We found this circuit in a 1980s General Electric documentation. It appears from other sources in this section. The circuit makes use of diacs and SCRs 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...