Layout for diodes switch needed...

[Renegadrian]

I read in some topics that a nice and easy mod would be adding a switch to go from Si to LEDs or Ge or...
I tried the search button, but found nothing clear...

Let's say we should add a simple DPDT switch to the popular dod 250, how would you wire a couple of Si and a couple of LEDS (so it's an easy 2 pos. mod, no rotaries involved...) to the switch and back to the PCB!? 
Any input appreciated...Sorry for noob question...

[andrew_k]

[Renegadrian]

Thx for the input Andrew...But how to wire it properly on this diagram?! 



It's the 250 (Bill Lawrence) but obviously it's the common diode layout, with the four holes and the two diodes side by side in their alternate direction. I numbered the diodes holes for ease...
So the diodes - LEDs are to be connected in parallel, I see...
THX for your help, I appreciate it...

[MarcoMike]

the central lugs of the switch go to holes 1(or2) and 3(or4)

or you can use a spdt switch: all diodes connected to 3(or4) and the switch selects which pair to connect to 1(or2)
1______
            |
       SWITCH
         /       \
       ||        ||
       AV      AV
       ||        ||
3^{-----------------}

A and V are diodes (wasn't it clear?!?)

[Renegadrian]

Grazie Marco!!! 
So it would be like this?! Am I right!? (Well, I'm left anyway...) <---sorry for being silly...

[Renegadrian]

Another silly question...Do the LEDs light up when engaged?

[sevenisthenumber]

It depends on the circuit if they light up. Some do, some dont.

[Dragonfly]

That drawing looks familiar...

hmmm...where have I seen that before ?

[Renegadrian]

LOL butyou didn't draw the clipping diode switch...I just messed with your drawing...And here it is...
Feel entitled to put it in your album then!!! 

[RickL]

If all you want to do is switch between two pairs of diodes you can do it with a spst switch. Put the diodes with the highest threshold on the board, run a wire from the 1/2 node to one lug of the switch, another wire from the 3/4 node to one end of the other back-to-back pair of diodes and a third wire from the other end of the diodes to the second lug of the switch.

Put another way, wire two sets of diodes in parallel with a switch to break the connection on one end of the diodes with the lowest threshold.

[Renegadrian]

'Right, THX for the input!!!

[Dragonfly]

LOL butyou didn't draw the clipping diode switch...I just messed with your drawing...And here it is...
Feel entitled to put it in your album then!!! 

must be a "language barrier" thing, because that drawing IS, and HAS BEEN the clipping switch !  Its the bottom side of a DPDT switch with the diode attachments pictured.....

[Renegadrian]

Sure, Dragonfly, a little misunderstanding on words...BTW your switch change diodes in symm/asymm, while I meant to switch between two pairs of different diodes (Si/LEDS) - the same switch doing two different things, isn't it!?

Anyway, now diodes switching (the way I intended when I started this thread and now the symm/asymm thing too) is a stranger in more!!!Ahah 
OK time to go BANZAI for the things I need...

Thank you for all your layouts, I studied them and learned some...

[Dragonfly]

Sure, Dragonfly, a little misunderstanding on words...BTW your switch change diodes in symm/asymm, while I meant to switch between two pairs of different diodes (Si/LEDS) - the same switch doing two different things, isn't it!?

Anyway, now diodes switching (the way I intended when I started this thread and now the symm/asymm thing too) is a stranger in more!!!Ahah 
OK time to go BANZAI for the things I need...

Thank you for all your layouts, I studied them and learned some...

ahh..i understand ! 

[andrew_k]

That drawing looks familiar...

hmmm...where have I seen that before ?

That's why I linked the image to its place in your gallery when I posted it 

[Renegadrian]

... you can use a spdt switch: all diodes connected to 3(or4) and the switch selects which pair to connect to 1(or2)
1______
            |
       SWITCH
         /       \
       ||        ||
       AV      AV
       ||        ||
3^{-----------------}

Marco, you mean something like this...


This is from Beavis site (DANO) - The lower part of his drawing should follow the same thing you say - one end of all 4 diodes goes to the pcb and the other end of the diodes are soldered by pairs on the outer lugs of the SPDT, while the middle lug goes to ground...Am I correct?!