This circuit of starting lights for auto-race was found in an English documentation from the 80's. The LEDs must be of different colors, for greater realism.
This circuit consists of an ultrasonic transmitter for alarm found in an Italian magazine...
With this oscillator we can obtain a signal of 10 W of power at the frequency of 100kHz. The...
Found in a 90s EDN, this circuit uses components from that time. The circuit supplies a current of...