How to add a switch between 4 different- any diagrams or pics

[jimbob]

I had seen here a while back where someone made a switch/'s to switch between 1)Ge for a  "squishy", "tubey", "compressed". 2) Si for "sharp", "focused","tight", "precise" 3)  FETs/MOSFETs = "Tube-like", "Crunchy" 4) LEDs for"Crunch", "Buzz", "Less Compressed". What I cant figure out is how this was wired. I want to do this for a dod-250. I have a 5p2t switch from the ratshack i want to use to switch between the different types. It looks like according to GGG's dod-250 he has a switch in his pic but not on his layout. Can anyone explain how I might do this adventurous move? heres what im using:

I think this would be something MANY people would like to know how to do.

[comfortably_numb]

You could possibly try a 4 or 5 position rotary switch?

[jimbob]

Or- how would you wire a switch to just switch between 2 different types -lets say silicon and germs?

[comfortably_numb]

This can be done with a simple SPST.  Wire your diodes to ground, but connect them to signal with the switch.  Connect the center lug to the signal, and the two outer lugs to each diode set respectively.  So in position one, Si diodes are connected from signal, via the switch, to ground, and in position two, Ge diodes are connected from signal to ground.  You could use a "center off" switch that takes both out of the signal altogether as well.  Keep in mind, you Ge diodes are going to give you a good bit less output than the Si's.  Just be aware.

[petemoore]

  Crmeiiong I think Single pole + Single Throw = two lugs.
  You can however use a SPST to switch between diodes, connect the lowest clipping threshold diode configuration through the switch, they'll conduct and clip 'first' [the higher threshold will do nothing], when disengaged the higher threshold diodes [soldered or..] will then get to see signal and clip.

[jimbob]

So you could place 1 wire before one leg of the d2 on the layout above to a leg of a switch that has a pair of "lets say red led's" and another wire going from the switch to the ground? Would this be a spst? According to this pic he used a spdt. How did he wire this? Hes switching between a 1n914's and red leds.



this is a pic from GGG's site.

[comfortably_numb]

Sorry about that.  I meant spdt.  Here's a pic of how it would look on a schematic, and a rough layout equivalent.



Pete has a good point about the spst though.  If you connect the Si diodes directly to the signal, permanantly, and then the Ge diodes two an spst switch (like half of the diagram above) then when the Ge's are switched in, the signal won't get high enough to clip the LEDs.

[jimbob]

comfortably_num- great diagram! makes sense. Im going w the spdt to start off with.

thanks

James