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.
The idea of this circuit found in a Radio Electronics from January 1966. The idea of the...
Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next...
By the components used this circuit of old English documentation can still be easily assembled. The...