This circuit is from a Radio Electronics from July 1965. The circuit uses components from the time also controlling a servo from the time. The power supply is 28 V.
This circuit that has a response from 10 Hz to 700 kHz was found in Philips documentation from 1968. Dual...
This circuit is from old documentation, using a component that cannot be found easily today. The...
This circuit was found in an ancient American documentation. The integrated circuit is of the time...