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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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bugbrand
Joined: Nov 27, 2005 Posts: 846 Location: Bristol, UK
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Posted: Tue Oct 24, 2006 1:52 am Post subject:
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If you have a check of some of Ken Stone's modules such as the Gate Seq he uses LM358s to condition the clock and reset inputs --- this is a very useful little circuit and should be fine to work (maybe with a few little value changes) on 5v supply I'd have thought..
Actually -- he's got a dedicated Gate to Trigger module _________________ http://www.bugbrand.co.uk
http://www.bugbrand.blogspot.com |
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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zipzap
Joined: Nov 22, 2005 Posts: 559 Location: germany
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Posted: Thu Nov 02, 2006 3:22 pm Post subject:
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Hi. Think it should work. Actually, what turns the gate to the trigger is the cab and the resistor at the beginning. Remember, the cab only lets ac pass. The gate is DC. Except for the very first moment - when it changes from 0 to whatever (eg 5v). That little step "passes" the cab. In this case to fire the comparator-opamp. Could also use a cmos gate. _________________ http://www.myspace.com/lorolocoacousticpop
http://www.myspace.com/petrolvendor
music and transcribed jazz basslines |
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Posted: Fri Nov 03, 2006 4:37 am Post subject:
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zipzap wrote: | Hi. Think it should work. Actually, what turns the gate to the trigger is the cab and the resistor at the beginning. Remember, the cab only lets ac pass. The gate is DC. Except for the very first moment - when it changes from 0 to whatever (eg 5v). That little step "passes" the cab. In this case to fire the comparator-opamp. Could also use a cmos gate. |
Aha! of course! Now I see Does the cap react when the gate goes low too? and lets that through? _________________ YouTube channel
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zipzap
Joined: Nov 22, 2005 Posts: 559 Location: germany
Audio files: 24
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Posted: Fri Nov 03, 2006 5:25 am Post subject:
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Tell me if i´m wrong, but i say no because
The 100k resistor on the right of the cab, by the opamp, will pull the right side of the cab, and the opamps input, low. So all you get is a short burst of positive voltage, just enough to fire the comparator. Little enough for the resistors to quickly discharge the whole thing, making the comp jump back again.
If the gate does not go low to 0v, but say to -5v (eg when it comes from an lfo) the diode will jump in. otherwise you would get a second negative pulse. _________________ http://www.myspace.com/lorolocoacousticpop
http://www.myspace.com/petrolvendor
music and transcribed jazz basslines |
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