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Topic: Small Time: PT2399 Delay with tails (Read 5900 times)
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merlinb
Posts: 789
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Just did a vero layout for this project:  |
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Colonel Angus
Posts: 305
Brian M. - Cincinnasty, OH
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Nice work!! That is Back to the Future BTW...  |
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Why should you not have 90o angles? Do the electrons bunch up in the corners?
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azrael
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Any demos of this design? I thought it was pretty cool, so I designed a PCB for it, should be here soon.  Maybe I'll make a video once I learn how to play guitar haha |
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John Lyons
Posts: 5613
Basic Audio
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Any demos of this design? First page, first link.
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azrael
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Yes, I've seen that one. I wanted to see some videos with some people twiddling knobs as the demo goes, John. |
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John Lyons
Posts: 5613
Basic Audio
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Ah, ok, gotcha.  I built one and it's quite nice. Very tame with no self oscillation as stock but the sound was nice. No clips though.  |
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bluebunny
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Built this today (see Pictures thread for evidence) and I really like it - thanks Merlin!  A small "however"... I noticed that if I hit a loud note when it's bypassed, signal still gets through to the delay, but very distorted (and pretty quiet). Sounds like the FET is never fully off. Anyone else come across this? Double-checked the circuit vs. layout and everything's fine and dandy. The FET is definitely a J112 (according to the markings on it - and it came from a reputable source) and is otherwise doing its switching duty. |
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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Slade
Posts: 811
Fernando R. from Chile
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Hey, Merlin, thanks for sharing the design.
Is it possible to add just the tails circuit to other PT based delays?
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« Last Edit: November 20, 2012, 02:20:00 PM by Slade »
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merlinb
Posts: 789
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Is it possible to add just the tails circuit to other PT based delays?
Yes, it's just a generic FET analog switching circuit, so it could be applied to other circuits fairly easily. |
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azrael
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Just built one, couldn't get it to delay until I grounded pin 4. Thoughts on connecting dGND to ground?
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bluebunny
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Interesting. Pin 4 is connected to ground (at pin 3), albeit through a small (~10 ohm) resistor. This according to some handy PT2399 notes prepared by Merlin.
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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azrael
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Yeap, I'm aware of that, that's why I was a bit confused.
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merlinb
Posts: 789
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Yeap, I'm aware of that, that's why I was a bit confused.
Maybe the internal resistor burnt out? Lots of people report weird issues with the PT2399, often attributed to fake parts. I've not yet experienced it myself. Anyway, you can ground both Agnd and Dgnd pins, it doesn't really make any big difference to performance. |
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phizone
Posts: 20
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I finished breadboarding this last night and although I haven't had a chance to try it at volume it sounds great so far. However, I used the BOM from the vero layout to pull parts and I noticed some oddities between the BOM and the schematic. These aren't showstoppers, but I wanted to note them here for future builders just in case they are ordering parts based on the vero BOM. Only the 3rd item would actually be an issue... - C9 is listed in the BOM twice.
- C19 is listed as 47uF in the BOM, but as 100uF in the schematic.
- D2 is listed as an LED in the BOM, but as a 1N4001 in the schematic. The graphic for D2 in the vero is correctly shown as a normal diode rather than LED. It also seems to be oriented from +9v to ground rather than inline like it is in the schematic.
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