Latching relay (CB25722E)

The figure shows how to connect a relay to obtain the latch effect. The circuit is from an Electronics Now from June 1994.

Simple Voltage-Controlled Oscillator (VCO) Using the 4046 (CB110)
An application for the previous circuit (CB109) is shown here. The central frequency is determined by C and...
Negative Resistance with the 741 (CB13624E)
This circuit shows how to implement a negative resistance device with an operational amplifier. The...
Alarm with parallel sensors (CB26226E)
This simple alarm with SCR triggers a buzzer. It was found in the Encyclopedia of Electronic...