Low Voltage Disconnect?

Hi, I would just like to seek your assistance and idea for the observation below on my experiment: I have a gadget that is being charge by a 2w 9v solar panel, the problem is I haven't place a blocking diode and I observed that when I tested the charging slot there is about 0.16v output. To clear it that was supposed to be my input voltage. 1. Question is why does it produce an output voltage even though it is imy input voltage? 2. Would the 0.16volts output have a significant effect on my system during night time and or bad weather? Please give facts and computation if possible. 3. If I want to step down my input voltage of 9volts to 4.5 volts can you give me the idea how to do it. Well, I am asking you this because your insights and helps for me in the past are very helpful for my science project. Thank you teachers

Question by mitchiko   |  last reply


Down loweing photos

How come when I try to down lowed an Instructables I don't get the Photos?Thanks

Topic by woodie1949   |  last reply


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).

Question by BobS   |  last reply


low light video

I need to wirelessly video a seance in low light and remotely view what the camera captures as it is happening. Web cam? GoPro? Android Galaxy III? How could I view the digital video remotely? Laptop? Another phone? Thanks for ideas.  Ourladyofquacamole

Topic by ourladyofguacamole   |  last reply


Low Speed Motor?

I want to make a baby night toy with multi color LEDs and a rotation device. For which i need a low speed motor. Can someone help me find such a motor or give any idea on how an ordinary motor can be used for this purpose? thanks in advance for all the feedback.

Question by muhammajunaid   |  last reply


Low Power pc?

Right for some time now I have been thinking of building a computer that is low power 20w max needs to have some processing power preferable duel core i have been looking at 'intel D510MO' link to spec > http://www.ebuyer.com/product/191127 What i would like is for someone to advise me on what to buy to keep the power low (20w or less) and the performance high at a fairly low price

Question by Daniel Deacon   |  last reply


Low battery indicator

Can someone please provide me with a schematic to turn on an LED when a 9v PP3 gets low (~<20%), no microcontrollers, the simpler the better. I am hoping you can do this with a few diodes, transistors, resistors, and maybe some capacitors, but I can't think how this would work.

Topic by andy70707   |  last reply


Low voltage AC?

How can I make a simple circuit that will produce alternating current using 1.5 to 9v power supply? This is an experiment for using an AC voltmeter - that is, making the needle move.

Question by brandegor   |  last reply


Low voltage cutout

Hello, I need a simple circuit to switch off a high brightness LED that draws 200ma when my four cell Ni-MH battery pack drops to 4.0v(1.0v per cell) Nothing too complicated, something with a transistor, a comparator circuit, and a zener or an all in one IC? I've tried a few "this should work" circuits and then have been told, "well I haven't actually built one". Thanks.

Topic by jefflahay   |  last reply


Low quality prize

After placing second in a contest, I was very disappointed to find that the prize tool was a low quality tool from harbor freight which broke the first time I used it. I was also disappointed to see that they greatly overstated the $ value of the tool by linking to the most overpriced seller they could find (double the going rate for the tool). Last time I placed in a contest, the tool was a very nice dremel which I have used often and has not broken. Would be nice if they would give us quality tools again.

Topic by TheNecromancer13   |  last reply


Low Cost CNC? Answered

Does anybody know if there is a small, personal CNC in the range of under $1000? I do not feel I am ready to make my own, though I know there are plenty of 'ibles about them that I'm sure are good. I am looking to purchase a CNC, software, cabling, bits and all. Is there even such one as cheap as this? if so, where would I find one?

