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Title: Mosfet Boost with bass roll-off
Post by: Jun on February 23, 2004, 03:49:23 PM

I'm currently using piezo ceramic discs to amplify my acoustic guitars but there is an annoying bump at about 100-200 Hz. Also the output is quite low so I would like to build a Mosfet Boost with some sort of variable bass roll-off. What are some low part count suggestions.
Thanks,
Jun

Title: Mosfet Boost with bass roll-off
Post by: Jun on February 23, 2004, 09:17:22 PM

Would a 'varitone' type circuit work for this?
Jun

Title: Mosfet Boost
Post by: petemoore on February 23, 2004, 09:48:02 PM

Great build for those who have not yet.
Check out the links...Geo, AMZ, capacitors in the signal path can roll of lows, try different [smaller] values

Title: Mosfet Boost with bass roll-off
Post by: Alpha579 on February 23, 2004, 11:02:09 PM

Does it have to be MOSfet? If yes, i guess you could stick a variable low pass filter before the AMZ MOSfet booster. If no, there are tones of small BJT/FET boosters with low parts count.

Title: Mosfet Boost with bass roll-off
Post by: Jun on February 23, 2004, 11:40:32 PM

Thanks for the tip Pete.
I would like to build the Mosfet Boost since I've read so much about it being a great non-coloring boost on this forum.
By 'low part count' I was referring to the tone section. I didn't want to add a parametric eq but something passive like this:

http://www.muzique.com/lab/tone3.htm

Would the version 2 AMZ control work after the Mosfet Boost?
Jun

Title: Mosfet Boost with bass roll-off
Post by: Jun on February 24, 2004, 02:15:26 AM

I just found the filter calculator
http://www.muzique.com/schem/filter.htm
I'm gonna try a pot and cap after the Mos Boo.
Thanks,
Jun

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DIY Stompboxes => Building your own stompbox => Topic started by: Jun on February 23, 2004, 03:49:23 PM