This Week on the Breadboard: Phase 90
- Thread starter Chuck D. Bones
- Start date
finebyfine
Well-known member
Ooph and I was hoping you hadn’t hidden the ground ratlines. That’s a doozie
Chuck D. Bones
Circuit Wizard
Good catch. Schematic in post #72 corrected.
Fingolfen
Well-known member
I really need to get this one breadboarded, but I was looking at the schematic and comparing it to the vanilla Phase 90, and noticed something.
Tracing from the audio signal in through to IC1A - it's going into pin 2 (-) on this schematic, but on the standard Phase 90 it goes into pin 3 (+)... granted, going through all of the ICs both the "A" and "B" pin attachments seem to be similarly reversed. Was this intentional?
Tracing from the audio signal in through to IC1A - it's going into pin 2 (-) on this schematic, but on the standard Phase 90 it goes into pin 3 (+)... granted, going through all of the ICs both the "A" and "B" pin attachments seem to be similarly reversed. Was this intentional?
Chuck D. Bones
Circuit Wizard
Schematics in posts #72 and #83 have errors.
I just now corrected post #72. IC2A & IC3A were drawn upside down in the previous version.
I just now corrected post #72. IC2A & IC3A were drawn upside down in the previous version.
Chuck D. Bones
Circuit Wizard
Not any more. Thanks again for pointing it out.
MBFX
Well-known member
@Chuck D. Bones Just coming by to say how impressive it is that you know how to do this stuff. I feel like a wizard knowing how to read basic boost schematics and breadboard them, but this is the kind of stuff I really want to learn and be doing. Thanks for all the help so far! I would have quit this hobby if you and @BuddytheReow and @Feral Feline hadn't taken the time to answer my questions.
cooder
Well-known member
Well I think we all win then...
While I originally thought my build report might be in January 2024 or 2025 it turns out somewhere in the golden middle...
Here's the "Phases of the Moon", sounds and works excellent and the footswitch juuuust fitted in there, geeeez it's a bit tight, she said, but fun and all worth it
Great soundz and variety, love having a Depth control and the Colour has great shades of phaseygoodiness.
Great circuit work and Chuck held my hand getting the J113 jfets to work in there and what to watch for when selecting a quad with the fab jfet tester from here:
https://forum.pedalpcb.com/threads/why-are-jfets-such-a-pain-in-the-ass.4878/post-219671
(note: there's a wee mistake in the schematic of that tester, I can post an update if someone wants it, easy enough to spot anyway).
So it's great to know that we can get this working with still readily available in production jfets. I tested about 80 pieces of J113 sourced from Mouser and found a bunch of tightly matched quads.
Anyway, enough fluffing around, here's the swirly goods:
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Chuck D. Bones
Circuit Wizard
Great job Cooder!
cooder
Well-known member
Nah nah; great job on the shematic and circuit tweaking Sir @Chuck D. Bones !
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