Building a clipping selector mod

Started by Ocoaibass, March 06, 2012, 11:42:20 AM

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Ocoaibass

If I wire an On/Off/On DPDT toggle selector (with LEDs on one side & nothing on the other) to diodes on a PCB instead of removing them, will I end up with On(nothing)/Off(stock diodes)/On(LEDs) or will I get On/(stock diodes)/Off(stock diodes)/On(diodes & LEDs)?

Does that question make sense?

RatBrat


Ocoaibass

Yeah, I don't want to pull the diodes only to have to reconnect them to the toggle switch. I know I could, but less work is smarter work.

Le québécois

Quote from: Ocoaibass on March 06, 2012, 11:42:20 AM
will I get On/(stock diodes)/Off(stock diodes)/On(diodes & LEDs)?

If i'm not mistaken, you will have this but because forward volatge of diode is lower than LED, this will have no effect since when the signal will reach diode Fv they will open and shunt everything higher to ground. It will never reach the LED threshold (1.6v).
To break the circuit and change the properties of it, you need to unsolder it to physically break it. It is therefore best to unsolder half of the diode and connect it to the switch.  If you really don't want to unsolder, you can cut the trace before and after the diode drill a hole on both side of the cut on the pcb and wire your switch so you connect the diode back or replace them wth LED.

  first circuit part ----wire ---   cut -------   wire ----diode -------wire  --- cut ---- wire -------next part of the circuit
                                 |                             |                       |                         |
                                 |-------------------------|-----switch-------|----------------------|
                                                               |                       |
                                                                ------ LED----------

there is many way to do it and probably one that require only one cut on the board but my brain is frozen and I can'T figure it at the moment... other may help.

Ocoaibass

I think I'll pull the diodes. I'd like to avoid cutting traces & drilling just yet. This is a mod project, not a byo. Thanks for the help.

Mark Hammer

I get the faint sense that you want to select between LED-based clipping, Si diode clipping, and no diodes.

If so, here's what you do.  BOTH sets of diodes are installed, but one side of each diode pair is left "hanging".  The toggle is wired to have the common tied to ground (or wherever the diodes need to go to do what they do)  One outside toggle contact goes to the free end of one diode pair, and the other outside lug goes to the free end ofthe other diode pair.  In the middle no contact is made and neither diode pairis having an effect.

Ocoaibass

Quote from: Mark Hammer on March 06, 2012, 03:06:59 PM
I get the faint sense that you want to select between LED-based clipping, Si diode clipping, and no diodes.

If so, here's what you do.  BOTH sets of diodes are installed, but one side of each diode pair is left "hanging".  The toggle is wired to have the common tied to ground (or wherever the diodes need to go to do what they do)  One outside toggle contact goes to the free end of one diode pair, and the other outside lug goes to the free end ofthe other diode pair.  In the middle no contact is made and neither diode pairis having an effect.

Sounds like it makes sense, but I'm going to do the boring normal way so I don't screw it up. Good brains on that one, though. If I understand correctly, that would work.