Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Precision Voltage to Frequency Converter (CB6106E)
Suggested by the National Semiconductor in 1980s documentation, this circuit uses components from the...
Schmitt Trigger LM3900 (CB5049E)
With a strong positive feedback (via a 10 M resistor) we can get the trigger setting for the...
100 V x 5 mA Voltage Regulator (CB835E)
This high voltage regulator uses only two passive components. The output is 100 V, but replacing...