Found in an Electronic Design from the 90s, this circuit does not need sinks for its components. The circuit converts 8 to 12 V input into 5 V x 3 A output.
This circuit simulates a resistor controlled by digital signals. We found it in American...
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
We find this circuit in documentation from the 1980s. The triac and diac are of conventional types...