Fred Briggs Overdrive

[VanDerchuck]

I'm sorry if this has been posted. I haven't found a layout for it yet. Seems like a good candidate for this site.

Here's the link to his page.

http://revolutiondeux.blogspot.com/2009/01/fred-briggs-overdrive.html?m=1

Here's the schemo.



Thank you

[doomkraft89]

[Alex]

Another possible version with some "extras" from Fred's blog.
Added a volume pot but i'm not sure how it would work.


...and without the volume:

[VanDerchuck]

Wow. Thanks guys. I'll try and verify both.

[VanDerchuck]

The first one can be marked verified. Only problem I ran into was cap size. A couple only span two rows and make for a very tight fit.

The second one I'll try and get to in the next few weeks. Alex, is there a schematic for that?

[Alex]

No schematic.
It's just a switch that changes the clipping between Mosfets/None/Germanium.
It should make it more versatile.

[VanDerchuck]

Derrr...

[Frank_NH]

This is probably common knowledge, but I use my needle nose pliers to bend the cap legs like this for two hole (0.1") spacing.

[VanDerchuck]

Frank_NH wrote

This is probably common knowledge, but I use my needle nose pliers to bend the cap legs like this for two hole (0.1") spacing.

Thanks Frank. I've done that in the past. I have the smaller caps for that reason.

Where in NH are you?

[Frank_NH]

I'm close to Dartmouth College, right next to the Connecticut River.  Lovely area.

Yeah, the reason I posted the pic is because we often have to bend legs to get things to fit.  I nearly always use box caps and get can those in good, slim sizes for values <= 220 nF.   Larger box caps need more real estate, as do larger electro caps.  Another technique I often use (and that some use on their veros) is to place components diagonally if there is free, connected hole adjacent to the original hole.  That works really well for the larger cylindrical electros.

[Hozy31]

Shouldn't the switch SPDT on-off-on?

[Alex]

Correct.
You could also use just half of a DPDT.

[Hozy31]

Thanks Alex,
So built the version with the Vol pot and SPDT switch and it works quite nicely but overall its a bit low on volume. How would I go about increasing it, larger Vol pot, change in resistor value?

[VanDerchuck]

The other layout is low in volume too. I think it's how the bias is set. It's based in the ZVex SHO, and that pedal has a ton of volume. I haven't played with the bias set up yet, but if I get around to it I'll share what I tried.