High impedance millivoltmeter (CB20611E)

We found this circuit in an old American documentation. The components are from that period and may present difficulties in obtaining them.

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Touch Switch (CB12007E)
A touch of the sensor makes the load bistable (load) connected in Q1. For a BC548, a 6 V or 12 V...
Asymmetric Astable 4093 (CB16089E)
With the use of an additional diode and a resistor, the configuration of the figure can be...
Proximity sensor (CB9570E)
This circuit was found in documentation from the 1980s. The circuit uses several components of the...