Question by dkop1   |  last reply


Low friction "bearings"

For several of my projects I required some sort of bearing that would not only allow for a minimised free play but also very low friction.Before you get too exited: This is not a new type of bearing or anthing for heavy duty loads, not even for ongoing use without servicing.I found that even slightly heavier things rotated on makishift bearing far easier if the axle was verticall instead of horizontally.This gave me the idea to try a simple needle-bearing approach.This is how it goes:1. Grind and polish your axle to get a nice needle point - it must be perfectly centered!I prefer to do this with the axle in a fast spinning drill on a fine grinder.The polishing in a simlilar way, but please do not try it with a cloth in your hand on a spinning axle!2. The other part of the bearing is a screw or pin with a punch mark.I grinded and polished a punch for this so it has an angle of 60° and polished it to a mirror finnish.If alignment is of importance then of course the pin/screw must work for this purpose!If in doubt make it spind an use a pencil to get the true center.A drop of sewing machine oil and it spins nice and with very little friction.The key is to adjust the gap(s) between axle and punch mark to next to nothing.You don't want any pressure along the axle as you would "drill" a hole into your mounts.And you don't want it too loose to avoid wobble.I hope it might give you an idea for your next project.

Topic by Downunder35m 


Laptop with low Connectivity

I have an HP Windows 7 laptop that always had fast internet up until 4 months ago. Its been having 2-3, or sometimes 1 bar now. Im trying to use my personal hotspot but thats not even working. My sister has a Windows 7 laptop as well, uses the same internet and still has better internet connectivity than I do. FULL BARS! I know my laptop is capable of having fast speed too, I just don't know how. I think there is a setting or program stopping it from having better connects.How do I fix this?

Topic by JadeKS   |  last reply


inverter

I am making an inverter whivh converts 12 V dc to 230 V ac i am using 2 33 ohm resistor of 1 watt to connect the load on transformer whenever i switch on the ckt the 1 watt resistor are heating to much and multimeter does not show any voltage i am using 12 Volt dc 2.5AH battery as power supply what is the problem

Topic by AbhishekR2   |  last reply


Problem with low battery indicator

Hi guys, I have built a low battery indicator circuit for a 6V battery source. It will light up a led when the voltage reaches below 5V. The 6V battery source powers a servo motor, which is controlled by a microcontroller. The problem I have is that when the servo motor rotates, the led lights up. And when the servo stops rotating, the led goes off. This happens even when the battery is above 5V. Any idea what is wrong? And how I could rectify the problem? I have attached the circuit of the low battery indicator, if it helps.

Topic by kurtselva   |  last reply


Favorite Low Carb Recipes?

My other half and I have recently come to the conclusion: you can only eat so much talapia. We need help. He's a type one diabetic (the kind you get when you're a kid and some nasty virus destroys your poor pancreas) so that means limited carbs, and preferably the good kind of carbs (fruits, whole grains, etc). I've tried looking up recipes online only to find several very fancy, very expensive low carb dishes. Please help. We are college students who cannot turn to Ramen for this solution! Cheers and many thanks to you, Heather

Topic by mooseinakilt   |  last reply


PVC pipe at low temperatures

I have a question for spudgunners and other people who know about PVC. I've heard that PVC becomes bitter at low temperatures, so you shouldn't expose your spudgun to low temperature, but is it okay to leave it out in the cold and then warm it back up for use later? Does that affect the strength of the PVC? I have a problem storing some PVC in an heated environment during the winter.

Topic by starwing123   |  last reply


Low voltage health problems

Hello, I saw a great project on youtube, a water button, and gave it a try. it works, all it does is when one touches water, a led turns on, just a proof of concept. But what I was worried about, is if there are any negative health impacts of 3.3 v going though you and into the ground? The power is not noticeable, but still, I worry. ps. I did Google this, but couldn't find anything.

Topic by penguins   |  last reply


Quality servos for an low price? Answered

Where can i get good quality servos for an low price?

Question by MACKattacksnipe   |  last reply


Low Voltage Higher Current?

