20W HiFi Amplifier (T496E)

Found in a 1947 publication, this 7-tube amplifier uses four tubes in the output stage. The circuit uses a power source with a transformer.

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Sine to Square Converter (CB6586E)
Found in American documentation this circuit uses transistors of the time. The circuit can be made...
1 W Amplifier (CB6295E)
The TAA300 integrated circuit is not common today. In fact, the circuit shown is from a Dutch...
Rain Alarm or Door Bell (CB5369E)
This circuit was found in a 1980s documentation. Q1 and Q2 can be BC548 and SCR a TIC106. The...