Latest threads in Hobby Electronics Basicsshow only best voted threads
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Why Did This Battery Recharge?
My son's truck battery ran down, and I tried starting the truck by jumping my 600W powerpack across it. I heard the click-click of the engine trying to turn over, but no luck, so I decided to leave...
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15 years ago
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Dram chips
I have some older circuits (from the '80) that I would like to build. The logic chips are still available. I have one that uses 8-4164 drams and one that uses 2-41464 drams. I can expand the ram the...
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15 years ago
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puzzling grounded input
In this circuit: Why is the other end of RV1 grounded? Thanks, Michael
9
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15 years ago
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Low resistance
I need to measure the resistance of some motorcycle alternator coils They should be about 1.5ohm I have a cheap DVM, which is of little use at this value Is there a simple way to do this keeping in...
5
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15 years ago
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Norton Resistance question
Can someone tell me (step by step) how to calculate the Norton's resistance for this circuit? (see picture below) Thanks! Lee
8
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15 years ago
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data communication
When the average amplitude is non zero then the problem arises is ______________????
7
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15 years ago
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Optocoupler puzzle
I dug an old 4N35 out of the junk box, and wired it up two ways (below). I put ~150us pulses on pin 2, and expected to see something similar at the output. What I get is a scope waveform that slowly...
5
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15 years ago
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Does anyone know a way to take an audio signal and output it multiple times with different amplitude and phases tia sal2
Does anyone know a way to take an audio signal and output it multiple times with different amplitude and phases tia sal2 Greetings All I have one source for an audio signal and would like to send it...
41
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15 years ago
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41 | |
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Voltage sensing switch with deadband ideas?
I need to maintain pressure on a hydraulic system within a narrow +-3% band for some tests but the commercial precision pressure switches are way out of my budget . I have a 4-20ma pressure transducer...
4
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15 years ago
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4 | |
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Hopefully simple question about DC power supplies
Hi, I'm hoping that this is a simple question to answer. Although I'm not a technical ignoramus, I know very little about power or cabling, so I would like some advice with what I'm trying to do! What...
18
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15 years ago
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18 | |
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LED and constant current supplies
I've got a bit of a mystery. I've ordered a couple of these: along with a constant current supply: The only tidbit of information I can find is that you drive them with 300 ma @1.7V. I've asked a...
11
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15 years ago
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11 | |
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Two Column Selection Game
The non-profit org I belong to has a push-button match column A with B type of game for kids to play. The first column either shows about a half-dozen pictures of birds, snakes or insects and the...
4
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15 years ago
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Gold From Filter Feeders
Ingesting calcium from oyster shell suppliments is supposedly unhealthy from the high lead levels. Filter feeders concentrate the heavy metal in their shell. Now, to be sure, Pb is more reactive than...
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15 years ago
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29 | |
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Default reply to all
Nov10 2008,6.53AM
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15 years ago
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On/Off switch with a difference
Hi all, I have a machine that I'd like it to turn the coolant system off when it has finished a job as it sprays crap everywhere on a stopped cutter. The cutting head always returns to a "home"...
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15 years ago
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