Print Page - Hipster - BIAS trimpot

Title: Hipster - BIAS trimpot
Post by: mcalaff on November 27, 2013, 10:27:45 PM

Hi,

recently I made a Hipster Fuzz Face.

I have signal only adjusting the bias trimpot at top left. Can I turn it a little to right, but only a "micro step" before losing signal. So I must have a 95% of trimpot wasted.

The maximum voltage in my case is 4.1V and the minimum 3.9V.

This is normal? I do not know if I could get better sound

I checked the values of resistors and caps. and all is ok.

I use BC108B transistors.

Thanks!

Title: Re: Hipster - BIAS trimpot
Post by: alanp on November 28, 2013, 04:25:20 AM

Have you tried other transistors? I found that circuit REALLY varied with different transistors in it.

Title: Re: Hipster - BIAS trimpot
Post by: mcalaff on November 28, 2013, 10:17:45 AM

Now I make a test with 2n3904 and 2n5088.

With 2n3904 can I adjust well the bias but it sounds with low volume.

With 2n5088 can I adjust well the bias, the volume is good but the sound is not impressive for me.

I will do more tests.

Title: Re: Hipster - BIAS trimpot
Post by: midwayfair on November 28, 2013, 04:06:19 PM

Check that your transistor isn't backwards.

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Projects => General Questions => Topic started by: mcalaff on November 27, 2013, 10:27:45 PM