Erik S
Well-known member
The Duophase came together last night. Everything worked great apart from one pretty embarrassing noob mistake. Turns out I had no idea what a switched jack was. Somehow I just glossed over that detail, saw the number of lugs and thought I could use a regular trs stereo jack. Makes no sense once I thought through the signal path, but now that’s what’s in there.
It worked right away as two independent phasers, but no 2 in 1, since there’s no functional jumper between the two.
Side note - all the switched jacks I see are closed frame… Ideally I’d like to have an open frame one that matched the other jacks, are those not a thing for some reason?
Once I understood my mistake I connected an alligator clip jumper between the tip and ring lugs on the stereo jack, and got the whole super-phaser thing happening. Pretty awesome, but I couldn’t close up the enclosure.
The temporary workaround I came up with until I can get my hands on a switched jack was to sacrifice a 1/4 - 3.5mm headphone adapter. I cut out the plastic insulation between the tip and ring, and jumped the gap with solder. Now if I plug that adapter into the TRS jack, it jumps the tip to the ring, and I’m in business.
Why do I have knobs where the LDRs should be? @Betty Wont suggested some kind of light shield so the light from one side doesn’t get picked up on the other side. Those crappy tayda knobs were about the right diameter, so they got bored out on a lathe, notched to clear the upper ICs and hot glued to the board.
EDIT: just looked again and found some switchcraft open frame switched jacks on Amazon and ordered them. Hopefully they come soon so I can ditch the adapter of shame.
It worked right away as two independent phasers, but no 2 in 1, since there’s no functional jumper between the two.
Side note - all the switched jacks I see are closed frame… Ideally I’d like to have an open frame one that matched the other jacks, are those not a thing for some reason?
Once I understood my mistake I connected an alligator clip jumper between the tip and ring lugs on the stereo jack, and got the whole super-phaser thing happening. Pretty awesome, but I couldn’t close up the enclosure.
The temporary workaround I came up with until I can get my hands on a switched jack was to sacrifice a 1/4 - 3.5mm headphone adapter. I cut out the plastic insulation between the tip and ring, and jumped the gap with solder. Now if I plug that adapter into the TRS jack, it jumps the tip to the ring, and I’m in business.
Why do I have knobs where the LDRs should be? @Betty Wont suggested some kind of light shield so the light from one side doesn’t get picked up on the other side. Those crappy tayda knobs were about the right diameter, so they got bored out on a lathe, notched to clear the upper ICs and hot glued to the board.
EDIT: just looked again and found some switchcraft open frame switched jacks on Amazon and ordered them. Hopefully they come soon so I can ditch the adapter of shame.
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