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Here’s a brief essay on modding a Phase 90 to add a depth control.
No offence intended, but the MBP Phase 90 has only a speed control and a colour switch. I wanted to see what effect one of Barry’s marvellous little Buff boards might have as an add-on depth control. I followed the build instructions but added a trimmer at R5 to have a finer degree of control over wet/dry balance. Glad I did, because this eventually helped in balancing the signals more precisely. The A100k pot in this case exhibited a spot where phase cancellations did seem to occur, signal level decreasing and other ‘out of phase’ symptoms. After googling pot tapers and other such esoteric stuff, I had a hunch that a C-taper pot might work better in this particular instance.
Long story short, it does seem to eliminate the hole in the middle of its log counterpart. So, here’s a modded Phase 90 (using Barry’s matched set of 2N5952s and the original 2N4125). Will box this up in due course, but heartily recommend the Buff ‘n’ Blend as a quick workaround for this particular aim. Naturally, YMMV. Thanks for reading.
this is one of my favorite effects to build and use. very nice execution man!
No offence intended, but the MBP Phase 90 has only a speed control and a colour switch. I wanted to see what effect one of Barry’s marvellous little Buff boards might have as an add-on depth control. I followed the build instructions but added a trimmer at R5 to have a finer degree of control over wet/dry balance. Glad I did, because this eventually helped in balancing the signals more precisely. The A100k pot in this case exhibited a spot where phase cancellations did seem to occur, signal level decreasing and other ‘out of phase’ symptoms. After googling pot tapers and other such esoteric stuff, I had a hunch that a C-taper pot might work better in this particular instance.
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