Mad Professor - Deep Blue Delay  [traced]

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Re: Mad Professor - Deep Blue Delay  [traced]

Postby andregarcia57 » 16 Apr 2014, 17:55

this schematic is correct?

Image
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Re: Mad Professor - Deep Blue Delay

Postby andregarcia57 » 17 Apr 2014, 19:23

hello ... because I need to disconnect power and connect to the pedal work.
  may be PT2399?
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Re: Mad Professor - Deep Blue Delay

Postby Ice-9 » 17 Apr 2014, 21:34

andregarcia57 wrote:hello ... because I need to disconnect power and connect to the pedal work.
  may be PT2399?


Sorry but something was lost in translation there, perhaps you could rephrase the question. :hmmm:
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

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Re: Mad Professor - Deep Blue Delay

Postby rocklander » 17 Apr 2014, 21:58

possibly he's experiencing the similar issue as many have on the little angel where the pt2399 locks up and a power cycle is needed?
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Re: Mad Professor - Deep Blue Delay

Postby Ice-9 » 18 Apr 2014, 00:33

rocklander wrote:possibly he's experiencing the similar issue as many have on the little angel where the pt2399 locks up and a power cycle is needed?


Ahh, cheers rocklander, that makes sense to me now. :)
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

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Re: Mad Professor - Deep Blue Delay

Postby rocklander » 18 Apr 2014, 00:50

purely a guess though :whappen:
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Re: Mad Professor - Deep Blue Delay

Postby andregarcia57 » 18 Apr 2014, 03:21

rocklander wrote:possibly he's experiencing the similar issue as many have on the little angel where the pt2399 locks up and a power cycle is needed?


that. same problem of little angel.
I do the same with PT2399 delay robote and there is no problem ....
this is very strange ..
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Re: Mad Professor - Deep Blue Delay

Postby rocklander » 18 Apr 2014, 03:27

have you tried a different pt2399?
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Re: Mad Professor - Deep Blue Delay

Postby Chugs » 18 Apr 2014, 09:38

Or ground pin 4 of the PT2399 to analog ground. This can stop the PT2399 from locking up.

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Re: Mad Professor - Deep Blue Delay

Postby Nick123 » 18 Apr 2014, 11:22

Chugs wrote:Or ground pin 4 of the PT2399 to analog ground. This can stop the PT2399 from locking up.


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Re: Mad Professor - Deep Blue Delay

Postby andregarcia57 » 18 Apr 2014, 12:16

actually this is the problem.

I have the schematic was not ground pin 4. ok now.
100k and also pop out.
thanks.
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Re: Mad Professor - Deep Blue Delay

Postby greenskull » 26 May 2014, 07:28

imnotgay wrote:it should work..i use 10k pot and 0.22uF..provide a clean repeats at 1 second delay time


I just built this up from Madbean's "Sea Urchin" pcb layout.
Where did you splice in your tone control? I tried it off lug 3 of the mix pot and works, but affects the "Feedback" by reducing it's intensity.
Maybe another way is to locate the tone control in place of the 15nf cap located at delay chip's output?
Thanks for any advice.
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Re: Mad Professor - Deep Blue Delay

Postby modmod » 25 Jul 2014, 16:47

Where can I find Madbeans Sea Urchin PCB?
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Changing pot range

Postby seyda » 19 Nov 2014, 21:18

Hi folks,
hope it's not against the DIY ethos, but with all the experts here ... :wink:
I have an original one, totally enjoy the sound, but don't get along too well with the range of the level pot.
I'd rather have what is now 11 o'clock as max level, so I could dial in subtle amounts better. :scratch:
Any suggestions ?
thanks,
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Re: Mad Professor - Deep Blue Delay

Postby Nick123 » 24 Nov 2014, 16:39

Changing level pot with the same one but with a log tapper instead of the linear one could help.

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Re: Mad Professor - Deep Blue Delay

Postby john-houston » 30 Nov 2014, 10:20

Hello everyone!
I'm new and this is my first post but I follow you for years. ;)
I followed the schematic posted by nocentelli but I have a problem. :'(
When I connect the effect, I can hear the sound coming from my guitar but there's no effect... only the dry signal.
I made the following measurements:
TL072:
3,71---7,44
3,71---3,70
3,71---3,70
0-------3,70
PT2399 (pot fully clockwise):
6,33---3,16
3,15---3,16
0-------3,16
0,27---3,16
3,63---3,16
3,67---3,16
1,42---3,16
1,52---3,16
I've checked every line of my stripboard and I 'm not able to find the mistake.
What could be in your opinion?

p.s. the only difference with the original circuit posted by nocentelli is the resistor between the pins 6-7 of IC2 (original value 390k / mine 360k)
p.p.s. sorry for my bad "google-translated" english.... I'm from Italy! ;)
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Re: Mad Professor - Deep Blue Delay

Postby Nocentelli » 30 Nov 2014, 10:56

The readings that look wrong straight away are pin 8 of the opamp, which should be close to 9v (is your battery fresh?) and pin 1 of the pt2399 which should be 5v (check the voltage regulator pinout is correct).
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Re: Mad Professor - Deep Blue Delay

Postby john-houston » 30 Nov 2014, 11:14

Nocentelli wrote:The readings that look wrong straight away are pin 8 of the opamp, which should be close to 9v (is your battery fresh?) and pin 1 of the pt2399 which should be 5v (check the voltage regulator pinout is correct).

Thank you for the quick answer!
I use a stabilized power supply (9V). I just realized that the regulator that I've bought (L7805CV... that one with the heat sink, to clarify) has a different pinout. I've tried to reverse it but the problem remains the same... no wet signal. :'(
Tomorrow I'm going to buy the right regulator... maybe the solution to my problems it's easy than I expected. :D
As soon as I'll mount the right piece, I'll take new measurements and let you know.
All I can do is HOPE. :D
Thank you again!
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Re: Mad Professor - Deep Blue Delay

Postby jorgelopes » 30 Nov 2014, 12:06

make sure that the pin 4 of the pt2399 is connected to the ground.

Usually this issue is related to not having the pin 4 properly grounded which makes the pt2399 lock.
Verify/correct it and report on the results.

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Re: Mad Professor - Deep Blue Delay

Postby Nocentelli » 30 Nov 2014, 12:46

john-houston wrote:I use a stabilized power supply


Then you need to think why opamp pin 8 is not 9v. Is the 33r resistor you have installed definitely 33 ohms, or could it be 3k3?
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