my new delay, over the top PT2399's

Stompboxes circuits published in magazines, books or on DIY electronics websites.
User avatar
cpm
Resistor Ronker
Information
Posts: 277
Joined: 29 Oct 2008, 09:55
Location: spain
Been thanked: 51 times

Post by cpm »

This is my attempt into a delay, a not so simple one.
My aim is to squeeze the maximum delay times and clean repeats from the PT chips, and add some fancies that match my taste for delay, which is some modulation and other tricks in order to achieve a very atmospheic and lush sound.
It provides up to ~400ms of quite clean delay time, and 1sec of sensible max time (with some grit), and plenty of clean repeats

The main signal path is the usual: pre-emphasis, compressor, delay stages, low-pass filters, expanding,output emphasis/voicing.
Bypass is made with cmos gates (4053), to keep the tails of the delay in the background even when the effect is switched off.
Additionally, there is a side chain to rectify and get the envelope to light an LED/LDR which modulates the delay time for a touch-sensitive chorus effect.
The part with the 4027 latch is for switching the control signals, using momentary switches.
Feedback is taken from the end of the line, after the expander stage, as usual. But theres a second feedback (switchable) that makes a full regeneration (sort of "infinite wall of sound") but not getting the volume out of hand. Its volume its controlled from a separate pot.

I've put a lot of effort in this piece, and some ideas that (i think) would separate this from the plenty-PT-delays that already exists.
you know the stuff: use for learning, improving, ideas, etc, credit where due
i hope you appreciate!
Attachments
cpmddl09.png

sinner
Old Solderhand
Information
Posts: 4809
Joined: 06 Nov 2008, 17:16
Location: ...no more
Has thanked: 1111 times
Been thanked: 954 times

Post by sinner »

Thank you for sharing cpm :hug: Description sound awesome :applause:

User avatar
bajaman
Old Solderhand
Information
Posts: 4415
Joined: 26 Jun 2007, 21:18
Location: New Brighton, Christchurch, NZ
Has thanked: 473 times
Been thanked: 1720 times

Post by bajaman »

:thumbsup
bajaman
be kind to all animals - especially human beings

User avatar
cpm
Resistor Ronker
Information
Posts: 277
Joined: 29 Oct 2008, 09:55
Location: spain
Been thanked: 51 times

Post by cpm »

here is some samples i recorded some time ago from an early version

http://www.soundclick.com/bands/page_so ... ID=8355105

User avatar
rocklander
Old Solderhand
Information
Posts: 2890
Joined: 18 Apr 2008, 11:33
my favorite amplifier: my jansen bassman 50
Completed builds: rebote 2.5; supreaux; odie; heartthrob tremolo; ross phaser; dr. boogey; thor; baja black toast; slow gear attack, rebote, tri-vibe, small clone, little angel, magnus modulus, echo base, hex fuzz, big muff, 22/7.
Location: Rotorua, New Zealand
Has thanked: 1386 times
Been thanked: 225 times
Contact:

Post by rocklander »

mind boggling to this n00b.. nicely done :D
world's greatest tautologist ...in the world
Ronsonic wrote:...the lower the stakes the more vicious the combat.

roseblood11
Tube Twister
Information
Posts: 1872
Joined: 23 Aug 2008, 14:21
Has thanked: 346 times
Been thanked: 297 times

Post by roseblood11 »

This sounds really interesting! :applause: :applause: :applause:

-What is the shortest possible delay time?
-Can the modulation sound more like the chorus/vibrato in a EHX Deluxe Memory Man?
If so, I´d suggest to call it the "Memory Stepson" or s.th. like that :wink:

Will you post a complete project file for this one? I think this is a circuit that many people have waited for a long time - a diy delay with really good sound, low noise and modulation. None of the other projects has all of that. I built the Echobase, the Magnus Modulus and the PT-80 - and ended up with a commercial digital multi fx and an analogue delay...

RnFR
Old Solderhand
Information
Posts: 5139
Joined: 09 Jan 2008, 06:02
my favorite amplifier: Traynor YBA-III, Fender Super Six
Completed builds: custom fuzz.
Location: Inner Earth
Has thanked: 141 times
Been thanked: 138 times
Contact:

Post by RnFR »

sounds gorgeous!
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO

User avatar
cpm
Resistor Ronker
Information
Posts: 277
Joined: 29 Oct 2008, 09:55
Location: spain
Been thanked: 51 times

Post by cpm »

the tradeoff for the filtering seems to be some phase alterations, i guess that causes the reverby sound, which is cool though
What is the shortest possible delay time
the usual for the PT, i ddont know exactly, but very short.
Can the modulation sound more like the chorus/vibrato in a EHX Deluxe Memory Man?
on the right setting, you can push the modulation with the peaks from the playing attack, but it wont sound as steady as an LFO.
there is an ldr, and a transistor to drive it, so an LFO would be an easy addon

for the pcb, its not verified yet, i wouldnt like either to support a 40-page thread for begginers, no offense intended, simply this is not an easy build

davidmochen
Information
Posts: 14
Joined: 03 Oct 2011, 06:16
Has thanked: 11 times

Post by davidmochen »

Hi, cpm,

The samples sound amazing. I was wondering if you experienced the distortion issues some people are reporting with the Echobase.

