footswitching transistors

[Austin73]

Probably a really stupid question that has been answered a thousand times but anybody got ideas on using footswitch to toggle between two transistors ie low and high gain. I sort of get the idea with a 3PDT Swicth but would like LED indicators if poss dont want to go down the 4PDT but maybe millenium bypass indicators?

Cheers

Aus

[petemoore]

[/quote]ideas on using footswitch to toggle between two transistors ie low and high gain.
  >There are a number of ways that come under this generally..to be specific:
  >You mean switching between HG and LG transistors in the same circuit position, or
  >Switching the gain of a transistor in circuit?
  >Figuring out either/both can be done/
  I sort of get the idea with a 3PDT Swicth but would like LED indicators if poss dont want to go down the 4PDT but maybe millenium bypass indicators?
  > after Deciding what connections you need switched, an appropriate switch type can be chosen.   

[R.G.]

With silicon transistors, you can parallel the collectors and emitters, and switch the bases. The open base transistor(s) will be effectively open circuits, and only the base-driven transistor will be active. Other switch sections can drive LED, etc.

[Austin73]

Cheers R.G, Thats just what I wanted to hear. Will that work with a npn and a darlington fancy switching between 2n3904 and Mpsa13 in a Buzz Box type pedal

Aus

[Austin73]

Using ROG's Buzz Box layout and Bancika software badly I have quickly drawn this up as an example. If you look at the 2 transistors on the left  (2N3904  and MPSA13) if I wire between the cuts on the Base track would that work? (Yes I know the end cap is the wrong way round but can't do multiple undo's with the software!)

Aus

ROG Layout
http://www.home-wrecker.com/bazz.html

My crappy layout!

[Austin73]

[Austin73]

http://www.snapfish.co.uk/slideshow/AlbumID=42416300/PictureID=1246393144/a=29987928_29987928/t_=29987928

[Noplasticrobots]

R.G. your answer is so obvious it's making my head hurt. Why didn't I think of that?!??!