The integrated circuit used in this trigger is uncommon today. We found it in a documentation from the 70s. The circuit operates with signals up to 50 kHz.
This audio millivoltmeter was found in a 1992 publication. It can still be assembled, as the...
This configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
IDT ZSSC3230 Capacitive Sensor Signal Conditioner Available from Mouser Electronics stock, this IDT...