Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
This circuit provides a multiplexed signal to be applied to the input of an FM transmitter. The...
This simple TTL circuit indicates which was the first to press one of the four pressure switches. The...
We found this circuit in a documentation from the 90s, which can be adapted in most cars of the...