This car audio amplifier was found in a Popular Electronics Hobbyist Handbook from the 1990s. The circuit uses the TDA2004 to boost the car radio output of cars of the time.
The figure shows three circuits for using headphones in amplifiers with speakers that do not have...
In this charger, the charging current is basically limited by the LEDs. The transformer is a low...
This configuration is from an old integrated circuit manual. The circuit can be applied to modern...