I am having a strange problem on a USB peripheral.... it is a digital radiography sensor that overheats. I believe it may be due to the power supply to the motherboard, but I don't know for sure. I am ASKING FOR YOUR HELP in reasoning out what may be the cause. Anyone with computer/electronics experience, PLEASE HELP!!! I was told that my power supply is too low voltage, and that current is going up in the USB peripheral causing it to heat up. I always thought V=IR means that if voltage drops so does current. But in other places I read that if voltage drops, current goes up so that the wattage/power usage stays the same according to P=VI. So which is it? V=IR or P=VI ? If my power supply has too low voltage, will the current in the device increase to compensate? Or will it just have a lower current? Does it depend on the circuit and the exact electronics in the USB peripheral? Here is my SETUP. It is SIMPLE: Antec AR-350 power supply connected to a motherboard Asus P5N7A-VM in an ATX case. All I have otherwise is a SATA hard drive and a SATA DVD-ROM in there. That's it! Problem started to happen about 1.5 years after I got the computer. That is why I am thinking maybe it is the power supply, or maybe it is the motherboard?  The computer works fine in every other way! It uses Windows XP and has a wireless keyboard/mouse which also works fine. BIOS settings screen Hardware Monitor shows voltage for USB 5v reading about 4.9v, within tolerance. However, one of my USB peripherals is a digital xray sensor. It works ok a few times, then it starts to overheat and fail. This only happens on this computer. When I use another computer (like a laptop) with the same USB hardware it functions ok and never overheats. I don't have any problems on the other computer, even thought I am using the same software/drivers. I bought a different ATX case with a new power supply, and just moved the motherboard, HD and DVD over. Now the motherboard BIOS shows under Hardware Monitor that it is getting 5.2 V instead of 5v, so it is higher! Also the 12 V is higher (around 12.2v) and same for the 3.3V. All the voltages are HIGHER! So I have yet to test this new configuration with the USB peripheral sensor.  Could the motherboard be faulty? I did notice the motherboard looks "curved" with the area under the CPU sort of bulging out. However, with this motherboard you will see there is a huge heat-sink/fan that gets clamped over the CPU and that may be bending the board. Keep in mind the board works perfectly otherwise, so I am wondering WHY it would only affect USB for this one peripheral and not for the keyboard and mouse? Maybe the circuitry on the keyboard/mouse is more tolerant to low voltage? Would appreciate your thoughts please.

Topic by edy   |  last reply


Low cost water heater

I wish to build a simple, afordable, low cost, solar water heater that is easy to construct and does not need electricity. Is that possible?

Question by rseni   |  last reply


Low voltage on Supercaps is a pain.

So, back when All Elecronics had them, I bought 100 of the 1F cooper (relatively high current) supercaps (2.5V), and likewise 100 of the Polyacene "batteries" that Electronics Goldmine is selling (0.6F, 3V, 20ohm.) But I've found the low voltages much more inhibiting than I thought it would be in actually using these. Have people managed to find good uses for these despite the low voltages?

Topic by westfw   |  last reply


Low AC to DC conversion

Hi, I'm looking for simple way to convert a low AC into a usable DC, of say 4 - 5 volts for charging batteries. I recently saw one discussed online, specced at costing about a quarter, but couldn't find a way to do it, or a way to purchase something like that. Thanks!

Topic by fafnir665   |  last reply


Robotic pet (low budget)? Answered

Hiyas I am longing loads for pet of my own since my bunny died. but i am not allowed another pet. does anybody have any ideas of how to make a *loving* pet????       thanks p.s this is my first ever comment on instructables!!!!! pp.s needs to be low budget (eg. under $100)

Question by juicymoose   |  last reply


Railgun, High or Low voltage? Answered

Okay so i'm making a railgun, and need to get capacitors. Should i go with the ones in the 300-400 volts range, or somewhere around 15-50 volts? I would rather go low-voltage, as they seem to be alot cheaper.  Also, how would I go about making a charging circuit, schematics would be nice.

Question by LiquidLightning   |  last reply


Low cost PCB service !

