I like to trigger a LF398 Sample-and-Hold IC via a 3.5mm Jack (modular synthesizer). The desired behaviour would be:
- if a cable is plugged in, incoming signals will be converted to short triggers.
- if no cable is plugged in, the LF398 should sample all the time (the trigger part should be essentially bypassed)
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?