This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
This circuit with only two transistors is from an 80's EDN. It can be implemented with two current...
This circuit that has a response from 10 Hz to 700 kHz was found in Philips documentation from 1968. Dual...
We found this circuit in an old American documentation. It is an electronic rheostat with a...