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Solution to the heat dissipation problem of three-terminal volt
by Tessie SwiftLM1805 outputs 5V and LM1805 outputs 5V. It can also be made into a power supply that outputs 5V, 9V, 12V, -5, -9, -12, etc. It is no problem to solder them together, just add a heat sink to LM7805. Just pay attention to the positive and negative when LM1805 outputs -. Use a 220V-12V transformer ...