Voltage-controlled current drain (CB9432E)

This circuit was found in a 90's EDN. The load depends on the used transistor.

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TV Microtransmitter (CB4671E)
We find this ultra-simple transmitter circuit that is nothing more than a very short range RF...
Logarithmic Converter for Photodiode (CB14317E)
The circuit shown is from National Semiconductor's Linear Applications Handbook published in 1994....
Window detector (CB9706E)
This configuration that appears several times with variations on this site is from old American...