Found in a Popular Electronics from the 90s, this circuit generates signals from 2 Hz to 30 kHz in different bands. The circuit can be powered by voltages from 5 to 12 V, depending on the application.
This circuit is from a 1968 publication, but it can be implemented with more modern transistors such as...
This circuit can supply currents up to 1 A from alternating input voltages. The circuit uses...
This 1988 circuit makes a back-and-forth of LEDs whose speed is controlled by P1. All components used...