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#5
04-12-2014, 06:23 PM
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Quote:
I have tried this circuit but I did not found I have no negative output pulse. Also I tried to add the little circuit output, and another signal generator but I did and there some negative pulse output. 
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#6
04-12-2014, 09:18 PM
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Remove diode connection ground.
Few years ago, i build it, but i don't remember  a small modification. My sense is diode.I search tomorrow my library, maybe i find it or a better and simple schematic best regards
__________________
crypton's designer
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#9
04-13-2014, 05:49 PM
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Parts List:
R1 = 100M, 1/2W, 5% R2 = 10K, 1/4W, 5% R3 = 5K, potentiometer (see text) C1 = 470pF, ceramic disc Led1 = Led, red, 5mm Q1,Q2 = PN2907 or NTE159M, try others like 2N2907 Q3 = PN2222 or NTE123AP, try others like 2N2222 M1 = 100mA, panel meter Additional Parts and Materials: Perfboard, plastic enclosure, 9-volt battery holder and connector, wire, solder, hardware, etc. R1 Note: We couldn't find a 100-mega-ohm resistor. We used (5) 20-mega-ohm resistors in SERIES to get 100-mega-ohms.
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No matter how the speed of light is high , Darkness is one step ahead .
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#10
04-13-2014, 06:06 PM
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Hi reza
Here is thread "Negative pulse generator" by fmnotes. If you need infos about other circuits-schematic is better open a new thread or go threads from your schematics About your last schematic , my answer is no! Best regards
__________________
crypton's designer
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