mathflan
Well-known member
I finished to wire the stereo link but It doesn't work
I check all voltages and wiring, All seems OK.
Do I miss something?
thanks
I check all voltages and wiring, All seems OK.
Do I miss something?
thanks
Soeren_DK said:Is this correct? ???
Cheers
Søren
craigg said:HI there. I have two mnats 1176s. One is a Rev A, and one Rev D (with hairball kits). work great. Sound great. Got the stereo linking kit and put it together. Not sure if the stereo linking works yet because I'm having a problem powering the stereo link pcb in the Rev A. The Rev D seems fine. When I try to power the SL pcb on the 30v test point in the Rev A, my audio level drops, the compression goes away (turning the compression on or off makes no difference, and my 30v test point reads about 26v and my -10v test point (which read about -8.5v) goes to -12v. Unhook the 30v power from the SL pcb and the unit works fine - compression, all switches, etc. Anybody have any idea? I hooked up this pcb to the rev d that I have and it worked fine (didn't have this problem), so I feel confident that the SL pcb isn't the culprit. Thanks everyone.
ricothetroll said:I might be wrong but it appears to me that Soeren_DK's wiring doesn't make sense : pad 15 of the main board mustn't be connected directly to pad 15 of the ratio board as it used to without the stereo link. Pad 15 of the ratio board is where the signal enters the sidechain, connecting it to pad 15 of the main board means that when the link is activated, both the output of the preamp AND the sum (L+R) goes to the sidechain.
ethervalve said:Hi all,
I think you were right dmp. Re-wired it and the oscillation went away. Thanks!
Now, I'm still unable to get the stereo matching to work perfectly though. At slowest attack/fastest release i'm getting about a 3 dB discrepancy in gain reduction between units whenever I got beyond about 5dB or 6dB in GR.
A couple things I'm wondering about:
1) there seems to be a great deal of Gain reduction interaction when I adjust the release pot on either unit--would switching to tighter tolerance release pots be worth attempting? I'm currently using 20% alphas. (I noticed this older post from Gswan that suggested checking the 5meg pot when attempting the "connect pad 7" style stereo match: http://www.groupdiy.com/index.php?topic=646.msg439565#msg439565 )
2) I had to drop in a 4.7k trimmer to complete the tracking adjust calibration for one of the units (the other had enough range with the standard 2k trimmer). Does this suggest anything fishy? Both units seem to behave identically outside of the stereo link mode when fed the same programme.
ricothetroll said:Hi Mike,
Thanx for your answer !
I'm using the Gyraf Audio version, maybe that's the reason why we have those differences.
http://gyraf.dk/gy_pd/1176/1176.pdf
If you take a look at the ratio board on the first page (superimposed view), you see that pin 15 feeds on the one side the pot, and on the other side the sidechain (rotary switch) through the top left 56k resistor.
I'll try my wiring and let you know the result !
Best regards.
Eric
mathflan said:Thanks echo north for the PCBs
Echo North said:Definitely what DMP said. The parallel resistor on each pot is dominating the over all resistance.
Maybe your fets are out? Did you get them from me? In the past you could order 2 sets of FETs from me and they would give you stereo linking withing 1db up to about 10db GR. UNLESS you were unlucky enough to get the two that were at either extreme of my matching window. I've since addressed and fixed this issue. If you got FETs from me and think they may be the issue let me know and I'll send you new sets.
Mike
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