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Gyrator Help

Started by soupbone, October 20, 2012, 04:23:18 PM

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soupbone

I'm having a little trouble finding where the gyrators are for some boss pedals.I talked to dirk hendrick and he told me for the bd-2 blues driver the gyrator circuit was based around Q7 and to remove C9,and that would take the gyrator out of that pedal.Here's a couple of other pedals that i don't have a clue where the gyrators are,and which cap to remove?Here's some schematics;DS-2= http://experimentalistsanonymous.com/diy/Schematics/Distortion%20Boost%20and%20Overdrive/BOSS%20DS-2.gif   OD-3= http://www.freeinfosociety.com/electronics/schematics/audio/pictures/bossod3.gif                                                                                                                                           MT-2= http://www.hobby-hour.com/electronics/s/boss-mt2-metal-zone.php  HM-2= http://www.hobby-hour.com/electronics/s/hm2-heavy-metal.php

PRR

> where the gyrators are for some boss pedals

Not all Boss pedals have gyrators.

And why do you want to clobber them?

Easy to learn the pattern. Gyrator is an emitter follower (or unity-gain opamp) with two caps to the base and a low-value resistor from emitter to between the caps. Lifting one leg of the futher cap kills the ring.

DS-2 - no gyrator (Q23 is a low-pass filter with mild ring)

MT-2 - Q010 Q008 Q007 are the gyrators, C034 C024 C020 are targets.

HM-2 - IC 3B 2A 2B are the gyrators; but leaving the Color pots centered cancels their effect.
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soupbone

Quote from: PRR on October 20, 2012, 10:14:26 PM
> where the gyrators are for some boss pedals

Not all Boss pedals have gyrators.

And why do you want to clobber them?

Easy to learn the pattern. Gyrator is an emitter follower (or unity-gain opamp) with two caps to the base and a low-value resistor from emitter to between the caps. Lifting one leg of the futher cap kills the ring.

DS-2 - no gyrator (Q23 is a low-pass filter with mild ring)

MT-2 - Q010 Q008 Q007 are the gyrators, C034 C024 C020 are targets.

HM-2 - IC 3B 2A 2B are the gyrators; but leaving the Color pots centered cancels their effect.
Ok.I think I'm catching on.So,would the gyrators for the Boss OD-3 be C34-C35?(p.s.thanks for your help!)