Electrometer with JFET (CB7351E)

We found this circuit in a 1964 Electronic Design. The components are from that time, but the circuit can be made with modern equivalent components.

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Dual-intensity LED (CB22128E)
This circuit switches the brightness of the LED. We found it in an English documentation....
Timed Photo-Electric Automation (CB13146E)
The circuit shown in the figure triggers a relay when S1 is pressed, but this only in the absence of...
Astable (CB19898E)
This astable multivibrator is one of the many configurations that we have in this section and on...