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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Crystal low frequency oscillator (CB7533E)
Found in an RF Design from the 90's this circuit is intended for crystals of less than 1 MHz....
Simple Amplifier Stage (CB232E)
This simple stage can operate with low frequency signals (audio), driving a small lodspeaker....
CB25544E Voltage Doubler 555 ()
This circuit, which can generate voltages up to 25 V, was found in the December 1992 issue of...