|HOME| |DIY FAQ| |GEO FAQ| |Debugging Page| |Links| |Schematics| |Wiki| |Layouts Gallery| |STORE|
|AMPAGE| |GEOFEX| |AMZ|

Welcome, Guest. Please login or register.
Did you miss your activation email?
April 19, 2014, 02:53:10 PM
945911 Posts in 101581 Topics by 31688 Members
Latest Member: dataplex
Home Help Login Register
DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Small Time: PT2399 Delay with tails 0 Members and 1 Guest are viewing this topic. « previous next »
Pages: 1 [2] Go Down Print
Author Topic: Small Time: PT2399 Delay with tails  (Read 8729 times)
merlinb
Posts: 1027


Merlin, Lancashire UK


WWW
Small Time vero
« Reply #20 on: May 03, 2012, 08:25:36 AM »

Just did a vero layout for this project:
Logged
Colonel Angus
Posts: 305


Brian M. - Cincinnasty, OH


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #21 on: May 04, 2012, 12:14:15 PM »

Nice work!! That is Back to the Future BTW...  Wink
Logged

Why should you not have 90o angles? Do the electrons bunch up in the corners?
azrael
Posts: 726



Re: Small Time: PT2399 Delay with tails
« Reply #22 on: October 13, 2012, 05:02:59 PM »

Any demos of this design?

I thought it was pretty cool, so I designed a PCB for it, should be here soon. Smiley
Maybe I'll make a video once I learn how to play guitar haha
Logged
John Lyons
Posts: 5712


Basic Audio


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #23 on: October 13, 2012, 05:33:43 PM »

Any demos of this design?
 First page, first link.  Wink
Logged

Basic Audio Pedals
www.basicaudio.net/
azrael
Posts: 726



Re: Small Time: PT2399 Delay with tails
« Reply #24 on: October 17, 2012, 05:33:56 PM »

Yes, I've seen that one. I wanted to see some videos with some people twiddling knobs as the demo goes, John.  Wink
Logged
John Lyons
Posts: 5712


Basic Audio


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #25 on: October 17, 2012, 05:43:07 PM »

Ah, ok, gotcha.  icon_wink
I built one and it's quite nice.
Very tame with no self oscillation as stock
but the sound was nice. No clips though.  Undecided
Logged

Basic Audio Pedals
www.basicaudio.net/
bluebunny
Posts: 1258


Marc B.


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #26 on: November 19, 2012, 12:23:00 PM »

Built this today (see Pictures thread for evidence) and I really like it - thanks Merlin!   Grin

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.
Logged

[M][a][r][c]
Ohm's Law - much like Coles Law, but with less cabbage...
Slade
Posts: 845

Fernando R. from Chile


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #27 on: November 20, 2012, 05:40:24 AM »

Hey, Merlin, thanks for sharing the design.
Is it possible to add just the tails circuit to other PT based delays?
« Last Edit: November 20, 2012, 02:20:00 PM by Slade » Logged

merlinb
Posts: 1027


Merlin, Lancashire UK


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #28 on: November 21, 2012, 10:31:52 AM »

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.
Logged
azrael
Posts: 726



Re: Small Time: PT2399 Delay with tails
« Reply #29 on: November 29, 2012, 03:36:42 PM »

Just built one, couldn't get it to delay until I grounded pin 4. Thoughts on connecting dGND to ground?
Logged
bluebunny
Posts: 1258


Marc B.


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #30 on: November 30, 2012, 09:04:33 AM »

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.
Logged

[M][a][r][c]
Ohm's Law - much like Coles Law, but with less cabbage...
azrael
Posts: 726



Re: Small Time: PT2399 Delay with tails
« Reply #31 on: November 30, 2012, 12:42:50 PM »

Yeap, I'm aware of that, that's why I was a bit confused.
Logged
merlinb
Posts: 1027


Merlin, Lancashire UK


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #32 on: November 30, 2012, 04:39:40 PM »

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.
Logged
phizone
Posts: 21


Re: Small Time: PT2399 Delay with tails
« Reply #33 on: March 30, 2013, 11:31:31 PM »

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.
Logged
deadastronaut
Posts: 8764


Rob H. LONDON


WWW
Re: Small Time: PT2399 Delay with tails
« Reply #34 on: September 25, 2013, 07:20:57 AM »

hi merlin...

with reference to adding a tails to a TB reverb question..

http://www.diystompboxes.com/smfforum/index.php?topic=95632.msg829073#msg829073

as a dumbass who can't visualize it in the real world... Roll Eyes

how would i wire the dpdt?

Logged

Pages: 1 [2] Go Up Print 
« previous next »
Jump to: