This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering an LED. Trigger adjustment is done in a trimpot.
The integrated circuit used in this 80's mixer is the LM301A. However the circuit can be used to...
This circuit, found in a 1982 documentation, consists of a small inverter based on a Hartley...
Found in Popular Electronics from the 90s, this circuit powers a warning lamp when the load is...