Bobby Baird

Re: G.TEN 500 series graphic eq
« Reply #40 on: August 14, 2020, 09:32:51 AM »
U1 seems to be getting really hot. I'm guessing there's a short somewhere, but I can't see it. Is U1 on the input or output?

U1 Is the 1246 balanced input buffer which gives a -6db drop in signal.


Re: G.TEN 500 series graphic eq
« Reply #41 on: August 14, 2020, 09:40:03 AM »
U1 Is the 1246 balanced input buffer which gives a -6db drop in signal.

this is true for G.TEN V1. V2 uses NE5534A as input buffer.

Re: G.TEN 500 series graphic eq
« Reply #42 on: August 14, 2020, 09:41:48 AM »
I finally got a chance to finish the opamps and test these out. Unfortunately, only one of them is working at the moment. I must have screwed something up, but I can't figure it out.

The one that isn't working passes signal in bypass, but nothing when engaged. The LED changes from red to green, but no signal. I switched the DOAs, but that doesn't make a difference. I compared the two units, and all the components are identical and in the same polarity. All the opamp power rails have the correct voltage (including DOA), and I can hear the relay activating, so I don't think it's a bad relay. It's hard to troubleshoot much further without a schematic though. Is it possible to get a schematic, or does anyone have any idea of what the issue might be?

As a side note, the one that's working sounds fantastic!

You can send me an images of your nonworking unit and I think I will find a trouble.

Re: G.TEN 500 series graphic eq
« Reply #43 on: August 14, 2020, 09:44:11 AM »
U1 seems to be getting really hot. I'm guessing there's a short somewhere, but I can't see it. Is U1 on the input or output?

U1 is an input buffer. If you have G.TEN V2 boards it should be NE5534. Check direction placement or try to replace it (if it's burned already).
And I wrote you in PM you can check signal flow using updated assemble manual. Check first post of the thread.

Bobby Baird

Re: G.TEN 500 series graphic eq
« Reply #44 on: August 14, 2020, 09:46:28 AM »
My guess is your IDC male connector on backside of front panel board might be shorting out. Igor is very specific about filing the contacts down and covering it with tape as to avoid shorts.

Re: G.TEN 500 series graphic eq
« Reply #45 on: August 14, 2020, 09:59:57 AM »
IMPORTANT MASSAGE!

I added updated assemble manual in a first post of the thread. It's for G.TEN V2 boards revision. 
On page 45 it contain step-by-step instruction for checking signal flow from IN to OUT. Can be useful for troubleshooting.

Cheers.
Igor

OneRoomStudios

Re: G.TEN 500 series graphic eq
« Reply #46 on: August 14, 2020, 10:05:08 AM »
IMPORTANT MASSAGE!

I added updated assemble manual in a first post of the thread. It's for G.TEN V2 boards revision. 
On page 45 it contain step-by-step instruction for checking signal flow from IN to OUT. Can be useful for troubleshooting.

Cheers.
Igor

Thank you Igor! I will take a look.

My guess is your IDC male connector on backside of front panel board might be shorting out. Igor is very specific about filing the contacts down and covering it with tape as to avoid shorts.

I cut them short as directed and insulated with electrical tape. I don't think that's the issue. Good idea though!

You can send me an images of your nonworking unit and I think I will find a trouble.





Thank you both for the help!

OneRoomStudios

Re: G.TEN 500 series graphic eq
« Reply #47 on: August 14, 2020, 10:12:46 AM »
I figured out my stupid mistake! I had the 5534 and 5532 switched in U1 and U2.

Embarrassing, but innocent enough. I'll leave all this up as a precaution/reminder for others. Thanks again for the help!

Re: G.TEN 500 series graphic eq
« Reply #48 on: August 14, 2020, 12:53:02 PM »
My guess is your IDC male connector on backside of front panel board might be shorting out. Igor is very specific about filing the contacts down and covering it with tape as to avoid shorts.

G.TEN third batch will fox it. There will be smd IDC connector.

SKJGProject

Re: G.TEN 500 series graphic eq
« Reply #49 on: August 17, 2020, 09:15:52 AM »
When will it be available?
I used to date a blind girl. Her name was ::… ..:.: .:::. .::.. ….: .:.::


Re: G.TEN 500 series graphic eq
« Reply #50 on: August 17, 2020, 10:40:19 AM »
When will it be available?

Well, I can't tell you exact date but I think somewhere in September/October 2020 .
At this moment I'm waiting to receive custom ordered S-curve slide potentiometers, then I should receive front panels and all other parts.
As I want to make a full kit (including 2520 and output transformer) I ordered E-core iron for 2503 type transformer. Yes, I will wind them myself with computer winding machine that I already got :P


 

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