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 in the 1994 National Semiconductor Linear Applications Handbook. The circuit is...
This circuit is from an American manual from 1974. It uses a diac (Q1) and the SCR can be the...
This semi-proportional temperature control was found in old American documentation. The components are...