Found in an Electronic Design and 1970s, this circuit uses transistors of the time. The transistors can be replaced with equivalents and the relay is 12 V depending on the power supply.
The circuit shown in the figure is the version activated at the low level, of the previous circuit...
This circuit is from an old American documentation using LEDs in the rectification. The circuit...
This circuit consists of an emitter follower, presenting unit voltage gain implemented with an...