Just had a flyer through from these guys http://ragworm.eu/ VERY low cost PCB making - around 6 USD/sq inch for double sided plated holes -  and they have very liberal design rules, so they'll cut boards to weird shapes too Looks like free UK shipping, I don't see what they are saying about international orders.  Steve

Topic by steveastrouk   |  last reply


Web Repair - Low Rates

Back in 1998 Nina Katchadourian spent a number of weeks repairing broken spiderwebs with red thread. Interestingly, the spiders would reject the thread over the course of the night and repair it themselves by morning. Definitely check out her work.

Topic by randofo   |  last reply


Low voltage Push Solenoid

Hey everyone... I've been trying to find a DC push solenoid powered by 12V or less (I think 9V would be best). It needs to be able to push down on point and shoot camera trigger so I'm estimating about a half pound push minimum. I saw some time lapse modifications on the Make: photo pool. I'm going to do the same, but with simplicity in mind :P

Topic by trebuchet03   |  last reply


Low-tech fireworks in China

Out in Naunquan, China the villagers use molten iron to celebrate instead of fireworks. The tradition dates back some 500 years when the blacksmiths of the day couldn't afford fireworks and did this instead. While there's only one color to work with, the effect is pretty stunning and a lot more in-your-face without, you know, melting your face off if you don't get too close.via Gizmodo

Topic by fungus amungus   |  last reply


Do you know low carbon living ?

As the subject saying, do you know what is low carbon living ?

Topic by bella2009111   |  last reply


Low hot water pressure

I the past 4 months I have replaced the water heater, water softener, and the pressure tank. Everything was working fine until I developed a leak in a PVC elbow from the outside water supply As soon as that was replaced and I turned the wter supply back on my hot water pressure dropped to almost nothing in all of the faucets. I am thinking some scale got lodged in the outflow pipe from the water heater and I need to apply high pressure air from one of the faucets to force this out.

Question by    |  last reply


New Low-piece Crossbow

I was building crossbows all over the place this weekend, at one moment I had one that was twice as large as the Reaper, but I lacked pieces to make it sturdy. This started out as a low amount of pieces Reaper, but I eventually made it a small crossbow which has about 80-95% of the Reapers power. Although it has the power and probably also the distance, it doesn't have a double arrow trigger(only one arrow) and I don't think it is able to fire properly without trigger. It is however, compared to the Reaper very practical, light and easy to fire/load. Btw there are 4x3 rubberbands on it in pictures. I don't know if I am going to post this one though, maybe if its really needed :P

Topic by Wicky   |  last reply


low voltage lighting problem

SkidMark2, or anyone who can help, I have a Portfolio 120 Watt Power Pack with 6 LED lights.  I don't know their wattage, but the power pack, lights and supply cord all came as a kit, so I'm sure they don't require more power than the pack can supply.  I'm NOT getting the E1 error message.  My problem is that the lights don't come on when turned on.  The power pack is set to "O" for switching on or off manually, but the house's light switch usually has to be flipped once or twice to get them to come on.  I've got both light sensors covered, so they should be sensing darkness and allow the lights to come on.  Any idea how to fix this so that turning the switch on once turns the lights on???

Topic by KenKlos   |  last reply


low power razor scooter

So I was riding my small razor scooter to school (the kinds that fold up and fit in a backpack) and thought "it would be really cool to make this thing run with a motor." After I got home, I looked at it and thought of a way to make it work. If you put a small rubber piece on the end of the motor and lay that against the wheel right behind the break with some pressure, you could probably make it go pretty fast. The thing I was wondering is what is the smallest motor I could use and still have it work at about the same speed as me pushing with my foot on the road? 50 watts or so? I only weigh 125 pounds and would like it to work with 150.any suggestions? I would like to not have to use a car battery, with all the balance issues and such.

Topic by trenzalorian   |  last reply


Good quality , Low price!!!

