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Mangler - Smallbear germ. & resistor placement

Started by dont-tase-me-bro, April 26, 2014, 03:33:48 AM

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dont-tase-me-bro

I have received a nice set of Mullard germaniums from Small Bear, but I'm not sure if his resistor values correlate directly to the Mangler.  I looked through some old threads, but couldn't find a definitive answer.  Does R3 = R3, etc?

Small Bear says
R3 - 22K
R4 - 680 ohms
R5 - 11K
R6 - 110K

Madbean says
R3 - 220 ohms
R4 - 470 ohms
R5 - 47 ohms
R6 - 4.7K

The Small Bear package says
Q1
87, L = 229
Q2
103, L = 264

I tried using this thing, but can't figure it out.

http://www.diystompboxes.com/biascalc/bmbias.html

Thanks
I thought this would save me money.

dont-tase-me-bro

I think I may need to take some macro shots of them before they go in.  They kind of look cool.
I thought this would save me money.

dont-tase-me-bro

Still confused.

On the bear face page:

"Clean-up pot R2 is optional."

On the fur face page:

"The only other thing I added was a 1 Meg resistor from input to ground to reduce "pop" noise from the stomp switch."

R1 on small bear's pedal is a 1 meg
I thought this would save me money.

brucer

Small Bear's resistor numbers are shown on their Bear Face schematic (see https://www.smallbearelec.com/Projects/BearFace/BearFace.htm).  You need to compare that with the Mangler schematic to figure out what resistor goes where.  I worked through it and it turned out fine using the following pairs:

Small Bear Resistor # = Madbean Resistor #
R3=R2
R4=R4
R5=R3
R6=R1

However, I jumpered Madbean's R3 and used only the 10K trim pot to get the correct bias point.

Hope that helps.

dont-tase-me-bro

I thought this would save me money.