Author Topic: Using a 3PDT to switch between 2 transistors?  (Read 2105 times)

0 Members and 1 Guest are viewing this topic.

carrejans

Using a 3PDT to switch between 2 transistors?
« on: January 29, 2010, 04:40:13 PM »
Hi guys,

I was thinking, is it possible to switch between 2 different transitors in a circuit with a 3PDT?
Or will there be issues, doing it this way?

Thanks...

frequencycentral

  • Poster2
  • **
  • Posts: 4925
  • Total likes: 41
  • Kicking the sh!t of of your speakers since 2008
    • frequencycentral
Re: Using a 3PDT to switch between 2 transistors?
« Reply #1 on: January 29, 2010, 05:04:35 PM »
I'm pretty sure beavis has done this....................

caress

Re: Using a 3PDT to switch between 2 transistors?
« Reply #2 on: January 29, 2010, 06:57:18 PM »
same as doing it with a toggle, only you're stepping on it...

tcobretti

Re: Using a 3PDT to switch between 2 transistors?
« Reply #3 on: January 29, 2010, 11:00:19 PM »
I would imagine you'll get some crazy popping, so it may not be appropriate for the gig.

jacobyjd

Re: Using a 3PDT to switch between 2 transistors?
« Reply #4 on: January 29, 2010, 11:03:01 PM »
I wouldn't see a whole lot of value in making it a footswitchable parameter. a toggle is a fine idea though.
Warsaw, Indiana's poetic love rock band: http://www.bellwethermusic.net

Paul Marossy

Re: Using a 3PDT to switch between 2 transistors?
« Reply #5 on: January 30, 2010, 02:30:27 PM »
I would imagine you'll get some crazy popping, so it may not be appropriate for the gig.

Yeah, that was also my first thought.

I wouldn't see a whole lot of value in making it a footswitchable parameter. a toggle is a fine idea though.

I agree.

DaveM

Re: Using a 3PDT to switch between 2 transistors?
« Reply #6 on: January 30, 2010, 04:07:23 PM »
You only need a DPDT to switch between transistors, as you can keep the emitter (or base or collector, i'm not sure it would matter) of the two transistors connected all of the time.  I used a sub-mini toggle for switching, and the is a small pop, but nothing insane.  Here's the schematic of the FuzzFace clone I was switching transistors on. 

frank_p

Re: Using a 3PDT to switch between 2 transistors?
« Reply #7 on: January 30, 2010, 04:17:02 PM »

Using a 4pdt may be usefull if your Hfe are differents (you will need two more biasing resistors of different values).
See that topic:
http://www.diystompboxes.com/smfforum/index.php?topic=73259.0
« Last Edit: January 30, 2010, 04:19:18 PM by frank_p »

Paul Marossy

Re: Using a 3PDT to switch between 2 transistors?
« Reply #8 on: January 30, 2010, 09:35:28 PM »
I guess a small pop upon switching isn't too bad.

devi ever

Re: Using a 3PDT to switch between 2 transistors?
« Reply #9 on: January 30, 2010, 10:44:15 PM »
I guess a small pop upon switching isn't too bad.

Yeah... depends on the circuit and setup as well.

carrejans

Re: Using a 3PDT to switch between 2 transistors?
« Reply #10 on: February 01, 2010, 06:12:20 PM »
I wouldn't see a whole lot of value in making it a footswitchable parameter. a toggle is a fine idea though.
I agree.

Where did I mention that I want to use a footswitch?  ???

Thanks for the answers. Indeed a 4pdt is even better. Thanks for that idea!!!

caress

Re: Using a 3PDT to switch between 2 transistors?
« Reply #11 on: February 01, 2010, 09:53:08 PM »
Where did I mention that I want to use a footswitch?  ???

lol not sure why i thought that!  sorry...   :D