This circuit, which can be used as a shield, was found in American documentation from the 1970s. This configuration appears elsewhere in this section from other sources.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...
This circuit can be used in panel signaling with common incandescent lamp. The lamp will flash at a...