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DIY Stompboxes => Building your own stompbox => Topic started by: mirza on June 20, 2004, 09:39:13 AM

Title: delay project
Post by: mirza on June 20, 2004, 09:39:13 AM
hi people!
great site!!
I am begginer in DIY (not really, I already finished mxr distortion+ and kay tremolo from GGG) and need advice on what delay should i build...
i'm interested in rebotedelay2 from tonepad or pt80 from GGG.
wich one is better?
thnx
Title: better???
Post by: petemoore on June 20, 2004, 10:11:02 AM
Both.
 
 I haven't tried either, I can't say what the "deferences' are.
Title: delay project
Post by: mirza on June 20, 2004, 11:55:33 AM
what delay did u built?
Title: delay project
Post by: smoguzbenjamin on June 20, 2004, 11:59:16 AM
QuoteI haven't tried either
;)
Title: delay project
Post by: Mark Hammer on June 20, 2004, 12:10:42 PM
The PT-80 includes companding, which will help to reduce much of the various noise sources that are always a part of delay pedals, whether analog or delay.  The Rebote is a less complicated design, which omits companding.  The compander chip increases the size, price, and complexity, but it's your decision how much noise you want to live with.
Title: delay project
Post by: mirza on June 20, 2004, 02:48:32 PM
hm....sometimes nosie is a good thing...sometimes not.
i feel not noisy....
any other delays to build beside thees two?
Title: delay project
Post by: smoguzbenjamin on June 20, 2004, 02:55:35 PM
Plenty! I just can't seem to think of any right now. But without companding your signal's gonna be noisy all the same. I say invest the time and effort into noiselesness and do the PT-80 ;)
Title: delay project
Post by: mirza on June 20, 2004, 03:07:24 PM
ok. thnx for advice but I'm only interested in how much noise are we talking about?
PT-80 then!!
Title: delay project
Post by: smoguzbenjamin on June 20, 2004, 03:09:54 PM
Well it might be a little hissy, and clock bleedthrough can sometimes be an issue. I have a Boss DD-2 digital delay that I'm very happy with, so I haven't build a delay pedal as of yet. So I can't really tell you, but I think that the difference will be noticable.
Title: delay project
Post by: mirza on June 20, 2004, 06:08:54 PM
o have dd-5 and tried lots of tried other but now i need another one for my synth...well. thnx.
PT80 then it is
Title: delay project
Post by: mirza on June 20, 2004, 08:18:45 PM
ok PT80
so i want to order from smallbear and i see that i need this:"1uF    (film) These are Cornell Dubilier DME series,
             Mouser part number 5989-100V1.0
     or Panasonic ECQ-E(F) series,
              Digikey part number EF1105-ND"
but in smallbear is only Panasonic ECQ-B Series
is it ok to use theese from smallbear or I must use ones from part list?

and also they don't have 1N4002 diondes...only 1N4001...is that also ok? or 1N4002?
Title: delay project
Post by: SoundTech on June 20, 2004, 10:10:42 PM
It's OK to order from Steve's stock.  The main difference is that the specified ones are smaller, so it's easier to fit them into a layout.
Title: delay project
Post by: Fp-www.Tonepad.com on June 20, 2004, 10:23:21 PM
I could swear that the PT2399 has a noise gate built in. NO companding is needed... The companding was added by Scott Swartz to follow with the AD-80 (or something like that, which uses BBDs which ARE noisy), but as far as I know there's very little benefit when using a PT2399.

I say, build both!

The noise level in the Rebote2 is... well, no noise I can hear.

Fp

ps: I would appreciate that comments like rebote2 being noisier than PT-80 would be done by someone who has built them both, and not based on intuition watching the circuit blocks that each circuit is made of.
Title: delay project
Post by: puretube on June 21, 2004, 01:33:45 AM
I wouldn`t swear on that...
Title: delay project
Post by: Travis on June 21, 2004, 01:55:51 AM
My Rebote-2 is quiet.  I've underclocked the chip by quite a bit, but have not run into clock noise problems.

I have a PT-80 on the blocks, should be done in a few days.  

I think you'll probably be happy with either of them.  That people who have built one of them don't bother building the other says something nice about both circuits.
Title: delay project
Post by: smoguzbenjamin on June 21, 2004, 02:12:06 AM
Fp, I said that it *might* be noisier ;) Just looking at the schem I got the impression that it might be noisier but if it isn't that's a good thing!
Title: delay project
Post by: Peter Snowberg on June 21, 2004, 02:47:52 AM
In addition to noise reduction, the companding also "evens" things out in terms of resolution.

Ears are logrithmic in their response, but the A/D and D/A in the PT2399 are not. The compander allows the dynamic range of the delay to be used to the best extent. Without a compander, the bulk of the resolution is wasted on the area where the signal seldom is sitting.

Best of luck on your builds!

Take care,
-Peter
Title: delay project
Post by: mirza on June 21, 2004, 07:03:43 AM
ECQ-B Series instead ECQ-E(F) Series
1N4001 diodes instead 1N4002

could someone confirm this will work...?
what are diferences between these components...?
Title: delay project
Post by: mirza on June 22, 2004, 06:45:06 AM
c'mon guys..... :(
ECQ-B Series instead ECQ-E(F) Series
1N4001 diodes instead 1N4002
is this ok?
please
Title: delay project
Post by: Peter Snowberg on June 22, 2004, 07:16:31 AM
If your circuit uses less than 50 volts then 1N4001 is the same as 1N4002 and all the others up to 1N4007. The maximum voltage the 1N4001 can handle in reverse (also called PIV or peak inverse voltage) is 50 volts while the 1N4002 can handle 100 volts. The 1N4007 can handle 1000V. :D

Take care,
-Peter
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