Hi I am looking for a replacement for a BF494. I have searched the web and I believe a 2n222 would work. Thank you! I am making an FM radio receiver by the way the schem. is up above.
Topic by ethanl2 3 years ago | last reply 3 years ago
Okay... so long story short, i have this little transistor that i need the non-surface mounted version of. The part # is PHD3055E. I can only find the datasheet, And can't find it anywhere for sale. So i thought i'd come here and ask, Any ideas on what could replace this? Here's the datasheet in the google docs viewer. http://docs.google.com/viewer?a=v&q;=cache:huahl6K3DFkJ:www.datasheetcatalog.org/datasheet/philips/PHP_PHD3055E-06.pdf+PHD3055E&hl;=en≷=us&pid;=bl&srcid;=ADGEESg3724yaKjv666t2rqjyyXVjvQp5HpfKIXr3723cJt4Y_bqPXypg_oySVo3Q9eOgiMBHIG4zDYsHVk73N0whYfHI3PTtv8kTeA_FzIxSWhNnkzgniEWSIQLls8aeQVgmyBDhZyI&sig;=AHIEtbRm4XdPQEc-wzTiPkqsGwSO1qblnA
Question by ReCreate 8 years ago
I have a small model battery charger which has a resistor burnt out . output is 7.5 volts according to the label which sounds right as pack is 7.4volts. measured voltage from transformer is 15 volts Can anyone tel me what value resistor I need to drop the voltage to 7,5 v or whatever the actual out put shoul be. thanks people, john mantova
Topic by john mantova 5 years ago | last reply 4 years ago
I have an Asus M3A79-T Deluxe motherboard I recovered, and one of the capacitors looks to be ripped out of place. Does anyone know where I can buy or find the correct replacement capacitor? I have identified which capacitor it is I just am lost on as to where I can get another one. It has this on the capacitor: Some obscure F in between two lines 89He 101 16
Question by XP1 5 years ago | last reply 4 years ago
Hi everyone,I just want to know if there's anything that could replace a step-down transformer i.e,Step down 220 volts(AC) to 5 volts(DC).I want a thumb nail sized transformer for my purpose but its hard to get,so if there;s something more compact and can replace the transformer,things would move on awesome!
Question by Adarsh_tronix 6 years ago | last reply 6 years ago
It it possible to use simple components, arranged properly, in order to replicate the use of a simple IC, such as the 555 or LM386? If so, where could I find diagrams of the internal electronics? Google has turned up nothing so far... Thanks!
Topic by jeffconnelly 6 years ago | last reply 6 years ago
Hi, So I have a AA battery pack inverter for some EL wire, and I was wondering if it was possible to replace the AA battery's with a lithium Ion battery to reduce its size. What kind of voltage should I look for/do I need to take into account amperage?
Topic by Fozzibehr 5 years ago | last reply 5 years ago
Apparently Microsoft has found that Vista was a bad idea and so is producing a replacement which is said to be coming out in 2009.So if we put in Microsoft's usual lateness with release it will be 2010 before anything appears.Edit: Its called Windows 7 and wikipedia has an article on it.http://en.wikipedia.org/wiki/Windows_7
Topic by davidturner666 10 years ago | last reply 10 years ago
My AC Return/Supply is in my garage and appears to have some cheesy work done by the construction workers when they installed it, keep in mind this house is 10+ years old. I was hoping to replace and re-install some new drywall and was hoping for some recommendations on how to approach this situation. See photos for details.
Topic by bprins 5 years ago | last reply 5 years ago
Hello, I have a old hair clipper. It has a rechargeable battery in it, which does not charge very well. I opened up the clipper and it has a single battery. It reads d-2/3a700 mAh 2.4 v. What do I need to do to replace with a capacitor? Like resistors and such. If I wanted to get it to charge quick. And use it quick. thanks
Topic by gregdove 4 years ago | last reply 4 years ago
Well, got an old Dell Inspiron 8600 and if you've read any of my other questions you know all about it and its problems. Anyway... the cover for the point stick (mouse thing in the center of the keyboard) needs to be replaced, but this being my first laptop, I'm not quite sure how to do it. Personally I just want to pull it off with a some pliers and jam a new one on, but I don't want to break it either.... so I'm exercising alittle caution by asking first.... is there a specific way to do it, or is my way just about right? Thanks
Question by transistorguy 8 years ago | last reply 8 years ago
There is a potentiometer on my $500+ vintage guitar pedal that i recently broke off. Any suggestions to glueing it or figuring out a way to put it back on? The knob is the only part that is off and i still have the knob.
Question by octopuscabbage 9 years ago | last reply 9 years ago
. I was wondering if anyone knows a supplier for a FFC converter/adapter so I can replace a viao laptop LCD with an HP one I have on hand? I'm trying to use on hand parts to build a diy lcd projector, and thee vaio lcd has serious issues that reduce it's usable screen real estate, IE, dead pixels, lines running top to bottom... The HP just has a broken backlight, but it's motherboard is trashed.
