Electrical Engineering Asked by ato on January 6, 2022
I like to trigger a LF398 Sample-and-Hold IC via a 3.5mm Jack (modular synthesizer). The desired behaviour would be:
This is the way the circuit looks right now:
The sections of the circuit are described below. The simulation pictured can be found here.
Is there any way I can reach the goal without adding too many parts or increasing complexity? Can I switch a signal path just by this switching jack?
Maybe if I exchange the switching jack with a stereo jack and add something on the ring that switches high as it is pulled to ground?
Edit: lifting ground at D8 and R20 would work, but how do I switch it the way I want?
One solution would be to replace the PJ301M-12 with a stereo jack and use the second contact to pull a NPN transistor's base to ground once a cable is plugged in and add offset if nothing is plugged in: Click here fore the simulation
This solution has the obvious downsides:
Answered by ato on January 6, 2022
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