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Author Topic: USB Breakout board for Mach3  (Read 3592 times)
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Rhonmac
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« Reply #30 on: November 29, 2011, 08:51:30 AM »
Hi, thanks for the reply, picked it up today have been away.

When you say to put a 5vdc led in the circuit i assume you mean the +5v and ground on the step/direction outputs. If so i  have tried one following your suggestion and the led does not light. The led is ok.

Any other help please if possible.
Best wishes.
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stirling
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« Reply #31 on: November 29, 2011, 09:10:25 AM »
NEVER put an LED accross 5Vdc without a current limiting resistor (unless that 5Vdc is a PWM signal carefully designed to match the specs of the LED). You stand a very good chance of either blowing the LED or the output stage of the device supplying the 5V depending on it's current sourcing capabilities.

Ian
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