This is a low-gain amplifier to operate as a booster. We found it in an American documentation from 1947. The circuit uses a coupling transformer at the input.
This interesting automotive alarm was found in a 90's Popular Electronics. The circuit uses...
This amplifier provides a maximum power of 7 W, depending on the supply voltage. The integrated...
This circuit was obtained from a General Electric documentation from 1967. The time is given by...