madbeanpedals::forum

Projects => Build Reports => Topic started by: marauder on April 28, 2013, 10:01:38 AM

Title: Tonebender Mk. III
Post by: marauder on April 28, 2013, 10:01:38 AM
More mojo than ever.  In fact too much, as the board is incredibly tight with the axial 220nf caps.

Made to the same spec as a DAM FS-75, using Mullard OC44, OC71, and a Japanese germ as there's no Mullards left with the right gain for Q3.

Sounds great, louder than a straight mk. III clone.

ColesBD's enclosure is stunning in the flesh, no decal required.

(http://www.maccentral.demon.co.uk/pedals/mk3-1.jpg)

(http://www.maccentral.demon.co.uk/pedals/mk3-2.jpg)
Title: Re: Tonebender Mk. III
Post by: gingataff on April 28, 2013, 11:53:01 AM
Mains insulation on the transistors? Too cool ;D
Title: Re: Tonebender Mk. III
Post by: marauder on April 28, 2013, 01:10:52 PM
Quote from: gingataff on April 28, 2013, 11:53:01 AM
Mains insulation on the transistors? Too cool ;D


Yeah, I had to extend the legs on the transistors, and couldn't use thinner insulation.  It follows some logic which colour relates to which leg.
Title: Re: Tonebender Mk. III
Post by: gingataff on April 28, 2013, 03:29:58 PM
Do you ground to the chassis when using insulated jacks?

I've used them on a couple of pedals without grounding and so far no nasties but I do wonder if I should drill a hole for a crimp terminal or something.
Title: Re: Tonebender Mk. III
Post by: nzCdog on April 28, 2013, 03:39:51 PM
Very nice build! Enclosure looks great. Is that an opamp buffer tucked away in there? 
Title: Re: Tonebender Mk. III
Post by: marauder on April 28, 2013, 04:34:44 PM
Case is grounded through a pot casing.

The IC is a charge pump, so it all runs nicely with -9V.