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
[/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.
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.
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
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 (http://www.home-wrecker.com/bazz.html)
My crappy layout!
(http://www.snapfish.co.uk/slideshow/AlbumID=42416300/PictureID=1246393144/a=29987928_29987928/t_=29987928)
(http://www.snapfish.co.uk/slideshow/AlbumID=42416300/PictureID=1246393144/a=29987928_29987928/t_=29987928)
(http://www.snapfish.co.uk/slideshow/AlbumID=42416300/PictureID=1246393144/a=29987928_29987928/t_=29987928)
http://www.snapfish.co.uk/slideshow/AlbumID=42416300/PictureID=1246393144/a=29987928_29987928/t_=29987928 (http://www.snapfish.co.uk/slideshow/AlbumID=42416300/PictureID=1246393144/a=29987928_29987928/t_=29987928)
R.G. your answer is so obvious it's making my head hurt. Why didn't I think of that?!??!