This circuit, to control air conditioning systems, was found in July 1984 Radio Electronics magazine. The circuit is for old types of the time that did not have microcontroller control.
This circuit connected to the input of a good amplifier, with suitable coils can tune stations of medium...
This circuit was obtained in an American documentation of 1975. The transistor can be the BC548, and...
The values of the components of this Mullard (Philips) circuit depend on the desired voltages. The...