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.
We found this circuit with transistors in a Philips documentation from 1968. The double transistor...
We found this circuit in a 1977 Timers Cookbook. The circuit uses common components to divide a 1...
Suggested to power the previous circuit, this power supply was found in the December 1990 issue of...