This circuit uses a transistor to trigger the alarm from a low quiescent current sensor. The relay is 12 V. The circuit is from Radio Electronics magazine, April 1975.
The characteristics of this amplifier that does not require a symmetrical source are given in the...
The MC1556 integrated circuit is an operational amplifier from Motorola. The circuit is from a...
This circuit is for collectors. It is the circuit of one of the most popular transistor radios of the...