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.
Taiyo Yudem SAW filters can be ordered from Mouser Electronics for UMST (W-DMA), GSM, CDMA, LTE,...
This simple circuit consists of an oscillator that can be activated both by the action of NO and...
This circuit was found in a Radio Electronics Constructor, English magazine from April 1976; The...