NES LED with Mausberry circuit - LED won't light up?
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@robertybob don’t take this as ctriticism, but as you soldered it only to realize it doesn’t work, any chance you soldered it backwards? LEDs only work in one direction.
I have a mustberry circuit, but the LED I use is built into my power button and it is have a resistor built-in for 5 volts. Otherwise, I’d say you should use one. -
@caver01 Thanks for replying :) I don't understand what you mean by soldering it backwards? I followed the instructions on the Mausberry website
and soldered the white wire from the NES to the LED 3V on the Mausberry board. Is this not what I was supposed to do? -
When you desolder the led on the nes did you reverse the polarity for the mausberry circuit? That needs to happen.
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@robertybob I was merely suggesting that since an LED has two leads coming out if it, it has to be soldered correctly. It is a diode, so polarity matters. If you solder an LED backwards (wrong pins from the LED) it won't work, and flipping it around will--assuming everything else is correct.
Sorry, I don't have direct experience with the NES project, but if it was as simple as LED polarity and you were unaware, I thought my comment might help.
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Guys, the Mausberry schematic shown above pertains to the color coded wires from the NES switch module that @robertybob was just following per instruction. There is no desoldering and flipping of LED leads. I also have an NES console that I modified for Retropie but I use the ControlBlock rather than the Mausberry circuit. The ControlBlock provides a 220 ohm resistor for the NES LED. It works fine with the White, Orange, and Yellow wires per schematic above. I do not know if Mausberry provides a current limiting resistor.
@robertybob, do you know if the LED was working before you installed the wires to the Mausberry? It could be that the LED was already bad to begin with.
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It's not clear from the website whether the mb curcuit has a resistor behind the LED pad. I doubt it.
According to the site:
"The circuits all come with a 3V LED pad on them as well so you can connect an external LED that will turn on and off with the circuit (ground to RST- on circuit or any ground GPIO pin on Pi)." -
Maurberry circuit.com has the instructions in complete detail. Desolder the original led and then change the polarity when you solder it on the mausberry circuit. Otherwise your led is faulty. I'm using the mausberry circuit in my nes and no trouble with the led. I replaced mine with a green led and it rocks!
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@space-cadet Something is amiss with your link.
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Google is your friend. After you desolder the led reverse the polarity and solder it on the mausberry circuit. Instructions are on the site. Mine works fine and no resistor needed.
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Apologies @caver01 , electronics are a new experience for me :)
@ortsac I'm unsure (bought it as 'for spares or repair' from eBay) but presumably it's possible to change it?
@space-cadet So you soldered the LED directly onto the Mausberry circuit, rather than put it back to its original location? Thanks for letting me know, I wish the Mausberry website made that clear (!). I couldn't see any mention of de-soldering on their website.
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