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DIY Stompboxes => Building your own stompbox => Topic started by: tacobender on December 30, 2015, 11:09:12 PM

Title: external bias recomendations?
Post by: tacobender on December 30, 2015, 11:09:12 PM
Anyone have a recommendation for an external bias, I hear 10k to replace the 8.2k. I really dig the one ramble FX uses but its not labled, and can find anything about it online. So should I use 10k or 20k, audio- linear or what? I'm interested in what results any of you may have had. Thanks.
Title: Re: external bias recomendations?
Post by: mth5044 on December 30, 2015, 11:40:59 PM
Annnnd you're talking about what circuit?
Title: Re: external bias recomendations?
Post by: thehallofshields on December 31, 2015, 01:50:17 AM
Quote from: mth5044 on December 30, 2015, 11:40:59 PM
Annnnd you're talking about what circuit?

Welcome to the DIY Fuzz Face forum.

You've got a Germanium Transistor? 10k Linear is fine. If you want to get broken sounds you can use a 25k or higher.
Better yet, get some Alligator Clips and try out a few different values.

And read this article: http://www.geofex.com/article_folders/fuzzface/fffram.htm (http://www.geofex.com/article_folders/fuzzface/fffram.htm)
Title: Re: external bias recomendations?
Post by: Electric Warrior on December 31, 2015, 05:40:15 AM
If you really need an external bias pot, replace the 33k. It sets the bias for both transistors.
Title: Re: external bias recomendations?
Post by: induction on December 31, 2015, 09:45:07 AM
Here's (http://www.diystompboxes.com/smfforum/index.php?topic=103163.msg917847#msg917847) how I did it with piggybacked Si transistors.
Title: Re: external bias recomendations?
Post by: tacobender on December 31, 2015, 06:20:46 PM
Quote from: induction on December 31, 2015, 09:45:07 AM
Here's (http://www.diystompboxes.com/smfforum/index.php?topic=103163.msg917847#msg917847) how I did it with piggybacked Si transistors.
that's just about what I was thinking, only I didn't think of the 1k resistor on the third lug. I'm gona try it on a few different circuits. So I guess 25k linear will be my huckleberry. Thanks guys.