Question by JCO72 9 years ago
I won a mouse on ebay for $0.01. now i am annoyed with the red led due to the mouse transparency. i want to know if i can swap the red led with an infrared led just to get rid of the red light and still has the same performance By the way. there was another blue led in it that i chopped out without hesitation.
Question by ARJOON 7 years ago | last reply 7 years ago
Hi, I have what can only be described as a "no-name" laptop sitting in the bottom of a drawer. Among other things it has a missing "G" key. The problem is I have absolutely no clue how to replace the key - I'm not going to pay for a whole new keyboard and the key + "springy bit" is long since gone. The only branding I can find is "Clevo M300N". I was hoping to buy a broken laptop and cannibalise it (there are other hardware issues, but the keyboard is driving me nuts) Can anyone give me a shove in the right direction here? (Sorry for rambling) Edit: UPDATE - I found the key, all I need now is some kind of spring or membrane to fix it right up!
Topic by voltagex 11 years ago | last reply 6 years ago
Do you think it would be possible to substitute a variable resistor and a normal capacitor for a variable capacitor? The way I figure it is that a variable capacitor is supposed to adjust how fast said capacitor charges and discharges, wouldn't a variable resistor and a normal capacitor also function like this? I'm working on an idea for a small am radio, and looking to substitute these parts. Could it work? Thanks
Question by transistorguy 6 years ago | last reply 6 years ago
So i made a laser alarm system some time back, it worked good but had one fault, more like a limitation. it made the buzzer ''buzz'' only when the laser was interrupted and the buzzer turned off when the laser was allowed to hit the photo sensor again. i wanted it to stay on until turned off by a switch. someone suggested something called a monostable flip flop but i had no idea what it even meant, then i saw something called silicon controlled rectifier or a thyristor, but i also learned that they have to be made using a pnp and npn transistor, what i cant understand is what transistors should i use to replace the npn transistor on my circuit, the tansistor on my cicuit is 2n3904, input voltage is 5v
Question by walee 1 year ago | last reply 1 year ago
Hey I have a cheap camcorder that runs on AA's but I want to put it on a lithium battery. What I want to use is just the standard battery out of an old phone 3.2v, I'd like to use these because I have a huge surplus of them. I have pretty much no knowledge of electrical circuits and so I need of bit of help. I know two AA's is 3v and any lithium battery is 3.2v, how could I step the battery down to 3v?
Topic by problems 8 years ago | last reply 8 years ago
The situation:I (will) have a disc of plywood roughly 20cm across. I need to cut a spiral notch in the ply, from edge to centre, around 3mm wide, so that I can hold a spiral of flexible ply in place and close off the end of the spiral at the same time.The perfect tool for the job is, of course, a router.The problem:I don't have a router.Short of buying a router just for this one job, what can I do to cut the notch?Plus:I've been saying "plywood" - is there another material that can be shaped the same way?
Topic by Kiteman 11 years ago | last reply 11 years ago
I have a 2006 Mini Baja Minibike(http://www.bajamotorsports.com/categories/minibikes/products/WR65_baja-warrior-mini-bike) with more than a few problems. As of now, it won't even start, and I can't find the problem. I've cleaned anywhere that fuel goes, air filter, exhaust, and adjusted the carb, it still doesn't start. When it was running, it didn't even idle. So I'm wondering, would an engine swap with this: http://www.harborfreight.com/engines-generators/gas-engines/212-cc-ohv-horizontal-shaft-gas-engine-epa-69730.html engine work? It seems almost identical; but I"m not sure.
Question by The Dark Lord 6 years ago | last reply 6 years ago
Sorry earlier i posted reverse of that...i saw a video on utube a man producing magnetic flux from dc current (conveted to AC with help of dc motor)..how that can be done What i want to stay is you hava a 9v battery a 5v dc motor and a capacitor ow can u produce magnetic flux? without doing any implicit changes i mean disturbing the motors etc etc(internally)
Question by jatinbatra 6 years ago | last reply 6 years ago
I decided to make a comfort handle for my TNKIT round 2 entry, but I don't have any of those black wheels. I discovered you could do the same thing with green/black knex knobs. I have about 5 of these, and they make really comfy handles.
Topic by DJ Radio 9 years ago | last reply 9 years ago
Hello, i was just messing with circuits and i found this one above in the image i really want to make this but i don't have a BF494 transistor so my question is : Is it possible to replace this transistor with any other transistor if possible please name all possible replacement you know!
Question by ubdussamad 5 years ago | last reply 7 months ago
Chicago Electric Power Tools 7" orbital sander, model number:92623. I need to replace the variable speed switch?
