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Author Topic: Overtone Layout  (Read 82222 times)
Kitarist
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« on: October 31, 2007, 03:58:37 AM »
Here is a Overtone Layout

* Dumble-ChassisLayout-50W-Mi.jpg (400.57 KB, 1746x946 - viewed 12897 times.)
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JeffreyB
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« Reply #1 on: January 24, 2008, 07:10:03 AM »
This is probably a dumb question....but that is the schematic, correct?
Is there a front panel layout anywhere that discusses the controls and what they do, as well as the internal trim controls?Huh?  (i guess something like a MANUAL)Huh?
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ChrisL
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« Reply #2 on: January 25, 2008, 12:28:34 AM »
No, that is the amps component layout.  There is no manual but the folks here can help you if you have any specific questions.  The controls are labeled on the layout and the amp faceplate pretty much resembles any Dumble ODS control panel.  There are plenty of pics on the www.  As for the 3 internal trimmers......2 of them I wouldn't bother adjusting and the OD trimmer is set to taste. 

Warning!!
Be very aware that there are voltages that can KILL you in there so DO NOT go poking around unless you are absolutely sure you know what you're doing.   
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herby660
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« Reply #3 on: January 28, 2008, 09:29:11 PM »
Hi everyone,

Does anyone have a 'schematic'  ? The layout is handy but  a schematic is handy for fault finding

Would appreciate one if anyone has a copy
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ChrisL
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« Reply #4 on: January 28, 2008, 11:29:09 PM »
If you find one...let me know. Wink
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ic-racer
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« Reply #5 on: January 29, 2008, 12:01:14 AM »
About the schematic, I cannot imagine someone building an amp without one, so I suspect Niki has one. If he wants to post it then that should be up to him. Personally, for my project using Niki's kit, I drew up a schematic by following the circuit in the layout posted here. My project has a different power supply, different transformers, slightly different grounding scheme and is 100W, so it does not exactly match the pre-built Overtone that Nike sells. I have no problem sharing it on this forum if it is OK with Niki.
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JeffreyB
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« Reply #6 on: January 29, 2008, 12:38:00 AM »
Hey...could someone show a closer pic of the front of the control panel and explain the contols?  (besides the obvious "input" and the tone controls)
Thanks....

I have a kit on the way, and am just very anxious...I know i love the dumble sound cips I've heard, but other than that, I'm not familiar with the control panel and features.

Thanks so much!
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Mark From Hawaii
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« Reply #7 on: March 01, 2008, 03:41:37 AM »
A few questions about the layout:

It looks pretty straightforward except fo the 3-pin devices labeled "5K" near wire B-25, "100K" near wire B-8, and "10K" on what looks like the "FET" daughter board.  Are these some kind of center-tapped resistor?  I've never seen something like that.  Huh?

Also, about the "FET" circuit.  Is the actual FET the grey blob in the middle of that daughter board?  If it is, I've never seen a 4-pin JFET or MOSFET like that.  I thought FETs are 3-port devices:  gate, drain and source.  Huh?

There are two connections to a "choke".  I'm assuming that the choke is an inductor mounted to the other side of the chassis as is the output transfomer.

I guess the "7812" is a 12 V voltage regulator device.

Just wondering.  If I can get these answers, maybe I'll actually feel inspired to CAD this as a circuit schematic in AutoCad.   Wink
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mcinku
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« Reply #8 on: March 01, 2008, 06:43:35 AM »
Quote from: Mark From Hawaii on March 01, 2008, 03:41:37 AM
A few questions about the layout:

It looks pretty straightforward except fo the 3-pin devices labeled "5K" near wire B-25, "100K" near wire B-8, and "10K" on what looks like the "FET" daughter board.  Are these some kind of center-tapped resistor?  I've never seen something like that.  Huh?

Those are trimmer pots. It's like a regular pot but these are used inside the amp.
http://www.allelectronics.com/cgi-bin/category/470100/Trimmer.html

Quote from: Mark From Hawaii on March 01, 2008, 03:41:37 AM
Also, about the "FET" circuit.  Is the actual FET the grey blob in the middle of that daughter board?  If it is, I've never seen a 4-pin JFET or MOSFET like that.  I thought FETs are 3-port devices:  gate, drain and source.  Huh?

Sorry don't know about that.  Huh?


Quote from: Mark From Hawaii on March 01, 2008, 03:41:37 AM
There are two connections to a "choke".  I'm assuming that the choke is an inductor mounted to the other side of the chassis as is the output transfomer.
Yes that's it.

Quote from: Mark From Hawaii on March 01, 2008, 03:41:37 AM
I guess the "7812" is a 12 V voltage regulator device.
Yes
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Mark From Hawaii
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« Reply #9 on: March 01, 2008, 06:51:29 AM »
Ahhh, thank you!  Cheesy
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ic-racer
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« Reply #10 on: March 01, 2008, 11:31:07 PM »
That fourth lead is just a case ground. It's the lower left FET lead on Niki's layout. The FET is not marked but I am expecting a NTE452 when my kit arrives.

I'm using 022699 (Fender Twin) choke, along with Fender Twin output and power transformers. (I'm making the 100w version)
« Last Edit: March 01, 2008, 11:35:29 PM by ic-racer » Logged
jzucker
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« Reply #11 on: March 03, 2008, 07:37:04 PM »
This is different from the generally accepted dumble layout. Are you guys interested in getting closer to what the "standard" is?
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mcinku
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« Reply #12 on: March 03, 2008, 08:42:58 PM »
Quote from: jzucker on March 03, 2008, 07:37:04 PM
This is different from the generally accepted dumble layout. Are you guys interested in getting closer to what the "standard" is?

What is the "standard"?

Aren't all of those amps tweaked in a some way.
To me, the goal is to make it sound good, whatever the layout is.

 Wink
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ic-racer
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« Reply #13 on: March 03, 2008, 09:10:38 PM »
Quote from: jzucker on March 03, 2008, 07:37:04 PM
This is different from the generally accepted dumble layout. Are you guys interested in getting closer to what the "standard" is?

Huh?
Niki's is the closest I have seen to an 80s ODS. If you don't consider actual component values, (you said 'layout') and realize Niki's is 50w (50w power supply etc) , whereas the real one was 100w, his layout is nearly exact. The only other things I can think to change would be to add the 50/100 switch and LED and remove the Impedance selector.

Are you thinking about a 90s ODS or a HRM?
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ChrisL
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« Reply #14 on: March 04, 2008, 12:02:58 AM »
Quote from: jzucker on March 03, 2008, 07:37:04 PM
This is different from the generally accepted dumble layout. Are you guys interested in getting closer to what the "standard" is?

Ohhhhh Yes!! I am so very interested....Ummm.   Which standard might that be....??  Do tell.
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