Delayed Pulse Generator (CB6470E)

This circuit was found in a 1967 documentation. The switch diode is a component of the time and is difficult to find today.

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Ammeter (CB23646E)
In the figure we have the circuit of a multi-range ammeter using a 50 uA full-scale instrument. The...
455 kHz Generator with MOSFET (CB23991E)
We found this circuit in a Radio Electronics magazine from December 1969. The circuit uses a...
Audio Oscillator (CB22250E)
This blocking oscillator was found in a publication from the 50's. The coils determine the...