Hello, today friends come to see at a house , and electronics old equipment the a lot of. Now he wants power supply Voltage circuit 7.5 Volt sizes. That are of good quality good and the price economize. By can give the electric current has 1 Amp. When I sees part his, I thinks should use the circuit that have IC LM7805. We can enhance Potentiometer VR-5K, For fine decorate the level. Voltage output get about 7.5V get follow want. You should hold Heat Sink help let off the heat gives IC LM7805 get appropriately. The detail is other , see follow the circuit.