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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Linear LED Control (CB11573E)
This circuit allows linear brightness control of an LED from an input voltage. The power supply must...
Transistor Astable (CB997E)
This basic configuration of an astable multivibrator was found in a publication of the year 1968....
Multiple Level Indicator (CB25417E)
This circuit for multiple sound inputs was found in a Radio Electronics from January 1992. It...