Found in American documentation from the 90s, this circuit is ideal for wearables and can be powered by voltages that depend on the number of LEDs.
This 1 to 40 MHz amplifier is from a 1969 Motorola documentation. The components are of the time...
Suggested by Sprague in the 1980s documentation, this circuit can control three-phase AC motors....
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...