100V Negative power supply (CB21182E)

This negative voltage source was found in a Popular Electronics from the 90's. The transformer has 120V secondary and 4-12V primary.

| Clique na imagem para ampliar |

Telegraph Practice Oscillator (CB4890E)
This traditional oscillator circuit that can be found elsewhere in this section uses general...
Tape preamplifier (CB20575E)
With NAB equalization we found this circuit in an English documentation from 1967. The transistors used...
Remote control tunnel transmitter (CB23885E)
This circuit was found in Radio Electronics magazine from June 1963. The range is small and the...