This circuit was found in the October 1983 Radio Electronics issue. It is applicable to old analog telephones. The circuit uses common components.
This amplifier, with a power that reaches 3 W, according to the power that can be from 9 to 14 V,...
This approach alarm circuit was found in the September 1970 Radio Electronics issue. The 1 mH coil...
April 2017 - The new Alps UGMZ2AA Bluetooth communication modules can be found on Mouser...