Geiger Pulsating Indicator (CB23617E)

This circuit is a suggestion from a Radio Electronics from October 1964. We found it in the patent section.

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Connecting the Telephone Line to a Sound Equipment (CB16970E)
This adapter circuit was found in a 1990 documentation. It is possible to connect a telephone line...
PLL AM receiver (CB8633E)
This receiver circuit was found in a Hands On Electronics from the 90s. The circuit uses a PLL...
Dual Power Supply with 9 V Battery (CB1344E )
The operational amplifier of this low current source may be any of the JFET type. The output...