Do you have a PCB that you are willing to share?

Thanks very much,

David

roseblood11
Tube Twister
Information
Posts: 1872
Joined: 23 Aug 2008, 14:21
Has thanked: 346 times
Been thanked: 297 times

Post by roseblood11 »

I've never bought an etched pcb before, but if someone would offer a good one for this project, I'd order it at once!

Taylor? Madbean?

User avatar
willc1968
Breadboard Brother
Information
Posts: 50
Joined: 05 May 2009, 17:13
my favorite amplifier: Kustom K 200 A-4 in red
Completed builds: kay fuzz, clark fuzz, ea tremelo, green ringer, tremelus lune, a few big muffs, fuzz face and factory, sft, woolly mamoth, a bunch of tonebenders and many more that need to be boxed
Location: philly
Has thanked: 13 times

Post by willc1968 »

The clip sounded really good. A whole lot of potential with with very ambitious circuit from what I can see.
I do dig the PT 2399 chip, there are so many cool things that you can do with this inexpensive IC.
Good luck on getting a finalized version of this.

pablocarrillo
Information
Posts: 5
Joined: 13 Oct 2007, 01:33
Has thanked: 7 times
Been thanked: 1 time

Post by pablocarrillo »


User avatar
cpm
Resistor Ronker
Information
Posts: 277
Joined: 29 Oct 2008, 09:55
Location: spain
Been thanked: 51 times

Post by cpm »

Once that it has been made a first version, i find now a lot of things to redesign and improve.
I'm planning on doing two derivatives, the fancier one with modulation, and another with only the delay, to keep it simple for 3 knobs, keeping the voicing this one has..

User avatar
pedalgrinder
Cap Cooler
Information
Posts: 553
Joined: 29 Aug 2011, 06:05
my favorite amplifier: Ampeg SVT
Completed builds: pedals with pots switches and everything
Location: South Australia Adelaide
Has thanked: 199 times
Been thanked: 153 times

Post by pedalgrinder »

Have you tried it with a bass??? i tried a the echo base i think it was called with the pt2399 but it really didn't like the bass on the low notes. It only seemed to respond nicely for a guitar. So my mate got it he likes it though. So i was curious if you had tried a bass on it????
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

User avatar
~arph
Cap Cooler
Information
Posts: 606
Joined: 20 Sep 2007, 10:35
Has thanked: 61 times
Been thanked: 159 times

Post by ~arph »

Just saw this for the first time, great circuit! sounds nice :applause:
In the quiet words of the virgin Mary: "Come again?"

davidmochen
Information
Posts: 14
Joined: 03 Oct 2011, 06:16
Has thanked: 11 times

Post by davidmochen »

cpm wrote:Once that it has been made a first version, i find now a lot of things to redesign and improve.
I'm planning on doing two derivatives, the fancier one with modulation, and another with only the delay, to keep it simple for 3 knobs, keeping the voicing this one has..
Waiting eagerly for it!

Thanks again :)

David (bass player from Argentina)

User avatar
rasta_maleek
Resistor Ronker
Information
Posts: 258
Joined: 11 Jul 2009, 12:56
Has thanked: 60 times
Been thanked: 50 times

Post by rasta_maleek »

I have the atmosphere delay too. I'm doing a video with the memory man DIY and the atmosphere, it will be ready in a bit.

roseblood11
Tube Twister
Information
Posts: 1872
Joined: 23 Aug 2008, 14:21
Has thanked: 346 times
Been thanked: 297 times

Post by roseblood11 »

Could be really interesting to make a third version with the modulation off the Deluxe Memory Man.

User avatar
pedalgrinder
Cap Cooler
Information
Posts: 553
Joined: 29 Aug 2011, 06:05
my favorite amplifier: Ampeg SVT
Completed builds: pedals with pots switches and everything
Location: South Australia Adelaide
Has thanked: 199 times
Been thanked: 153 times

Post by pedalgrinder »

does anyone know about if it will work on bass frequency's rather than just guitar. There are bass players out there
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

madbean
Information

Post by madbean »

Damn, I really wanna build this one! Looks amazing cpm.

Post Reply