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.
We found this circuit in a 1979s British publication. The circuit can be assembled with more...
This simple digital frequency meter using CMOS circuits reaches 5 MHz frequency. Input signals are...
This 16-second voice recording circuit was featured in a telephone answering machine circuit in...