Soulsby Synths Forum

Technical Support => miniAtmegatron Hardware technical support => Topic started by: Ian on September 18, 2015, 10:59:56 AM

Title: led problems
Post by: Ian on September 18, 2015, 10:59:56 AM
Hi all, having terrible problems soldering those pesky miniATmegatron LEDs in place without bridging the pads - so much so that I've now managed to burn off at least one of the pads from the circuit board. :-(
Only using a 12W iron, so you can see I had to try really hard to put myself in this powerful position.
I'm going to have to use some wire jumpers to sort out my mess.
Looking carefully at the tracks on the circuit board itself, it looks like not all of the LED legs form part of the circuit.
Can anyone confirm whether this is true or not and if it is, which legs on which led can be left unsoldered?
Any help much appreciated.
Title: Re: led problems
Post by: paulsoulsby on September 19, 2015, 08:33:37 AM
All the pins of the function LED are used.  Just the red and green pins of the value LED are used.  Blue and ground tied together

Schematic here: (

LED specs here: (

blue and ground are the middle 2 pins.

May be worth looking into a panel mount LED if you have to replace them.  Try and find one with specs as similar as possible to the provided ones.  Otherwise you may need to change the resistor values.
Title: Re: led problems
Post by: Ian on September 19, 2015, 07:40:51 PM
Excellent, thanks for the info and advice - much obliged