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DIY Stompboxes => Building your own stompbox => Topic started by: stoneattic on March 23, 2013, 10:56:06 AM

Title: Is it "safe" to jumper around an FET switch?
Post by: stoneattic on March 23, 2013, 10:56:06 AM
Don't laugh...

I'm true bypassing a certain manufacture's pedal that I don't want to mention for fear of ridicule. The switching on this particular pedal is done with SMD transistors, specifically a pair of 2SK880GR, instead of the usual TO-92 package that I've seen in their other, older pedals.  I'm a bit worried about removing the FET for fear of damaging the PCB and was thinking that it would be easier to just put a jumper from the Source to the Drain to keep it passing signal.  

Does anyone know if that might cause a problem?

Thanks!
Title: Re: Is it "safe" to jumper around an FET switch?
Post by: R.G. on March 23, 2013, 11:16:34 AM
It's fine if what you want is that it act like the JFET is always 'on'.
Title: Re: Is it "safe" to jumper around an FET switch?
Post by: stoneattic on March 23, 2013, 11:23:20 AM
That's exactly want I want.  Thanks!

Not that I care about the FET itself, but I wanted to be sure it wouldn't cause any damage.
Title: Re: Is it "safe" to jumper around an FET switch?
Post by: armdnrdy on March 23, 2013, 11:30:43 AM
Quote from: stoneattic on March 23, 2013, 10:56:06 AM
Don't laugh...

I'm true bypassing a certain manufacture's pedal that I don't want to mention for fear of ridicule.


Is the pedal you're working on one of these?

http://www.aronnelson.com/gallery/main.php/v/diyuser/Boss+Talent+Simulator.jpg.html

http://www.aronnelson.com/gallery/main.php/v/diyuser/Blame+Shifter.jpg.html

http://www.aronnelson.com/gallery/main.php/v/diyuser/Boss_TalentBooster.jpg.html
Title: Re: Is it "safe" to jumper around an FET switch?
Post by: stoneattic on March 24, 2013, 10:38:01 AM
If only they existed.  I would be happy with just a suck reduction knob.

I finished the true bypass and all is good.  The leads on the SMB FETs were so close I just put enough solder to cover both pads. 
Title: Re: Is it "safe" to jumper around an FET switch?
Post by: duck_arse on March 25, 2013, 10:03:49 AM
*is it safe?*

I've got a root canal scheduled for thursday morning. IT CAN"T COME SOON ENOUGH.

sorry for hi-jack