DOD250: adding a tone control

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DOD250: adding a tone control

Postby jagermonster » 03 Dec 2010, 23:47

I'm still really enjoying messing around with my DOD250.

I've been reading about tone stacks on pages like this:

http://amps.zugster.net/articles/tone-stacks
and
http://www.beavisaudio.com/techpages/BigMuffToneControl/

But, being a noob, I can't really grasp how I would add a tone control to the 250 circuit. Building the separate housing like Beavis recommends looks pretty easy, but not exactly what I'm looking for.

Can anyone offer some help?
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Re: DOD250: adding a tone control

Postby jimbob_400 » 04 Dec 2010, 12:36

jagermonster wrote:I'm still really enjoying messing around with my DOD250.

I've been reading about tone stacks on pages like this:

http://amps.zugster.net/articles/tone-stacks
and
http://www.beavisaudio.com/techpages/BigMuffToneControl/

But, being a noob, I can't really grasp how I would add a tone control to the 250 circuit. Building the separate housing like Beavis recommends looks pretty easy, but not exactly what I'm looking for.

Can anyone offer some help?


Choose your tone stack. Disconnect the wire going to the volume pot (coming from 2 diodes a 10k resistor and a 1nf cap) move this wire to the input of your chosen tone stack. From the output of your tone stack go back to the volume control. The next part is optional.

Technically a good thing to do next would be to buffer the output of the pedal. Take lug 2 of the volume pedal and disconnect it from the switch. Take this to a simple bipolar transistor buffer and then take the output of the buffer to the switch.
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Re: DOD250: adding a tone control

Postby jagermonster » 04 Dec 2010, 20:44

Thanks a lot for taking the time to make a thorough reply.

So, if I'm understanding correctly, the tone stack is the last thing in the circuit? Essentially, just place it between the output of the circuit board and the volume control?
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Re: DOD250: adding a tone control

Postby roseblood11 » 05 Dec 2010, 00:28

The DOD 250 doesn´t deliver very much volume, and the tonestack steals away some more decibels.
That´s why many similar pedals have another gain stage after the tonestack...
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Re: DOD250: adding a tone control

Postby jagermonster » 05 Dec 2010, 03:03

roseblood11 wrote:The DOD 250 doesn´t deliver very much volume, and the tonestack steals away some more decibels.
That´s why many similar pedals have another gain stage after the tonestack...


This makes total sense.

If I use LEDs as clipping diodes, would this raise the volume level enough to compensate for a tone section?
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Re: DOD250: adding a tone control

Postby roseblood11 » 05 Dec 2010, 11:11

A bit, but why don´t you add a second gain stage? You could use a dual opamp, a 1458 is very close to the 741.
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Re: DOD250: adding a tone control

Postby jimbob_400 » 07 Dec 2010, 00:06

or just use my output buffer suggestion but use the transistor to increase the gain of the signal a bit to compensate for the tone stack.
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Re: DOD250: adding a tone control

Postby Branimir » 07 Dec 2010, 05:02

For instance, Rat has a Fet stage after the tone control, you could use that trick.
If you scoop, it sounds like poop!
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Re: DOD250: adding a tone control

Postby roseblood11 » 12 Nov 2016, 22:11

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Re: DOD250: adding a tone control

Postby Moonsun » 17 Nov 2016, 15:03

Check out Quantum Mystic schematic. It's slightly modded 250 with active 3-band one control.
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