I am a manufacturer and exporter of stainless steel pipe.Our main products include Stainless Steel Pipe Fittings, Stainless Steel Liquid Transport Pipe,Stainless Steel Structure Pipe , Stainless Steel Sanitary Pipe(Involve The Aquatic Products Pipe), Stainless Steel Boiler And Hot Permutater Pipe,Stainless Steel Flange And Stainless Steel Valve etc. Our products have acquired the license regarding the anitation and safety of drinking water by the Department of Health of Zhejiang Province and passed the accreditation of ISO9001:2000 International Quality Management System by CCS.Company Name: ZHEJIANG NANBO STEEL INDUSTRYCO.,LTD. Add:lndustrial Zone,Qiyi Village,Lanjin Bridge,Shacheng Town,Longwan District,Wenzhou CityTel:+86-0577-86997866 86051988 86058799 Fax:+86-0577-86050988Contact:RichardZip code:325025Web Site: http://www.stainlesssteelpipe.net E-mail: trade@stainlesssteelpipe.net

Topic by stainlesssteelpipe 


Low Powered Air Conditioner

I live in a converted bus made into a mobile home in Outback Australia. I'm currently building a 'Solar System'  so I can go anywhere without relying on hooking up to mains power. The biggest problem I'm having is finding an 'Inverter' that will handle power consumption to run my 'Fridge' and ''Air Conditioner', I have a 2500w Inverter but this can only run an 'Aircon' up to 300w, so tell me where you can get one that runs at this power level !! I have an idea that may get over both problems (Fridge and Aircon). I was looking through 'ebay' and found a 80L Fridge/Freezer that runs on 12v, mainly used for 4WDs and RVs. I'm just wondering if I could somehow carefully drill a hole into the freezer cabinet and coil copper or aluminum small bore pipe around the internal walls of this, then have a small 12v DC Pump circulating 'Antifreeze' or similar through a external radiator with fan blowing through this into my living area. I know this will be a drain on batteries as the freezer will be constantly running due to the warmer return fluid circling around inside the cabinet, but I'm not really worried about this as I will have 4 Solar Panels totaling around 500w production at 7-8amps and  4 Deep Cycle Batteries rated at 100ah each, total 400ah. Will this setup be efficient as a air cooling system without effecting the frozen food in my freezer too much. Would love to here any comments on this and also any suggestions will be gratefully accepted. Regards Keith

Question by Keefe   |  last reply


I'd like to build a 3rd order low pass filter, cutoff ~40mhz, impedence at 28mhz of 50Ohms?

Hello All. I want to build a 3rd order low pass filter with a cutoff ~40mhz. I'd like to build this in a metal box seperated into two compartments with a pi filter in each. What components do I need? The input output impedence should be ~50 ohms at 28mhz. It stray capacitence a problem? Thanks?

Question by microcal   |  last reply


Anyone have any high-quality machining techniques that can be used in a low-tech situation? Answered

I want to make a CNC machine but I don't have the tools or access to tools that I'd like to make one,  all I have is a simple drill press, a little stand-alone vice that I can use on it, calipers, and micrometers. What I want to know is how can I, limited tools only (I hope), precisely drill (and possibly tap, I do have a tap set) a bunch of holes in aluminium angle/channel, acrylic, and MDF?

Question by The Ideanator   |  last reply



BLE on a chip to smartphone connection?

I'm trying to use the BLE option on my chip to talk to my smartphone. Any ideas or suggestions on how to go about this? Thanks!

Question by maddywantstocode   |  last reply


help needed

CAN ANYONE HELP ME. IM MAKING A CIRCUIT AND IT REQUIRES THE USE OF A 74LS13 SCHOTTKY, I DON'T HAVE ONE SO ARE THERE ANY ALTERNATES I CAN USE INSTEAD. ALL SURGESTIONS WELCOME

Topic by carl1234   |  last reply


Periscope

I'm looking for a gaget that will allow me too read book titles of prices on low shelves without crawling on all fours. Hey, I'm 74. I look rediculous in libraries and find it hard to get up. Some sort of a periscope might work, or a traveling low chair to scoot along on and handle to help get up.

