Sample and hold (CB8878E)

This independently charged circuit was found in a 1969 EEE. The operational amplifier supports a modern equivalent.

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Symmetric Power Supply (CB16761E)
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Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The...
Simple Symmetrical 6 V Power Supply (CB20207E)
This simple, unregulated power supply with an approximate 6 V output voltage can supply currents up to...