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.
This circuit consists of a simple continuity test with two transistors forming a relaxation...
This circuit is intended for the production of an audible signal from the capture of a continuous...
This circuit can be used for signaling a panel with a common incandescent lamp. The lamp will...