6VDC Amplifier (T485E)

This drum amplifier was found in an American documentation from 1947. It makes use of a mechanical vibrator to generate high voltage for the tubes.

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Digital Timer (CB26205E)
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
5 to 3 V switching regulator (CB8169E)
Found in a publication by National Semiconductor, this circuit provides an output voltage of 3.3...
Pulse inverter (CB7256E)
This circuit was found in a 1968 EEE and can be implemented with any current general-purpose transistor....