These 6 to 12 V source with current up to 100 mA was found in Radio Electronics magazine from June 19666. The source has a current indicator and uses transistors of the time.
This traditional configuration from a simple 12 V source is from a 1977 publication. The...
The circuit is suitable for small animations, with the movement effect of the LEDs in a matrix...
This circuit is from the National Semiconductor 1977 FET Databook. The FET can be BF245 or MPF102...