This circuit was found in the June 1995 Electroics Now magazine. The relay should be a sensitive type with up to 100 mA trigger current.
Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the...
This is the simplest function that triggers the load if the level of the input signal is 1. In...
This non-inverting AC amplifier was found in the February 1990 issue of Radio Electronics...