Pulse sampling (CB8881E)

This circuit was found in a 1966 EEE. Transistors support modern equivalents and the waveforms are given next to the diagram.

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Oscillator with constant current load (CB8038E)
This linear oscillator was found in a 1968 publication. The operational amplifier is from that...
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This circuit was found in Radio Electronics from May 1965. The SCRs and transistors are from that...
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This Wien bridge circuit, using a 741 operational amplifier, was suggested by Texas Instruments in its 1996...