This circuit is from 1999 documentation. However, it can still be easily assembled, as all components used are common. The sensors can have their quantity increased, being connected in parallel.
Found in a 90s ARRL Handbook, this circuit is intended for the production of signals in the side...
This is the circuit of a hearing aid amplifier manufactured by Sony in the 1960s. The circuit was...
This variable frequency oscillator generates signals that have a recurrence frequency determined by...