A simple PT2399 diy flanger pedal?

Stompboxes circuits published in magazines, books or on DIY electronics websites.

A simple PT2399 diy flanger pedal?

Postby ballfire » 26 Apr 2011, 07:20

good day..

using MN3007 delay chip and cd4046 john hollis created zombie chorus and ultra flanger..

Is there a possibility you can create a simple flanger diy pedal out of pt2399 echo chip?..coz i have seen a chorus based on pt2399 by rick holt??

any opinions?

thank you.
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Re: A simple PT2399 diy flanger pedal?

Postby frequencycentral » 26 Apr 2011, 08:31

A single PT2399 has too long a delay time for flanging. But I'm currently exploring the possibilities of running two PT2399 in parallel...........the latency will always be a problem, but if you mix in some dry.............
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Re: A simple PT2399 diy flanger pedal?

Postby ballfire » 26 Apr 2011, 09:58

its really possible??
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Re: A simple PT2399 diy flanger pedal?

Postby culturejam » 26 Apr 2011, 14:06

ballfire wrote:Is there a possibility you can create a simple flanger diy pedal out of pt2399 echo chip?..coz i have seen a chorus based on pt2399 by rick holt?

Here's some info on Rick's ideas on a possible 2399 flanger:
http://circuitworkshop.com/forum/index.php?topic=850.0
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Re: A simple PT2399 diy flanger pedal?

Postby DeanM » 26 Apr 2011, 21:55

I just looked at the PT2396. that can do delay times of 12.3ms. Would that be good enough for flanger?

Has anyone considered using that chip? theres more external parts required including a 2MHz crystal but that would still probably be cheaper than using two 2399s? also the delay times can be set by a microcontroller using a serial data input. probably a lil more complicated than necessary but there is an "easy mode" that uses four digital inputs (DL1 - DL4) to set the delay times in steps. this could be done with say internal dip switches for presetting the delay time. or if you wanted it adjustable a microcontroller could still be used even in easy mode. for example, if you wanted to avoid serial programming and the timings involved you could use a small little pic microcontroller with an adc. hook up a pot to ground and 5V and use the wiper as an input. by reading the ADC level you could set 4 digital outputs to control the delay times. or even ditch the ADC and use digital switch to toggle through the delay times.

Does this sound interesting to anybody? Is there a reason this hasn't been looked at instead of using two pt2399s? I mean, other than some of the reasons i mentioned above, is there any limitations that i've missed or overlooked? I haven't looked at flanger pedals so don't know too much about the circuit requirements etc.
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Re: A simple PT2399 diy flanger pedal?

Postby mictester » 26 Apr 2011, 22:13

DeanM wrote:I just looked at the PT2396. that can do delay times of 12.3ms. Would that be good enough for flanger?

Has anyone considered using that chip? theres more external parts required including a 2MHz crystal but that would still probably be cheaper than using two 2399s? also the delay times can be set by a microcontroller using a serial data input. probably a lil more complicated than necessary but there is an "easy mode" that uses four digital inputs (DL1 - DL4) to set the delay times in steps. this could be done with say internal dip switches for presetting the delay time. or if you wanted it adjustable a microcontroller could still be used even in easy mode. for example, if you wanted to avoid serial programming and the timings involved you could use a small little pic microcontroller with an adc. hook up a pot to ground and 5V and use the wiper as an input. by reading the ADC level you could set 4 digital outputs to control the delay times. or even ditch the ADC and use digital switch to toggle through the delay times.

Does this sound interesting to anybody? Is there a reason this hasn't been looked at instead of using two pt2399s? I mean, other than some of the reasons i mentioned above, is there any limitations that i've missed or overlooked? I haven't looked at flanger pedals so don't know too much about the circuit requirements etc.


You've overlooked the fact that the delay is stepped - a musically useful flanger has the delay swept between two values.
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Re: A simple PT2399 diy flanger pedal?

Postby culturejam » 26 Apr 2011, 22:29

Equally important: the PT2396 if farkin HUGE. :lol:
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Re: A simple PT2399 diy flanger pedal?

