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2000-04-17 by jmw
Sorry for the OT post: I need to make a circuit that will take an audio click and give me a flashing led*. I imagine that it's some kind of amplifier but beyond that I'm lost. Hopefully this will be fairly simple. Considering how much everyone loves LED's on this list I figured that this would be a good place to start. peace, John W *preferably something that will fit into a small project box and run on battery power
2000-04-17 by Dave Bradley
I whipped this up real fast, it should work if your input click audio is a volt or more. If not you may need additional amplification on the input. A comparator turns the audio into a pulse, which turns on the transistor to power the led. Needs 5V to power the circuit, you could probably get away with a wall wart transformer and a cheapo 7815 3 terminal regulator for the power supply. I'm afraid a battery wouldn't last for the entire gig. Moe
> I need to make a circuit that will take an audio click and give me a > flashing led*. I imagine that it's some kind of amplifier but beyond that > I'm lost. Hopefully this will be fairly simple. > > Considering how much everyone loves LED's on this list I figured that this > would be a good place to start. > > peace, > > John W > > *preferably something that will fit into a small project box and run on > battery power >
2000-04-17 by Dave Bradley
One other thing - if the click is super short in duration, you'd need to stretch the input pulse, which would make it more complicated... Dave Bradley Principal Software Engineer Engineering Animation, Inc. daveb@...
> -----Original Message----- > From: Dave Bradley [mailto:daveb@...] > Sent: Monday, April 17, 2000 10:13 AM > To: motm@egroups.com > Subject: RE: [motm] OT: newbie needs a clue w/ circuit design.... > > > I whipped this up real fast, it should work if your input click > audio is a volt or more. If not you may need additional > amplification on the input. A comparator turns the audio into a > pulse, which turns on the transistor to power the led. Needs 5V > to power the circuit, you could probably get away with a wall > wart transformer and a cheapo 7815 3 terminal regulator for the > power supply. I'm afraid a battery wouldn't last for the entire gig. > > Moe > > > I need to make a circuit that will take an audio click and give me a > > flashing led*. I imagine that it's some kind of amplifier but > beyond that > > I'm lost. Hopefully this will be fairly simple. > > > > Considering how much everyone loves LED's on this list I > figured that this > > would be a good place to start. > > > > peace, > > > > John W > > > > *preferably something that will fit into a small project box and run on > > battery power > > >