If you want to make a 3.3v reg, simply replace the LM7805 with a 3.3V regulator (such as a UA78M33), everything else in the circuit is the same, remember, though, that more voltage is being dissipated, so the heat sink on the module will get hotter. I needed to increase the hole size for the Reg because the legs are wider than the other through-hole components that I've used. Arduino boards also include voltage regulators that can be used to power them from a battery or a wall wartstyle power supply. The LM7805 is then soldered into it's holes. Note the orientation of the capacitors, these are polarized electrolytic capacitors with the negative sides facing each other on the board. The pins are on the copper side of the board because that's how you plug the circuit to the breadboard.Īfter the pin headers, I solder the resistor and LED followed by the 2 x 100nF capacitors. The connection pin headers are pushed all the way through the board so that the plastic pin header housing doesn't have any pin protruding. The input pin headers are inserted normally and are soldered in at the top left of the board. I've taken to using thick traces to improve the circuit etch results. Using whichever etching technique that you prefer, etch the circuit and test it.
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