Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors support modern equivalents. The circuit can be used as a shield.
This small FM transmitter can be powered by solar cells in the range of 1.2 V to 6 V. Its range...
We found this test circuit in the November 1999 issue of Electronics Now magazine. The circuit is to be...
We found this circuit in a 1966 documentation. The circuit is intended for a door opening system by the...