. 80 amp alternator 600W rms amp 600W rms sub Could my alternator could take the load???? thanks!

Posted by johnybody 7 years ago


How to pick best battery for amplifier?

Hello, I ordered this amplifier and I need to pick best battery for this amplifier. Would be great to power it for at least 3-4 hours on maximum volume (200W rms subwoofer and 2x50W rms speakers). I need lightweight battery and powerful battery, size does not matter, budget is low so nothing overpriced I do not want.

Posted by RobertasP4 9 months ago


How to pick best battery for amplifier? Answered

Hello, I ordered this amplifier and I need to pick best battery for this amplifier. Would be great to power it for at least 3-4 hours on maximum volume (200W rms subwoofer and 2x50W rms speakers). I need lightweight battery and powerful battery, size does not matter, budget is low so nothing overpriced I do not want.

Asked by RobertasP4 9 months ago


4 way spekaers - is the xover schematic correct?

My supplies A Tweeter with a frequency response of 20 KHz ~ 40 KHz, 8Ohms, 75Watts RMS/3000Watts Max, and Sensitivity of 105dB. A 4” Subwoofer with frequency response of 25Hz ~ 160Hz, 4Ohms and 25 Watts RMS Two 4” Full Range Speakers of 4Ohms and 5 Watt RMS Is the schematic mentioned in the pic is a suitable xover for my system please clear the nearest values to me Thanks in Advance

Asked by adarshnarsaria 4 years ago


Portable speaker?

I have a 12v battery and a radio head unit along with 2 JBL speakers that are 70w rms 210w peak and 4 ohms  will this work if connected up?

Asked by Jackyboy95 3 years ago


How do you make a analog ac line voltage monitor 120 volt (RMS) scale? Answered

I would like to build a analog 120 volt RMS ac power line voltage monitor. That plugs into the wall to monitor my AC line voltage. Using a analog meter for display. How does one go about constructing such a device?  

Asked by sdnsg2 5 years ago


any cad softwares are not working on my pc? then what should I do? Answered

Question Body: give us more detail on your question...

Asked by Kanak Shilledar RM 6 months ago


Help with my supplies? Answered

I have 2 units of 4" woofers of 4 Ohms and 25 watt RMS with a frequency response of 40Hz ~ 170Hz 2 Units of 3'' loudspeakers  4 Ohms and 10 Watts RMS with a frequency response of 160Hz ~ 20Khz and these tweeters  Can I make a 3way Speakers with these supplies and if yes please send me the crossover and L Pad schematics. Thanks In Advance

Asked by adarshnarsaria 4 years ago


How can I speakers in such a way that i get the best outcome in terms of power?

Ok i have 4 speaker which can handle 80W continuous power and having an impedence of 4 ohm each. I also have a 4 channel amplifier. The amplifier outputs are as follow: 60W RMS x 4 @ 4 ohms  80W RMS x 4 @ 2 ohms 160W RMS x 2 @ 4 ohms bridged How can i wire the speakers in such a way that i get the best outcome in terms of power? I've been thinking of wiring 2  sets of 2 speakers in parallel  and connecting them to the amp as bridge stereo. But the problem is that i don't know if it will cause problem to the amp. because the amp is 2ohm stable but i don't know if it is 2ohm stable when bridged 

Asked by ARJOON 3 years ago


Determining the correct specifications of my subwoofer?

I have purchased a local brand sub-woofer which does not comes with any specifications except the following: Impedance: 4 Ohms Output RMS:20 Watts Frequency Response: 40Hz~170Hz Effective Cone Diameter(D): 4" However i wanted to know the following Equivalent Volume(Vas) Free Air Resonance (Fs) Total Q (Qts) Actual System Q (Qtc) Resonance Frequency (Fb) Is there is any way to determine these Thanks in Advance....

Asked by adarshnarsaria 4 years ago


HP 3400a True RMS Voltmeter?

I have had one of these for the longest time and I really know very little of what it is used for.  It seems to work, but it does not appear to measure like a normal voltmeter, you can't just set it to the 30v range and hold the leads against a 9v battery, you seem to have to pulse it.  Does anyone know about them?  How much are they work because I was thinking of selling it and I have everything for it, the unit, the power cord, test leads, a manual etc. Any info on it or how it works would be appreciated! Thanks

Asked by Electric Spectre1 5 years ago


Car stereo puts out much less power than speakers need?

