This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the time. Current equivalent transistors may be experienced.
This circuit is from the National Semiconductor Audio Handbook. The amplifier operates with 6 V...
This circuit was obtained in an American publication of the time. Transistors are commonly used. The...
May 2016 - It can be obtained from Mouser Electronics new tricolors chipsLEDs from Broadcom for...