Integrator with sample and hold (CB8876E)

This circuit is from a 70s documentation. The maximum sampling rate is 800 Hz. The operational amplifier is a common type at the time.

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12 V to 110 V Inverter (CB19043E)
This circuit was found in an Electronics Now of 1988. The circuit is still current, and the power...
Detectophone (CB14733E)
With this name, we found this electronic stethoscope with a coal microphone in a 1957 Raytheon...
Benchtop Amplifier (CB17490E)
This transistor amplifier with complementary symmetry configuration can provide approximately 1 W...