I'm fairly new to car audio. I just put in a Pioneer MVH-370BT headunit into my car, and while it is working great right now, it is evident that I'm going to need new speakers soon because the factory ones are not very good. I was looking at either the Kicker 40CS54 2-way speakers or the Kicker 41DSC54 2-way speakers because many people have recommended these speakers. The problem is on the website, the pioneer headunit only says it puts out 14 watts RMS power while the speakers say that they use up to 75 watt RMS. I'm trying to avoid getting an amp because I'm going to be putting the speakers in myself and i don't want to have to drill a hole through the firewall. So, my question is what will happen if I run the speakers with the 14 watt RMS receiver? Will it just not play very loud? Will the sound be very distorted if I try to play it loud? Is this bad for the speakers? Thanks!

Asked by JoeG4 3 years ago


I need to remotely turn on and off 55 tvs in school classrooms. How can I build an IR system for this? Thanks, RM

I want to build a hardwired IR network in the school building to each of the tvs. What all components would be needed and how to assemble these components?

Asked by 9 years ago


Speaker and Amplifier Wiring Please Help!

As you can see I have a car amp and some speakers, can anyone with speaker or amp knowledge please tell me (or even better draw a diagram :D) of the best (most efficient / loudest) way to wire all these up, the specs are as follows… AMP 2/1 channel amplifier Max power – 400 watt 4 ohm stereo – 2 x 75 watts RMS 2 ohm stereo – 2 x 100 watts RMS ROUND SPEAKERS (midwoofers) 4 ohm 25 watt RECTANGE SPEAKERS (tweeters) 4 ohm 4 watt Thanks for your help! (P.S my plan is to build a portable sound system powered by a car battery)

Posted by superrob 6 years ago


Suggestions for amp? Answered

Hello all, As my question shows, I am looking for suggestions of amps I should use to drIve my speakers. There are 2 speakers RMS rated at 3.7W and 4ohm. Any suggestion is appreciated. Many thanks in advance EDIT: it would be best for the amp to use less than 9v so that it is still portable.  Please suggest 

Asked by michalk1 3 years ago


Electronic sleep timer for my car stereo

I live in my campervan and often listen to music before I go to sleep. I have a Sony CDX-GT470US carstereo and Sony RM-X4S wired remote for it. here is a schematic for the remote www.panuworld.net/minidisc/fordsony/rm-x2s.gif It has also a wireless remote so when I am in bed I can turn it off with it unless I have fallen asleep. Sometimes I wake up in the middle of the night with the radio still on. This wastes power and might flatten the battery. So I need some device which attaches into the wired remote parallel to the off switch. Then some type of timer circuit which gives a 2 second pulse to short the contacts to turn off the stereo. Any ideas appreciated.

Posted by pellepeloton 8 years ago


What is the recommended speaker wattage rating (6.5" / 3 way) for a 4x45 watt RMS car stereo?

I am installing a new Sony car stereo and want to upgrade the existing speakers, I want to get the best compatible speakers for the stereo's wattage rating that will give me the best sound performance without overloading the speakers or having insufficient power to the speakers for sufficient volume/sound reproduction.

Asked by PE_in_AZ 6 years ago


56_0_56VDC = 112VDC Answered

Hi, Just say a 500watt RMS Mosfet mono amplifier the maximum input VDC is rated at 56_0_56VDC, when we test with a multimeter the +56v and -56v voltage is 112VDC, so i am wondering does the amplifier uses the entire 112VDC or it splits the voltage into two 56_0_56VDC because if the amplifier uses the entire 112VDC then i think the 112VDC is a lot of voltage and could burn the amplifier. Thank you.

Asked by Lima79 1 year ago


How to rip DVD and convert video to ipod on Windows and Mac?

In modern world, we have so many ways to share our feeling, interest, etc. with our families and friends, even those who we have never seen. So the problem rip DVD,put your favourite on ipod come. Our DVD Ripper review experts have tested many similar DVD Rippers and get this result: dvd video reviews The article includes four parts. Part 1: Rip DVD movie to iPod (Windows) Part 2: Convert AVI, WMV, MPEG, RM, RMVB, ASF, MOV, DivX, XviD, MPG to iPod MP4 or H264 format (Windows) Part 3: Rip DVD movie to iPod (Mac) Part 4: Convert AVI, WMV, MPEG, RM, RMVB, ASF, MOV, DivX, XviD, MPG to iPod MP4 or H264 format (Mac). See more informations: dvd video converter

Posted by iphonebooy 7 years ago


What amp do I get for my speakers? Suggestions please :)

I'm looking to find an amp for RB-41 II Bookshelf Speakers for home use. I'm looking for two amps. 1) an amp that will play these speakers well an then 2) upgrade to an amp that can handle more speakers and a sub woofer.The speaker's power handling is 50W RMS/ 200 W peak, with nominal impedance of 8 ohms

