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LED wiring and resistance
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The brightness of an LED is proportional to the current flowing through it. Most LED's can handle up to 30 mA, and I shoot for about 20 mA. <br /> <br />Put the LED's in series with the tortoise switch machines (the two in parallel but reversed polarity). No resistor needed. I have done this AND wired a 1000 ohm resistor across the tortoise to increase the current through the LED, but I was using a 10.5 volt power supply and my LED's had a 2 volt drop across them. I was seeing 15 mA without the additional resistor. <br /> <br />If you want to wire the LED's across the tortoise, I'd use a 560 ohm resistor, as a larger value will leave the LED dimmer. For me, brighter is better. <br /> <br />Mark in Utah
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