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Registered Member #1940
Joined: Tue Jan 27 2009, 02:34PM
Location: Netherlands
Posts: 34
It works! But not according to my specification. It still has a lot of disturbance. I will figure that out later. There is a more important problem. There is always a spark. The audio signal turns the spark off and on. No signal means that the spark is on. It should be the other way around. No audio signal, no spark. Can I achieve this by putting wire 2 to pin 3 (and wire 3 to pin 2)?
I was wandering. If I can’t solve the disturbance problem, then there is an option. Maybe it is time to separate the 2 power supplies by placing an opto coupler on the 3 pin of the 555 chip. It will run on max 100 kHz. I assume that this is no problem for an opto coupler?
Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
I hope this is never too late :) invert the signal going to the RESET pin of 555 with a transistor...
just picture this out cuz I have no picture editing software installed in this pc... Emitter of NPN to gnd..Collector to 4k7 resistor then other end of resistor to V+. base of transistor with 1k connect to output of comparator... now the point where Collector and 4k7 resistor connect, tap it out to the pin4(reset) of 555... that is an inverter :)
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Myke wrote ... You might want to have a fairly large resistor go from the non-inverting input to ground so that the voltage doesn't drift anywhere on the other side. Maybe something around 100k.
Franky, I think you missed the point. The 100K resistor to GND should be on the right side of the input coupling capacitor, otherwise the DC voltage on LM311 input pin is not well defined. (although clearly the circuit you drew does work).
Is your V- power pin connected to audio input ground, same as the other LM311 input pin? That's also not proper practice, because LM311 performance is not specified with input voltages as low as the negative power supply.
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