The maximum input voltage of this circuit is 20V and the output current is 250 mA. The circuit is from old documentation. The integrated circuit used is no longer common in our time.
This circuit appeared in Radio Elecronics magazine in 1968. The operating circuit is a...
The presented circuit activates a relay when a telephone call occurs. The relay can be used to...
Here is a high-quality intercom for demanding readers. The circuit is from a 1982 documentation. Of course,...