Postby DeanM » 26 Apr 2011, 22:36

mictester wrote:You've overlooked the fact that the delay is stepped - a musically useful flanger has the delay swept between two values.


Actually, I did notice that and suspected that would be an issue but as i mentioned, i haven't looked at flanger circuits so wasn't sure! Actually...I don't think i've ever looked at a flanger circuit! lol

I see what you mean, thanks for clarifying!
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Re: A simple PT2399 diy flanger pedal?

Postby Hides-His-Eyes » 26 Apr 2011, 22:37

you could try v_ref modulation like the little angel
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Re: A simple PT2399 diy flanger pedal?

Postby DeanM » 26 Apr 2011, 22:54

culturejam wrote:Equally important: the PT2396 if farkin HUGE. :lol:

I dont think size would be that much of an issue. not equally as much as the delay times being swept anyway, IMO.

In DIP packages 2399 is 300mm and 2396 is 600mm so yeah its twice the size but if using two 2399s then size wouldn't make much difference i dont think. also with the 2399 its in one package so routing would be less of a pain i would imagine. and probably use less parts than two 2399s which would take less space and routing etc.

Also in SO package the 2396 comes down to 300mm, same as the 2399! and SO packages, although surface mount are actually easy enough to work with. I worked with an SO16 chip for an RFID project and soldering it was much easier than i expected! :scratch:
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Re: A simple PT2399 diy flanger pedal?

Postby DeanM » 26 Apr 2011, 23:09

Hides-His-Eyes wrote:you could try v_ref modulation like the little angel


I just searched for the little angel after i read your post. Might be an interesting read when i have the time.
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Re: A simple PT2399 diy flanger pedal?

Postby culturejam » 26 Apr 2011, 23:11

DeanM wrote:Also in SO package the 2396 comes down to 300mm, same as the 2399!

Oh sure, go for the SMD. That's cheating. :mrgreen:

The through-hole version is big enough to surf on!
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Re: A simple PT2399 diy flanger pedal?

Postby Hides-His-Eyes » 26 Apr 2011, 23:27

pit it on SIL sockets and put the resistors underneath.
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Re: A simple PT2399 diy flanger pedal?

Postby ckyvick » 26 Apr 2011, 23:30

Someone posted a video of a pt2399 flanger they were working on but it has been removed, here is the thread-
http://www.freestompboxes.org/viewtopic.php?f=52&t=3745
Not sure what happened to the project thou.
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Re: A simple PT2399 diy flanger pedal?

Postby culturejam » 26 Apr 2011, 23:37

^^^^ That was Nathan. I'll ask him what happened.
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Re: A simple PT2399 diy flanger pedal?

Postby DeanM » 26 Apr 2011, 23:48

dammit that edit button needs a longer time! lol

In my previous post i mentioned the 2399 and 2396 dimensions in mm. That was obviously a typo! lol its 300mil and 600mil. Not 300mm and 600mm! i'm not sure they would fit in a hammond box? :mrgreen: lol and it also refers to pin row spacings. not package lengths.
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Re: A simple PT2399 diy flanger pedal?

Postby Hides-His-Eyes » 27 Apr 2011, 00:01

my brain "autocorrected" for you. The Belton Brick is probably as close to that number as you could get ;)
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Re: A simple PT2399 diy flanger pedal?

Postby DeanM » 27 Apr 2011, 00:05

Hides-His-Eyes wrote:my brain "autocorrected" for you. The Belton Brick is probably as close to that number as you could get ;)

lol I think mine autocorrected too!

Hmmm, what about an actual reverb tank? lol :mrgreen:
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Re: A simple PT2399 diy flanger pedal?

Postby Hides-His-Eyes » 27 Apr 2011, 00:20

I'd love to see an eagle library for one of those!

I wonder if you could make a flanger by modulating the length of a spring. :idea: :scratch:
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Re: A simple PT2399 diy flanger pedal?

Postby ballfire » 27 Apr 2011, 06:14

good day..


its really existing..

interesting..
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