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new05002
PostPosted: Sat Sep 24, 2011 11:15 am 
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First post here,

Do you think it would be possible to install a phase switch on the Amp Selector & Stereo FX Router Kit by swapping the leads of secondary of channel B's isolation transformer? I could move the isolation switch over to a on off on switch so that I could put a DPDT mini switch next to it to swap the leads on the secondary. If anyone has comments please let me know if this will achieve what I want it to.

Thanks

Nick
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Morgan
PostPosted: Mon Oct 24, 2011 2:29 pm 
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Hi Nick - welcome to the forum! :D

byoc wrote:
FYI, there's a bonus phase invertion mod built into the PCB. Where is says 103 or 104, you'd stick a 10k or 100k resistor. You'll need a SPDT switch. "P" connects to the Pole. T1 connects to one throw and T2 connects to the other. There's a trace that connects between P an T1 on the top of the PCB. You'd cut that trace.


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Like_A_Boss
PostPosted: Wed Mar 14, 2012 1:52 pm 
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Morgan wrote:
Hi Nick - welcome to the forum! :D

byoc wrote:
FYI, there's a bonus phase invertion mod built into the PCB. Where is says 103 or 104, you'd stick a 10k or 100k resistor. You'll need a SPDT switch. "P" connects to the Pole. T1 connects to one throw and T2 connects to the other. There's a trace that connects between P an T1 on the top of the PCB. You'd cut that trace.


hello I'm trying to understand the phase mod. Could you explain the process for the mod in lame terms? I'm a noob, sorry :?:

am I suposed to replace 103 with a 10k resistor or am I supposed to replace 104 with a 100k resistor? or both? what will the difference be? what does "throw" mean? please help.

I've built a digital delay and ping pong and shredder pedal before so I'm not that bad I guess.
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Morgan
PostPosted: Wed Mar 14, 2012 2:27 pm 
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Like_A_Boss wrote:
am I suposed to replace 103 with a 10k resistor or am I supposed to replace 104 with a 100k resistor? or both? what will the difference be? what does "throw" mean? please help.

You'd do both; add a 10k resistor to the 103 spot and a 100k to the 104 spots (there are two of them - one for each spot). The resistors would be standing on end it looks like. A SPDT toggle switch (single pole double throw) has one column of 3 solder lugs. The center lug is the pole and the throws are the two outer lugs.

Without having a pcb here, I can't trace this mod to see what it's doing, but I believe that it inverts the phase of IC2a.

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Like_A_Boss
PostPosted: Wed Mar 14, 2012 3:03 pm 
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Morgan wrote:
Like_A_Boss wrote:
am I suposed to replace 103 with a 10k resistor or am I supposed to replace 104 with a 100k resistor? or both? what will the difference be? what does "throw" mean? please help.

You'd do both; add a 10k resistor to the 103 spot and a 100k to the 104 spots (there are two of them - one for each spot). The resistors would be standing on end it looks like. A SPDT toggle switch (single pole double throw) has one column of 3 solder lugs. The center lug is the pole and the throws are the two outer lugs.

Without having a pcb here, I can't trace this mod to see what it's doing, but I believe that it inverts the phase of IC2a.


I've just ordered the amp selector kit ill post pictures of the pcb as soon as I'm done with the original wiring
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Like_A_Boss
PostPosted: Sat Mar 24, 2012 12:36 am 
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Morgan wrote:
Like_A_Boss wrote:
am I suposed to replace 103 with a 10k resistor or am I supposed to replace 104 with a 100k resistor? or both? what will the difference be? what does "throw" mean? please help.

You'd do both; add a 10k resistor to the 103 spot and a 100k to the 104 spots (there are two of them - one for each spot). The resistors would be standing on end it looks like. A SPDT toggle switch (single pole double throw) has one column of 3 solder lugs. The center lug is the pole and the throws are the two outer lugs.

Without having a pcb here, I can't trace this mod to see what it's doing, but I believe that it inverts the phase of IC2a.


here are some pictures of the pcb front, back, and with components.

Image
Image
Image
Image
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Stephen
PostPosted: Sat Mar 24, 2012 4:23 am 
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Like_A_Boss wrote:
am I suposed to replace 103 with a 10k resistor or am I supposed to replace 104 with a 100k resistor? or both? what will the difference be? what does "throw" mean? please help.

103 = 10 with 3 zeroes = 10,000 = 10K

104 = 10 with 4 zeroes = 100,000 - 100K

A SPDT switch has one POLE and two THROWS. The POLE is the center lug of the switch. The THROWS are the lugs above and below the POLE lug.

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