ONERR Mercury Distortion DST_2 traced schematic

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

IMO a really good sounding distortion with a pretty good range of settings.
Heavy metal housing, good mechanical and electrical workmanship.
ONERR DST-2 Topview.jpg
ONERR DST-2 Knobs.jpg
OnerrDST-2_PCB_Componets.jpg
OnerrDST-2_PCB_SolderSide.jpg
OnerrDST-2_PotentiometerPCB.jpg
OnerrDST-2_Wiring.jpg
OnerrDST-2_PCB_Layout.JPG
ONERR DST-2 Schematic.JPG

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toneman
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Post by toneman »

So an EQ with a 339 comparator???

Never seen that b4 :hmmm:
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Post by Manfred »

toneman wrote:So an EQ with a 339 comparator???

Never seen that b4 :hmmm:
thanks for the hint I marked it wrong in the schematic, here the correction:
ONERR DST-2 Corrected Schematic2.JPG
Last edited by Manfred on 18 Mar 2020, 22:50, edited 1 time in total.

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Post by bajaman »

How can IC3a and 3b be different devices ?
How can IC2a and 2b be different devices ?
There are two IC2 shown - one of them must be IC1 perhaps ?
:scratch: :hmmm:
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Post by Manfred »

bajaman wrote:How can IC3a and 3b be different devices ?
How can IC2a and 2b be different devices ?
There are two IC2 shown - one of them must be IC1 perhaps ?
:scratch: :hmmm:
bajaman
Thanks for your hint, you are right.
I am getting old. :slap:
I was still able to edit the above post and have attached the again corrected schematic.

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toneman
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Post by toneman »

Well, it got me wondering......
So I googled "comparator fuzz" and came up with the Craig Anderton "triggered fuzz", also known as a "sputter" fuzz.

Can't find the link now :whappen:

Many other examples: try popular electronics july 1968.......(?)

Another "rat" fuzz (2 diodes to gnd) but i like the EQ maybe convert to gyros(?)

Would be interesting changing the tranny to a jfet(J201) but would need to rethink the dc bias of the opamp.

Thanks for the corrections.
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Post by soulsonic »

Reminds me of a DS-1 with more full-featured tone controls
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