P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The frequency is given by C1 which can have a modern standard value such as 3.3 uF or even 4.7 uF.
This circuit was obtained in a 1964 Electronic Design. The circuit uses components from that time,...
This circuit is from a 1995 publication. The components are all common and the number of LEDs may...
This simple sweep generator circuit has been found in older documentation, but can still be easily...