250 V Preamp (CB21792E)

Indicated to operate in tube circuits, this preamplifier has 250 V power supply. The circuit is from a Mullard transistors manual from 1960.

13.8 V x 5 A Power Supply (CB1216E)
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
Remote control receiver 2 (CB20469E)
This receiver can operate with the transmitters shown in previous articles and even others...
Car Voltage Regulator (CB12090E)
We got this circuit in an old 1983 publication, but it can be fitted with equivalent transistors. For Q1...