Topic by Nina Holland   |  last reply


help with changing transformer output of 8.5VAC 1200mA to 9VDC 1000Ma.

Howdy folk,    The Problem; I need some experienced assistance with changing the output of a transformer from 8.5VAC @1200ma to 9VDC @1000ma. Thanks in advance for any & all assistance.    The Back Story; The left channel went out in my PC speakers, which is designed for 230VAC, I had to destroy the woofer case to get to the transformer, and discovered that it outputs 8.5VAC @1200ma. I have another set of PC speakers (different manufacturer) that takes US voltage (110v) and steps it down to 9VAC @1000ma. I must first plug that transformer into a 100watt 230>110 step down (because I'm currently in the Philippines) and I want to get at least one transformer out of the "equation". I would just buy another system set up for local voltage, but I'm on a fixed income (until I can return to the States) that prohibits this avenue. I CAN afford some small components, but that's about it. Thanks again for any help. -Z-

Topic by Zclip   |  last reply


Ultra low voltage buck converter

I want to step down voltage from a 1.2/1.5v battery to 0.05V. Any advice?

Topic by huzefa   |  last reply


LOW COST BATTERY for CELL phone

My old LG flip phone still has lots o' pics, contact info, etc. I don't wanna throw it out, but the battery no longer holds a charge. I'd like to recycle the old battery, but when plugged into a charger with no batt, the phone  will not turn on.   Why can't I power it up on the wal-wart transformer alone?  Do I really need to spend $40 on a battery just to access old pics n stuff? Is there some proprietary circuit in there that "says" to the phone "I'm here"  other than just plain old voltage? Although the old battery seems to work just well enough to access data as long as it's plugged in, I'd like to get rid of said battery in case it eventually leaks.

Topic by Toga_Dan   |  last reply


can anyone help me design a transformer for low voltages?

Can anyone help me design a step-up transformer where the input voltage is around 100 mV (AC) and to be converted around 2.5V (AC)?

Question by jeromekang   |  last reply


How to make a solar-powered garden fountain low maintenance by adding a float valve? Answered

I have a solar-powered garden fountain that I wish to make very low maintenance and not have to manually fill with water. How could I install a float valve setup in the fountain? Has anyone ever done this? Any ideas?

Question by arnold54   |  last reply


Help! My low voltage, outdoor lighting wont light up - transformer error codes?

I bought a Portfolio 300watt transformer for low voltage outdoor lighting and hooked up a 100' 12 gauge cable (outdoor rated lighting cable) to it. Then I hooked up 4 low voltage lights (12volt 20 watts each). I plugged the transformer in to a gfi outlet that I ran out from the house. And turned it on. The little display flashes "E" and then "1" . The instructions say that the E means that there is a fire hazard so check the circut. So I unhooked every light except one. Same error. I hooked on a different light and unhooked the first one. Same error. Instructions say the cable needs to be under 250'. And the load less than 300w. I am there, except it won't run. Do I have a bad transformer or is there something that I am missing? Oh, and this is to light my haunt in my front yard, so I am running out of time! Thanks for any advice! Matt

Topic by mckeephoto   |  last reply


How do i build a super cooler? Answered

Hello.    I am looking for ways to turn cool down oxygen to -253C.    Can i do this using house hold materials (Maybe, building a refrigerator that can reach extremely low temperatures)?    How do i do this?

Question by jamesc4   |  last reply


I need low power relays.

I've been buying low power relays at RadioShack, but I bought them all. I need more relays and don't want to wait for RadioShack to restock. I need relays similar to this one http://www.radioshack.com/product/index.jsp?productId=2062478 sold on Digi-Key. The relays have to be low power enough to work directly off of an Arduino.Thanks!

Question by gregr   |  last reply