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simplest delay ever
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Lorenzo



Joined: Nov 09, 2008
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PostPosted: Sun Jan 25, 2015 6:18 am    Post subject: simplest delay ever
Subject description: simplest delay ever
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Could you suggest me a very simple delay schematics?
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PHOBoS



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PostPosted: Sun Jan 25, 2015 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

a very loooooong wire.

or on a more serious note probably something with a PT2399, but there are several schematics floating around with that chip.
It's a bit noisy though especially at longer delay times. If you want some better quality your best bet is probably just a delay pedal. Rolling Eyes

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glot



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PostPosted: Sun Jan 25, 2015 8:37 am    Post subject: Reply with quote  Mark this post and the followings unread

here is a super simple PT2399 delay circuit. just scroll down its figure 3


http://sound.westhost.com/project26a.htm
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Lorenzo



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PostPosted: Sun Jan 25, 2015 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you very much!
I would like to add a delay to some 555 Atari punk console I made for some friends.
So loss of audio quality or distorted sibilances are not a priblem.
Works PT2399 at 5v?
This is a problem, LM555 vorks at 9v!?

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glot



Joined: Jan 25, 2015
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PostPosted: Sun Jan 25, 2015 2:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

this schematic includes a voltage regulator(78L05) to convert your supply voltage to the 5 volts needed to power the pt2399. so just connect your 9v to the DC+ part of the schematic and ground to the -dc and you're good to go.

have fun making weird noises Smile
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Lorenzo



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PostPosted: Mon Jan 26, 2015 12:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah! Thank you very much for your kindly reply!
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JovianPyx



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PostPosted: Mon Jan 26, 2015 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

I remember reading on the Synth-DIY forum that someone had made a delay out of a piece of garden hose, a speaker and a microphone. The speaker was put into a box with a hole for the hose, I don't remember exactly how the microphone was mounted. Fidelity is as you would expect of the system, but it worked.
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PHOBoS



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PostPosted: Mon Jan 26, 2015 3:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

JovianPyx wrote:
I remember reading on the Synth-DIY forum that someone had made a delay out of a piece of garden hose, a speaker and a microphone.

a quick google search already got me 2 results Shocked :
http://theb-roll.com/garden-hose-stereo-delay/
http://www.uaudio.com/blog/cooper-time-cube-power/

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Lorenzo



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PostPosted: Tue Jan 27, 2015 5:20 am    Post subject: Reply with quote  Mark this post and the followings unread

WoW!!!
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DUBmatze



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PostPosted: Tue Jan 27, 2015 10:29 am    Post subject: Reply with quote  Mark this post and the followings unread

you can drive a piezo disk with your 555 from the apc and mount it into this one:
https://www.google.de/search?q=kids+echo+mic&source=lnms&tbm=isch&sa=X&ei=fsrHVOLoIoa9PYbLgeAB&ved=0CAoQ_AUoAw&biw=1360&bih=922
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hodad



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PostPosted: Wed Jan 28, 2015 7:43 am    Post subject: Reply with quote  Mark this post and the followings unread

re the Cooper Time Cube: the original used one dynamic mic element as a speaker, as well as another to pick up the delayed sound. The "pickup" mic (for lack of a better term) was off to the side of the tube. There was also a little section of tube extending past the pickup that may have had some sort of acoustic damping material in it (it's been a while since I've looked at all this, and I might be misremembering a detail or two.) The hose was plastic, not rubber.

I've always thought it'd be simpler to use a small electret as the pickup mic. There are so many small speakers around these days, in phones, computers, etc. that would probably be better suited as a signal source than a dynamic mic element.
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glot



Joined: Jan 25, 2015
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PostPosted: Wed Jan 28, 2015 8:36 am    Post subject: Reply with quote  Mark this post and the followings unread

wow that cooper time cube is very cool. here is a link to the patent which includes detailed information on how it works including the use of tunable Helmholtz resonators to compensate for the peaks and dips in the frequency spectrum created by running a signal into 30 feet of plastic tubing.



http://www.google.com/patents/US3789328
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Lorenzo



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PostPosted: Wed Jan 28, 2015 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

glot wrote:
here is a super simple PT2399 delay circuit. just scroll down its figure 3

http://sound.westhost.com/project26a.htm


Ok I read the article.
So this module made 1 only time delay.
If I made two of this, I made some experiment whit the timing resistor and I connect these things in some barbarian way, would I have a 2 repetition delay?

I have only to use it with an Atari "wee-woa" Console... Would I try or is it easier to use a delay pedal?

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glot



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PostPosted: Wed Jan 28, 2015 7:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

im not sure what you mean by 2 repetition delay. if you want to increase the number of repeats or echos just turn up the repeat pot. if you want to have two separate delay times then you will need to build two delay circuits and connect them in parallel.

as to whether it would be easier to build this or use a delay pedal im not sure. i must confess i have not built the circuit that i posted so i dont know how easy it is to get working or how well it will work with your apc. it seems simple enough though that you could quickly breadboard it. however i would view it as more of a jumping off point as it would need some modifications to give it variable delay time.

if you have a old delay pedal lying around you don't mind scraping for this project that would probably be faster than breadboarding this circuit and making a layout for it although the first option would certainly be cheaper.

i think DUBmatze's idea is a good one as it is very simple and will give your atari punk console a cool and unique sound although it is a reverb so it might not be what your after.

if you have some stripboard and a pt2399 another option is to use a layout from here http://tagboardeffects.blogspot.com/search/label/Delay
particularly
http://tagboardeffects.blogspot.com/2012/02/i-thought-delay-freaks-may-like-this.html
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Lorenzo



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PostPosted: Thu Jan 29, 2015 1:22 am    Post subject: Reply with quote  Mark this post and the followings unread

DUBmatze wrote:
you can drive a piezo disk with your 555 from the apc and mount it into this one:
https://www.google.de/search?q=kids+echo+mic&source=lnms&tbm=isch&sa=X&ei=fsrHVOLoIoa9PYbLgeAB&ved=0CAoQ_AUoAw&biw=1360&bih=922


Ohh WoW!!
I just see your repley! It would be great!

Glot, I'm sorry for my English... Yes I would like to encrease the number of repetitions. I can't belive that this little module could do that! So... Let turn up the Repeat Pot!

Thank you for all your replies.

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