DOD - 210 FET Preamp  [schematic]

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DOD - 210 FET Preamp

Postby marmaliser » 01 Feb 2011, 10:21

Did a search and can't see anything specific for this

Here are some Pics
IMG_0195.jpg


IMG_0197.jpg


IMG_0201.jpg


Discofreq please feel free to use these on the effects database
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modman (14 Apr 2019, 18:52), RnFR (01 Feb 2011, 17:40)
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Re: DOD FET Preamp

Postby marmaliser » 01 Feb 2011, 10:24

Judging by the pot date this is from around 1979. I will do a shot of the other side of the board when I get home.
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Re: DOD FET Preamp

Postby Greenmachine » 01 Feb 2011, 19:40

I built a clone of one of these. I used to call it a dirty clean boost. Not as high gain as the Crackle-Not-Okay I recently built, which is loud-as-all-get-out ... all I have to do is switch it on and I'm boosted, volume at zero.
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Re: DOD FET Preamp

Postby marmaliser » 01 Feb 2011, 21:32

Just flipped the board over and it has 210 written so this is just the FetPreamp 210 in an earlier box
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Re: DOD FET Preamp

Postby marmaliser » 01 Feb 2011, 21:32

Just flipped the board over and it has 210 written so this is just the FetPreamp 210 in an earlier box
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dod fet preamp 210 grey

Postby jazzmguitar » 27 Jul 2015, 14:09

I have a dod fet preamp 210 grey one knob . Years ago I added a led switch and power supply. All works apart from when the power supply touches the metal case it then cuts off and power doesn't go to the pedal . Any ideas how to rewire it correctly? I tried to insulate around the power supply which didn't work great. Hope someone can help. Tried to upload photo but it 4.5mb limit is 1mb..
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Re: dod fet preamp 210 grey

Postby Duckman » 28 Jul 2015, 02:00

Reduce pic size? :secret:
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Re: dod fet preamp 210 grey

Postby jazzmguitar » 28 Jul 2015, 13:52

Hi, manged to make photos smaller hope someone can help....
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Re: dod fet preamp 210 grey

Postby jazzmguitar » 28 Jul 2015, 13:56

This might help lead to the answer?
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Re: dod fet preamp 210 grey

Postby Blitz Krieg » 29 Jul 2015, 06:27

get a plastic power jack?
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Re: DOD - 210 FET Preamp  [schematic]

Postby modman » 30 Jul 2015, 17:28

dc jack is probably grounding on the case?
did you connect the 9v to that pole on the dc jack?
if that's how your power source demands it, you should get a fully insulated jack.

schematic found online...
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Re: DOD - 210 FET Preamp

Postby jazzmguitar » 31 Jul 2015, 23:25

Many thanks for your replies. Sorry I'm not very good at this when you say did I conect 9v to pole on jack I'm unsure what this means. Do you mean were does the positive go from power jack go? I ve try to show this in the photos of the board... they go to second hole on the board please excuse poor soldering skills. Please see attached is this the part I need i e a insulated power jack ...thanks phil
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Re: DOD - 210 FET Preamp

Postby modman » 01 Aug 2015, 13:35

Please don't snapshot & upload 0.5MB images that you can link too.
Get a digital multimeter and check for continuity: is the metal part that's touching the case connected to red/black/white wires?
If white is 9V+ as is the red one, they should be connected together. But the pictures don't tell anything really, we cannot tell what is connected to what.
Debugging = testing the circuit, it cannot be done by pictures alone.
if you have no skills and no multimeter, stop trying.
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Re: DOD - 210 FET Preamp

Postby jazzmguitar » 01 Aug 2015, 14:03

Hi I have a multimeter and willingness to try. I can confirm the 9v + from power supply goes where originaly the 9v+ from the battery went as shown in the schmatics. The 9v+ is not conected to the case until the power supply javk is inserted this then completes a circuit and the plus side is conrcted to the case as tested by the multi meter. I assuming this is because the power jack is metal and need a plastic one instead? Thanks
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Re: DOD - 210 FET Preamp

Postby jazzmguitar » 08 Aug 2015, 11:43

Update fitted plastic power jack and all works perfectly . Thanks for your help this is a underrated pedal I shall use it over the next few gigs and report back.
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