DOD - 210 FET Preamp  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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marmaliser
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Post by marmaliser »

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

Here are some Pics
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IMG_0195.jpg (1.65 MiB) Viewed 5192 times
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Discofreq please feel free to use these on the effects database

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marmaliser
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Post by marmaliser »

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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Post by Greenmachine »

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.
"[Y]ou want sketchy, dude? I breadboard on a door." -- RnFR, 2011
"This amp is freakin loud, like crazy, I'm going to kill pets loud." -- mich, 2011

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marmaliser
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Post by marmaliser »

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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marmaliser
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Post by marmaliser »

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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Post by jazzmguitar »

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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Duckman
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Post by Duckman »

Reduce pic size? :secret:

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Post by jazzmguitar »

Hi, manged to make photos smaller hope someone can help....
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Post by jazzmguitar »

This might help lead to the answer?
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Blitz Krieg
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Post by Blitz Krieg »

get a plastic power jack?

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Post by modman »

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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DOD - 210 FET Preamp schematic
DOD - 210 FET Preamp schematic
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Post by jazzmguitar »

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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Post by modman »

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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Post by jazzmguitar »

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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Post by jazzmguitar »

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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RenatoBrandão
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Post by RenatoBrandão »

Does anyone have a picture of this board? On the solder side?

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