These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.
This circuit was found in the ON Semiconductor's Thyristor manual of the 1980s. The high quality...
This simple injector circuit can actually be powered by voltages from 3 to 9 V. The frequency is...
This 10 kHz filter is based on a 741 operational amplifier. The circuit is from Electronics Now...