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ZomBiE
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Posts posted by ZomBiE
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Hi Zombie,
The peak current in the amplifiers is doubled with a 4 ohm load (compared to an 8 ohm load) and the current is doubled again when two amps are bridged. So the protection circuit in the LM3886 will drastically limit the power when bridged into a 4 ohm load.
Like i didn't know that??? -
You're on right tracks. You should start by checking wattage that laser of yours needs, 0-900 is not neccessary. but say 100-900 would do. Transformer where output voltage rises when open, 900v is target, would easily rise above 1200v and that might create an arc between windings. I used super-glue to create extra isolation when i tried such high-voltage projects for CCFL lamps that required 800-1250v operating. but wattage needed on output is most significant in this case. If you need a 100W toroid transformer, it wont work. Toroids in general doesn't have good enough isolation for this. PCB encapsulated transformers would be the best choice because those have quite good isolation voltage, about 5000v winding-winding.
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What's wrong with people? Now i have been repairing those good old computers because seems like anyone else can't do that here in Finland... What if those original logic IC's aren't available anymore? Always there's a substitute. Well, PLA IC's might be hard to find, but almost all the others can be found. Is there anything same-like problem anywhere else?
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I am using simple metalic probes for water level monitoring now.using AC will prevent electrolysis of probes.
What? Electrolysis? You mean electrolytic corrosion? No way, it always happen. You should use some good metal rods for this, like chrome-vanadium. like scrap screwdrivers. And low sense voltage, wich is amplified for desired level for your application. And i don't see any measuring circuit, that circuit is just a base for some audio peak detectors.
This might be something like you are looking for, for detector i mean?
http://www.electronics-lab.com/projects/sensors/027/index.html
There's an idea of water level detector, uses DC and no worry of corroding because of VERY low voltage and when using durable metal rods. -
This topic went off, again. But i remembered this, and thought that i'd put those plans online. BUT: When i searched my archives, i found that this particular CD-ROM was damaged. >:( I built my own amp and it has worked for about 3 years now, almost 24/7. It doesn't work well on 4ohm speakers but 8ohm speakers it ROCKS. ;D I built it like i said at start of this topic: 4 channels single-ended, 2 channels when switched to bridged. It uses 4 pcs. LM3886 IC's, 2 per channel when bridged.
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Found one not rail-rail. http://www.national.com/pf/LM/LM675.html
And another http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1028,P1329
Single rail to rail op-amp in single package (20SO Powerpad) http://focus.ti.com/docs/prod/folders/print/opa569.html 5V supply though. -
For what type of use? that might help a bit.
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Laser tranceiver itself doesn't need any special programs. It works like an ordinary nullmodem cable. S/PDIF transmitter could be done by using only few transistors and requires no IC's. Toy laser pointers is propably the best choice for testing these projects, because those are cheap and easy to get. Main problem might be slew rates of those cheap laser diodes and other electronics within. My old toy pointer worked flawlessly (3* LR44 cells) with direct 5 volts signal.
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Li-ion chargers might not like parallel power, them dent to "sniff" input voltage to vary PWM cycles for proper regulation. And when theres a few PWM regulators, it may cause too much noise that will mixup error amplifiers of such chargers to undetermined state. ie. charger doesn't work like it should be.
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We tested similar assembly in our school, and we came into conclusion that gyroscopes are the best solution for this application. Try to study a bit of inertia navigation and you understand why.
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there's tons of them, by single IC or via discrete components
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Reverse voltage spike might be too high?
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receiving photodiodes produces all you mentioned. But transmitter lasers, you'll have to ask matsuhita or sanyo
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20 meters. Yeah, small amount of hum, not disturbing though.
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start with the principles of building electronics... If you want a complete ups, this place isn't for you. If i can tell. Im sorry, but i think that no-one will help you to build a UPS from scratch for just a hobby.
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It works! I built one with about 20M simple phone-line cable from my garage to my grandpa's living-door without a single problem :D
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me want one too :D
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Normally the way a tac works is it measures the number of firings that occur on the main coil. The distributor cap then diverts each spark to a different sparkplug. So if there are 8 sparkplugs, divide the number of sparks by 8 and you have 1 rotation of the engine.
What? 2-stroke engine? In four-sroke, it needs 2 revs for cranckshaft for one firing spark in single cylinder. CAMSHAFT does only one rev while cranckshaft does two. in V-8 you must divide strokes by 4 if you want actual engine revs. -
Yeah, of course. But i think that we've been talkin about a laptop problem.
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Yeah... Me too, me too... I was lucky though, found a service manual for Gould OS300 by googleing it and there it was, at least i got my OS 300 working. But those other 2 1421's are still dim, only power light is on but no trace.
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Try this RS Stock No. 541-5801
It's almost same, but maybe you need to make an adaptor
because it has centronics 36male connector -
Many laptob batteries involve inbuilt memory wich is modified by the computer and/or by battery wich tells via battery "fuel gauge" that capacity left in battery, and that data sometimes may be corrupter/misinterpreted. In that case, that particular eeprom must be resetted.
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What's the frequency? (how many poles in magnet per turn * rpm) There are many types for many uses...
Dual LM3886 Bridged Amp.
in Electronic Projects Design/Ideas
Posted
What didn't you get? with 8 ohm speaker it works just as expected.