We found this circuit in the November 1975 issue of Radio Electronics magazine. It uses a digital module from the time with several adjustments. The power supply must have the indicated voltage.
This circuit is from Motorola's Linear Databook from 1990. The integrated circuit used is no...
The figure shows how to connect a relay to obtain the latch effect. The circuit is from an...
Suitable for the use with sensors, this circuit from National Semiconductor appears in other...