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Circuit Bench

20 mA constant power for LED (CB14629E)
This circuit is from a 1978 Texas Instruments optoelectronics manual. The trimpot adjusts the LED...
Precision sample and hold (CB8882E)
Found in a 1969 EEE, this circuit is based on an operational amplifier of the time and on old type...
3 decades generator 15 Hz to 15 kHz (CB9195E)
This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741...