Asked by leedaasianboy 5 years ago


Star Trek Door, Sleek Word Clock, Speed Racer Cake

Star Trek Door Sleek Word Clock Speed Racer Cake Bike Party Trailer Cut a Royal Seal Issue 50 Has Arrived! Glass Tiles from Bottles Bubble Wrap To-Do List RM 100 Mega Rocher CD Scratch Art Fix a PS3 in an Oven 6-Sided Snowflake Dremel Table Mount

Posted by randofo 7 years ago


How to lower the DC voltage of a transformer. Answered

Hi, at last i have got a 45-0-45 transformer @5amps, but now i have a problem, the VDC output i am getting is 74vdc but my 400watt rms mono amp's maximum input VDC is 56vdc, so i don't think its a good idea to feed the 74vdc, so is there a way to lower the 74vdc, BTW please don't advice me to unwind the secondary coil because i am new to electronics and the transformer didn't come cheap, so i don't want to break it. i am using IN4007 diode and 4700uF 63V cap for the bridge rectifier. ​I just forgot to give some details on this topic. The transformer is to use with the 400watt rms mono amp. The amp has 8 MOSFETS side by side, 4 IRFP9240 and 4 IRFP240 and 6 transistors. https://s23.postimg.org/l8onxw1wb/image.jpg https://s17.postimg.org/czg1ynam7/image.jpg BTW the transformer shows 45-0-45 VAC but when i test with a multimeter, the VAC is 53volts. Thank you. Regards.

Asked by Lima79 1 year ago


how do I free the memory on the raspberry pi?

Rm -rf /boot/*.elf /boot/*.bin /boot/*.img apt-get install git apt-get install ca-certificates wget http://goo.gl/1BOfJ -O /usr/bin/rpi-update && sudo chmod +x /usr/bin/rpi-update /usr/bin/rpi-update this is the code I found so do I enter it into the LX terminal or do I enter it into the memory split option?

Asked by nerd7473 5 years ago


How to exercise after contiuous keyboard and mouse usage?

I am feeling a contiuous stress in the wrist area of my left hand. and also some numbness there in the last two fingers, which i think is due to continued keyboard and mouse use. Can anyone suggest some good exercises? and also if someone has good experience of using any ergonomicaly designed keyboards and mouse. Please recommend me one. Thanks

Asked by muhammajunaid 8 years ago


TDA7293 gets hot?

I recently bought some TDA7293 chips in order to make amplifiers, but when I tested one it got hot! I've checked the wiring several times. I'm using this circuit :  http://xtronic.org/circuit/amplifier/circuit-power-audio-amplifier-stereo-with-tda7293-200-watts-rms-total-includes-power-supply/ I'm using +-8V supply, which is bellow the minimum voltage according to the datasheet, so it shouldn't work nor get hot!  If I use a higher supply voltaje it gets hot faster. Any ideas?

Asked by Cesar_Gabriel 2 years ago


Low frequency amp? Answered

For a future project (blue barrel infra sub woofer with ducted fan) I'm already looking for parts. I see most amplifiers and amp chips (like the TDA7294) have a frequency response usually 20 - 20,000 Hz. But I'm interested in a range from 0- ca 40 Hz. As far as I understand, the low cutoff is to protect the driver (speaker). Would it be possible to circumvent the low cutoff, or would I have to build from scratch? (I'm thinking in a 70 - 150 W RMS range).

Asked by BobS 8 years ago


Need assistance - hooking up 30W speakers to 17W amp - will not work

Hello All, My knowledge of audio is VERY limited and I need a little help. I'm trying to recycle my old car stereo by turning it into a home stereo. The car stereo outputs at 17W RMS and 50Wmax per channel (4 channels) I have a set of speakers that are 60W max, 30W RMS, 4Ohm. From what I understand the weaker amp should power more powerful speakers without much issue.  I tested the setup and ran into a problem. The speaker works fine as the stereo powers up and begins to play.  As I increase the volume the speaker suddenly cuts out. The stereo volume goes up to 50 (I don't know what 50 represents. Arbitrary value?) and the speaker cuts out around 21. The volume at this level is much, much, lower than what it was when this stereo was in my car.  I assume this is due to the power mismatch with the speakers.  Is this a fair assumption? What could be the reason for the speaker cutting out? The speaker wire I used is 22 gauge, which could be a little thin.  It's all I had on hand while testing. Could this be related?

