Any non PT2399 Delay?

[NBguitarist]

I just finished my deep blue delay that is using PT2399.
It work well but it is quite noisy (Problem of the chip)
Just wonder if there any simple, non PT2399 Delay circuit?

[Mark Hammer]

1) Shortening the delay time will usually improve noise, whether using analog BBD or PT2399.

2) You can lower the cutoff frequency of the lowpass filter.  Specifically, the caps between pins 9-10 and 11-12 are shown as 100nf.  Consider adding a little more capacitance to them and see if that cures it.

[NBguitarist]

1) Shortening the delay time will usually improve noise, whether using analog BBD or PT2399.

2) You can lower the cutoff frequency of the lowpass filter.  Specifically, the caps between pins 9-10 and 11-12 are shown as 100nf.  Consider adding a little more capacitance to them and see if that cures it.

1) I don't think "improve" the noise with short delay time is good solution as sometime long delay is needed. And the noise is still there.
2) I personally love cleaner delay. Deep blue delay already sound a bit muddy for me. Cutting more treble with make it doesn't sound like a delay at all.

Like using a noise gate. This is not actually resolving the noise problem. That why I am looking for another delay with another chip.

Thanks

[Mark Hammer]

Most projects will use a PT2399 because it is so easy to use, so available, and so cheap.  In 1980, it would have cost a few hundred dollars (and that's 1980 dollars!), and taken a box full of parts to do what the 2399 now does for often less than a dollar.

But the 2399 does not have infinite RAM storage so its delay time is limited.  It IS a very useful range of times, but still limited.  If it is integrated into a bigger circuit than the Deep Blue, and other "minimalist" delay projects, it might be quieter.  For example, the PT-80 project, over at General Guitar Gadgets ( http://www.generalguitargadgets.com/projects/20-modulationecho/125-pt-80-delay ) goes a step beyond the Deep Blue, and includes companding, which may do what you need.  I built one, and it works fine.  I'm in no position to judge its noise level, however, since I test things out with a very small amp at low levels, with limited treble response.  But companding is generally used to keep noise to a blessed minimum.

[NBguitarist]

Most projects will use a PT2399 because it is so easy to use, so available, and so cheap.  In 1980, it would have cost a few hundred dollars (and that's 1980 dollars!), and taken a box full of parts to do what the 2399 now does for often less than a dollar.

But the 2399 does not have infinite RAM storage so its delay time is limited.  It IS a very useful range of times, but still limited.  If it is integrated into a bigger circuit than the Deep Blue, and other "minimalist" delay projects, it might be quieter.  For example, the PT-80 project, over at General Guitar Gadgets ( http://www.generalguitargadgets.com/projects/20-modulationecho/125-pt-80-delay ) goes a step beyond the Deep Blue, and includes companding, which may do what you need.  I built one, and it works fine.  I'm in no position to judge its noise level, however, since I test things out with a very small amp at low levels, with limited treble response.  But companding is generally used to keep noise to a blessed minimum.

So which "BIGGER" pt2399 delay do you think that is having less noise, brighter sound?
PT-80. Echo Base, Rebote ?

[midwayfair]

Bright sounding delay, 650mS max, low distortion, and the delay chip itself can't be overdriven, with no need for a compander. Here ya go:

https://docs.google.com/document/d/1P7uOYFRH6ZW5eGoquhAiMQMyUU76bod_gNKkiSlPNJM/edit

The only way you're getting more than 600 mS without noise or significant bandwidth reduction is to go FV-1 or find some way to run 3-4 MN3005s, and that introduces major, major current consumption and runs into all sorts of other issues.

[Mark Hammer]

I've made all three (PT80, Echobase, Rebote), and they all sound nice.  The PT-80 is the only one I am aware of that uses companding.  I haven't tried Jon's, so I'm not going to make any pronouncements about noise based on a Youtube demo listened to on my work system.

[tubeguy]

Give a look to this project, has better sound and less noise than the other, plus 800 ms of delay and tone control.

http://electric-sound.tripod.com/sitebuildercontent/sitebuilderfiles/double_d.pdf

[Ice-9]

You could always have a look at the FV-1, the thread  has a full project and it has a 1 second delay, also can be used for many other effects like octavers reverbs etc.

http://www.diystompboxes.com/smfforum/index.php?topic=104291.0

[candidate]

still looking for something with a bl3208 in it

[roseblood11]

I built a lot of PT2399-based delays, had one based on FV-1 and some analog delays, like Deluxe Memory Man, Memory Boy etc - and I ended up buying a used Line6 Echo Park for $40. This thing sounds so much better than all the diy circuits and it can produce a lot more very useful sounds.

[midwayfair]

still looking for something with a bl3208 in it

Madbean's Aquaboy can use those.

[Jdansti]

Any love for the MN3007/MN3101 combo?

http://pdf.datasheetcatalog.com/datasheet/panasonic/MN3007.pdf

[deadastronaut]

Im currently working on a 3 or 4 pt2399 in series delay, its coming along nicely....longer delay, cleaner delay....

i have 3 in series on breadboard at the mo with great results, about to add a 4th....just to try whilst breadboarding...

much much better than 1 or 2 pt,s....2pt,s are pretty good, but i,m just greedy, and the chips are cheap as....erm chips

[Buzz]

Any love for the MN3007/MN3101 combo?

http://pdf.datasheetcatalog.com/datasheet/panasonic/MN3007.pdf

Seems to have a pretty short delay time. 51.2ms it says on the sheet. Could this be extended via circuitry or multiple chips ?

Maybe better for vibrato or reverb?

[Dave W]

http://www.diystompboxes.com/smfforum/index.php?topic=18388.0

[bean]

I've been working on a new delay project that's based on the HT8955a. It has about 800ms of delay, bit better headroom and less noise than the PT2399. However, it's not at all what I would call "simple". Once you add in a compander and modulation it's got about as many parts as an analog delay. But, it is an improvement on the PT2399 based delays, IMO. Anyway, check out the "Shecho" on GGG for an idea of what a HT8955a type delay entails.

[peterv999]

I built a lot of PT2399-based delays, had one based on FV-1 and some analog delays, like Deluxe Memory Man, Memory Boy etc - and I ended up buying a used Line6 Echo Park for $40. This thing sounds so much better than all the diy circuits and it can produce a lot more very useful sounds.

Your comparison FV-1 and EchoPark is not correct as you did not mention what was loaded on the FV-1 to be able to play it with echoes to allow for comparison. Yes, I have worked with the FV-1 extensively and own a Echo Park myself.

[allesz]

This is a dream tread for me (a wet dream actualy  ).

Still I must say +1 to roseblood: although I want to be buried with my (reissue) AD9, the best gig and rehearsals delay I got is the analog sim on my zoom multistomp.

But, since I need delay times of 330 ms, or a little less; and getting back on my wet dream, I admit I am studing the EH full double tracking effect schemo: a nice guy on fsb named phibes made a version with a v3205 in place of the original chip; but still I find it quite complicated....

I wonder if it's possible to make an analog delay with a single v3205 (delay times around 300 ms), one transistor input buffer and one transistor output buffer, and a two trannies variable astable multivibrator to drive the delay chip; I think the buffers cab be made with a double op amp and the multivib vith a 555 (but I bet it would be too noisy with this IC). Probaly not a good gig delay but....

Ok, now you know I am a total fool, and that I don't know nothing about electronic (well, this was quite evident  ).

[armdnrdy]

In theory you can make a delay with a long piece of string and a couple of tin cans but.....it's not going to sound very good!

Your simplistic approach has left out quite a few "needed" essentials to make an analog delay usable.

Namely filtering.