This circuit was obtained in a 1967’s EEE. Transistors and integrated circuits can be replaced by modern equivalents. The FET is for general use.
September 2017 - Microchip's MCP6411 operational amplifiers for frequencies up to 1 MHz are in...
This circuit activates a relay by activating one of a series of optical sensors that can be...
This is the circuit of a commercial flash from the 60’s. We found it in a march 1961 Radio...