Bistable light relay (CB21708E)

This circuit was found in an internet documentation. The relay must have voltage according to the supply.

Simple 4011 Oscillator (CB16071E)
Three 4011 NAND gates and two more components - a resistor and a capacitor make this oscillator very...
High Gain Preamplfier (MSB023E)
A 25 mVpp applied to the input of this circuit produces in the output a 1 Vpp signal. The...
Extension Bell (CB15685E)
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...