Asked by iTinkers 7 years ago


What happens when you induce two currents of differing wavelength on the same line? Answered

If I induce two currents of differing wavelengths on a single conductive body, say an iron pipe for example, how can I calculate what the resulting signals wavelength will be? Is it as simple as taking the root mean square of the frequency of the signals? Any ideas for calculating the voltage of the final signal? ------------------------------------------------------------------------------------------------------------------------- Example: Signal 1: 60hz at 100v Signal 2: 75hz at 100v RMS frequency sqrt(((60^2)+(75^2))/2) =  67.9153 ------------------------------------------------------------------------------------------------------------------------- Thanks  a bunch!

Asked by paulcauchon 7 years ago


Cheap Auto Range Multimeter? Answered

As the question states. Anyone know of a good, cheap, auto range DMM? The more features and higher ranges the better. I don't need true RMS, would like capacitance checking ability as I reuse a lot of used electronic components from stuff people throw away, and I always saw auto range as more of a convenience, not a necessity. I would like to spend as little as possible, as I'm sure I'll eventually burn it out on one of those used components, like I did the $20 harbor freight clamp meter I had.

Asked by Dochide 6 years ago


Flexible EL Display, Recirculating Gravy Fountain, USB Nintendo Gamepad

Flexible Electroluminescent Display Recirculating Gravy Fountain USB NES Gamepad Easy Backpacking Stove Spiced Pumpkin Cheesecake Letter from the Editor Glowing LED Tube DIY Thanksgiving Enter the RM 100 Contest Inner Tube Skull Purse Around the Room Marble Track Electronic Beehive Scale Xbox Kinect TV Mount DIY CMOS RAM Memory Guitar Neck Repair Blender Fish Tank Bottle Cap Antenna Protector Instructables.com - 82 2nd St. - San Francisco, CA

Posted by randofo 7 years ago


Should I put sound deadening/dampening material in my car?

I've just spend a little over a grand and blown the majority of my budget on new speakers amp wiring and a headunit for my car. I haven't bought any subwoofers. I'm happy to go over this budget if sound deadening will make a large difference. Anyway, I was just wondering- road noise and all of that aside, will sound deadening make my stereo sound noticeably better? As in, sound quality alone Should point out that the speakers are 300 watts rms all up. 6.5" "woofer" 4" midrange and a tweeter that's under an inch each side. Thanks heaps!

Asked by pete54321 5 years ago


How to convert Car subwoofer (Soundstream SPLX 152 HX) for home theatre use ? Thanks

SPECS: Impedance 2 ohm (Dual Coil) Sensitivity 91 dB Fs (hz) 35.96 Qms 6.476 Vas (ft³) 87.56 Cms (mm/n) 0.0794 Mms (g) 247.1 Xmax (mm) 13.00 Xmech (mm) 19.50 Piston Diameter (in) 13.19 Sd (in²) 136.6 Qes 0.503 Re (Ω) 2.95 Z (Ω) 4 BL (Gauss) 18.09 Rms Power (watts) 1,250 Qts  0.467 NO (%) 0.78 1w/1m SPL (dB) 90.95 Voice Coil Diameter (in) 3" Impedance (Ω) DVC 2Ω M-vd (ft³) 0.298  

Asked by Xenu11!! 5 years ago


i have a broken craig jukebox and want to salvage speakers and case to make a working one

I have a broken craig jukebox Bluetooth speaker system, it wont turn on at all bought for 8$ and i am trying to figure out if i can salvage the speaker and possible the lights. i thought i could use something like a breadboard to rewire the speakers and lights to make it work at least of a aux cord and if possible Bluetooth. this is a link to the speaker https://craigelectronics.net/product/cht935bt/   its got (4 x 5w rms output) speakers. i'm looking for a cheap alternative to get it working, again i don't know why its not working i put the cord in and it doesn't do anything from a quick look i saw nothing in the circuits that's broken or burnt out.

Asked by Rogardin. 6 months ago


Can i run my 2.5 home computer speakers using a bike or car battery ?

I would like to play my computer speakers  Speaker Features Speaker Type Active Nominal Output Power (Total) 32.0 Watt Max (RMS) Output Power (Total) 64.0 Watt for more specifications -----> http://reviews.cnet.com/pc-speakers/x-230-2-1/4507-3179_7-30993634.html?tag=mncol;subnav want to connect it to a new car or bike battery ( not in the vehicle ) but carry a battery and distilled water to keep the charge when i go camping would like to carry it so we could have some fun in the woods.. but my question is how do it connect the two  and will the output from the battery will be correct for the speakers ?... i love my speakers and dont want to conk them off ..

Asked by Darktribe 6 years ago