Mini no breake (CB22151E)

This circuit was found in old English documentation. When the main power is interrupted, the battery continues to supply the charging circuit.

1-Transistor Amplification Stage (CB19877E)
This stage with polarization of only one resistor can use any general-purpose transistor. The...
Optical potentiometer (CB22159E)
This voltage-controlled potentiometer using an LDR was found in an English documentation. LDR is...
Spy Detector (CB25214E)
This interesting sensor for RF signals was found in an article in the June 1989 Radio Electronics...