HANDY 0-12V DC POWER SUPPLY ELECTRONIC DIAGRAM For heat protection, heat sink is needed for the BD679 transistor. It is because it will be over tempered when works more than 200mA. FEATURES: 0v to 12 volt output: - 700mA with M 2155 - 1.4amp with M 2156 - 1A with 16v AC 1.5 amp plug pack