This 1988 circuit makes a back-and-forth of LEDs whose speed is controlled by P1. All components used are common and the circuit can be powered by voltages from 6 to 9 V.
This source is indicated for the power of the digital multimeter of the CIR12007, but it can be...
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...
This circuit was found in a Popular Electronics from the 90's. The operating curve is given next...