13W Amplifier (T486E)

This 5-tube hi-fi amplifier was found in an American publication from 1947; The output is in class B and the circuit uses a source with transformer.

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12-V Battery Charger (CB1579E )
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
8 Channel Encoder with 4017 (CB4530E)
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...
SCR Test Circuit (NI007E)
This circuit is used to test SCRs like the ones of TIC series. The simulation shows the power line...