Hi
I have a couple of problems
I finally finished off my ambika today as my metal case arrived from adrian.
As I was tuning the voice cards I noticed no audio was coming out of slot two although both led’s on the card are lighting up when I have that slot selected.
I have tried a different voice card in this slot and it still doesn’t work, the first voice card works fine in the other slot though. when I try the individual out for two if I turn my monitor level up pretty high I can hear it quietly and really distorted.
Also is the first led in the 6 supposed to be orange constantly it also is green at the same time when voice card 1 is on? it’s definitely in the right way.
My final question whilst tuning I was playing C3 - C4 but the ambika was playing more of the region of C5 - C6 and just slightly out of being an octave apart is this normal. I was testing it through melodyne.
> supposed to be orange constantly it also is green
Yes. Orange = receiving synth parameters data from the motherboard, green = receiving a note.
> whilst tuning I was playing C3 – C4 but the ambika was playing more of the region of C5 – C6
This depends on the cutoff frequency actually! Just make sure that the notes are an octave apart.
Make the “dead” voicecard play a note, and probe various points, including the individual output for this voicecard (if it works, would be a problem at the mixer), the middle pin of the A/B out selector (if it works, would indicate a bad connection in the voicecard stack), and then the intermediate filter poles outputs (check the schematics).
Yeah, I bet cards 4 and 6 are not working either go into the patch settings menu and make sure these voices are selected for the channel you are sending on. That menu probably looks like this: [1] 2 [3] 4 [5] 6 - should be [1] [2] [3] [4] [5] [6]
@mmarsh tested all that had it so it was just [2] no sound, but had sound from every other card when each selected by themselves.
@pichenettes okay thanks, the remaining 5 voices sound tuned about right. sorry im not that good at electronics, so im not quite sure which points to test. but measuring the middle pin of the a/b on the right hand side ( the one inline with midi out) i got a reading of 4.92.
Sorry do i just use a pair of cheap headphones? I tried just touching the a/b with the headphone jack but no sound and I tried the other two voice cards and no sound so i guess I was doing it wrong.
thanks
haha nice, would like to see someone actually fit a gramaphone to a synth cant imagine it would sound too good though.
Dont worry was only a £1 pair of headphones I bought to test when building a x0xb0x and I made sure there was no loud noise before putting them on, there wasn’t any sound at all.
Thanks I will give that probe a try, just I wont get the parts for it till friday when Im in the area of the nearest electronics shop.
So I tested on on the a/b jumpers and the sound is the same on the slot 2 voice as is it is on the other voice cards. Im not sure what exact points to test next.
I placed the probe on the left hand a/b of voice cards 6,4,2 and I could hear the note that each voice card was playing. I then put the probe on the right hand a/b of those cards and heard the same noise on each card.
By left side I mean I have the ambika on its side with the ins/outs facing the ceiling.
So the signal for voicecard 2 is present on the A/B selector, but then not present at the individual output? Now, try probing the 470 ohm resistor resistor in front of the individual output 2. Can you hear voicecard 2’s signal there.
go into the patch settings menu and make sure these voices are selected for the channel you are sending on. That menu probably looks like this: [1] 2 [3] 4 [5] 6 - should be [1] [2] [3] [4] [5] [6]
