Operating in class AB1, this high-fidelity amplifier was found in the 1961 RCA tube manual. The circuit has high input impedance and good gain.
This elementary receiver with a crystal earphone was found in Japanese documentation from the...
This stable 20 MHz oscillator was suggested by the National Semiconductor's Linear Applications Handbook...
This circuit allows controlling a LASER pointer with an input logic signal. R has 10 ohm for 3 V...