Question by joe dejesus 10 years ago | last reply 10 years ago
I got my laptop with a dead battery and I got my laptop from a liquidation sale, now my laptop use one of those battery packs that have a bunch of batteries the size of a AA. Their total voltage is around 14.4v as the battery pack says so, meaning each of the 8 batteries is about 1.8v. The batteries are lithium ion ones but I want to know if it would work to make a battery pack of my own out of alkaline batteries? I got a whole bunch from disposable cameras and want to use them. Now besides that the power adapter says it outputs 18.5v. So which one should I follow when making the battery pack? I will be hooking the alternative battery pack to the contacts the dead battery was so I guess I should make a battery pack around 14.4v. Any comments? Would this work?
Question by Ideal_Ideas91 9 years ago | last reply 9 years ago
Hello, My wife accidentally crashed her phone digitizer (Samsung Galaxy Core 2 (G355H)). Its was still working, but you know... Being the type of man which always desire to fix something - I put myself to that mission. So I bought a new digitizer from one of eBay sellers. And sadly after replacing... the new digitizer was not working at all. Bringing back the old crashed digitizer to test it - it was still working. Tried to update firmware. Still the same. So I decided that It was faulty and asked for seller to resend the item. The new digitizer (number 2) came. Still the same stuff :(. Started to google. Found the solution on the internet. I have to let the phone boot with the old digitizer, when the boot is complete, need to remove the lcd and digitizer, replaced with the new digitizer (the phone has to stay on). And after that connected back the lcd... and its works... but sadly (as the author of this solution) if I reboot the phone - will not work again. PLEASE... Show me the direction what I need to do or where to search the answer
Topic by VadimL3 3 years ago | last reply 3 years ago
Frame construction Florida house with 32" overhangs. New roof in 2006, dry rot in facia, and soffit. what goes back on 1st ? Should I use vinyl soffit panels?
Question by jbaumberger 9 years ago
I want to replace hte headers because I dropped it and the header broke on onalog pin 5 exposing the metal that catches the pin from a shield.
Question by nerd7473 5 years ago | last reply 2 years ago
Question by mishap91 10 years ago | last reply 10 years ago
Frame construction Florida house with 32" overhangs. New roof in 2006 but dry rot in fascia and soffit(entire house needs done). After deconstruction what goes back up first? Should I use vinyl or aluminum soffit panels instead of wood?
Question by jbaumberger 9 years ago | last reply 9 years ago
I am trying to purchase a replacement for my RC vehicle (TAMIYA RARE XB MERCEDES BENZ CLK-DTM 2000 RC RACE CAR). I wouldnt want to just purchase one from amazon as i dont know if it will work or not. Can i get a suggestion if there is a cheap one that could work and cost not above $50. Thanks
Question by ThlamaU 3 years ago
Recently one of the plastic clips that connect the strap to the mask for my CPAP machine broke. They sell replacement clips for the heargear ( 8 bucks for 2 clips). My question is would it be cost effective to get replacement clips 3D printed, or am I better off just buying the replacement clips?
Question by Lorddrake 2 years ago | last reply 2 years ago
Does anybody know an inexpensive way to replace the surface foil on an electric razor? I think it's called foil anyway; it's the metal part that contacts the skin and is a mesh of small holes for beard hair to pass through. The raw foil stock must be relatively cheap to fabricate; maybe there is a way to get a sheet of it and put it on the original frame from the shaver. Most replacements are almost the price of a whole new shaver. And I haven't even found a replacement for my modified, ancient Braun system 123. After the shaver died I resurrected it and made it solar powered by tearing out the charge circuitry and batteries and replacing them with two batteries and a diode that plugs into a small solar panel from a garden light. This worked perfectly for years until the foil wore through last week.
Question by snotty 8 years ago | last reply 8 years ago
I have these old but in great shape head phones but the foam is kind of wearing out. I was wondering does any one has an idea as to what to use to replace those foam covers for headphones? Since those foam replacement covers are no where to be found here. Thanks.
Topic by Treasure Tabby 9 years ago | last reply 9 years ago
One day I brought my Arduino with the MakerShield to show it to some of my more "electronically-apt" friends. However, my other friends took it, (somehow) thought it was a BopIt, and started screwing around with it. Before I could do anything about it, they ripped off the potentiometer. I was wondering where I could find a replacement potentiometer.
Question by TheWaddleWaaddle 7 years ago | last reply 7 years ago
Along with other minor changes to my bicycle, I really (really) want to turn my bike into a tricycle. I figure having one front wheel and two back wheels would be the best (and by best, I mean simplest) arrangement. I'm also guessing that it would be fairly easy and perhaps weld-free. I want to get metal tubing/a metal rod that is the same size as my back axle, have it be about 4 feet long, and place two wheels on either side. The gears would be located in the same spot they were, just attached to the axle and not the wheel. I don't know how thick my axle is, but I can figure that out - the problem is, will the axle hold my weight? I plan on also loading some cargo (add, say, 50 pounds). I don't think the cost would be too much (over $50?) and should I need to weld something, my brother might still be able to do it. Do y'all think this would work? Would the axle hold 250 pounds of weight? If so, the axle could be threaded on the ends so as to keep the wheels in place, right? Thanks!
Topic by Bran 11 years ago | last reply 10 years ago