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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DC speed control (CB7149E)
This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a...
Micro AM Radio (E/P) (MIN020E)
This micro AM radio will tune strong stations in the frequency range between 530 and 1,600 kHz....
TV Transmitter (CB15706E)
The circuit shown in the figure generates a signal between 50 and 100 MHz and can therefore be...