Hi!
It’s quite late here (in the middle of the night :)) and I have been working on my motorfader-module.
When I measure the Voltage at C4 it’s 6,45V only which is way to low. The faders just move a little.
Now a small story which might have nothing to do with that, so you don’t have to read it:
I couldn’t find out what could be the cause, so I thought I might have connected the 1k pot in a wrong way. I’m not an electronic engineer and I had some beer so there might be some stupid thoughts behind that…
I have the pcb from mike and it has 4 pads and 4 drilled holes where there should be 3 for the pot. (there are just 3 green pads in the brd-file). Well I then tried the “other” possible way the pot could be connected, resulting in a mf-voltage of 10V and a small fire between the pot and C3 which melted the cap’s isolation… I think I can fix that tommorow… still have a pot and a cap somewhere.. hope that nothing else has been fried.
Just to be sure that this was a stupid idea…
… the 4th hole is where I drawed the red dot. that’s where I moved the bottom pin of the pot when the inferno broke loose… Well I really don’t know why mike drilled this hole (anyway the all of the holes where too small for the pot he sent me with it).
But now back to the MF-Voltage and the question why it is that low. I tried with different psu’s from 12-15V with the same result. Any ideas?
Is it normal that the LM317 get REALLY hot? I put a small heatsink on it when I realized that but I still don’t trust it. Could that have to do with my voltage problem.
I hope someone with a little more knowledge can help.
cheers,
rambinator