Voltage to frequency converter (CB8928E)

Found in ancient American documentation, this circuit uses an operational amplifier of the time, which is uncommon today.

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Beacon with instrument (CB20495E)
This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by...
Sensitive Touch Switch (CB488)
A touch in this circuit turns-on the lamp or the relay. Power supply is according the lamp or...
Touch switch (CB9375E)
This biestable circuit was found in a Popular Electronics from the 90s. The circuit has an unusual...