Rediculously modded PT2399 Delay

Forced_Fire · Post by **Forced_Fire** » 10 Feb 2009, 22:54

Looks cool. I can't wait to see this board.

NOC3 · Post by **NOC3** » 11 Feb 2009, 06:20

OK everyone,

Boards will be here in about 15 days. I'll post pics when they get here. They are double sided with ground planes (power ground and signal ground are isolated), plated through holes, solder mask on both sides, and silkscreened.

You are welcome to as many PCBs as you would like. They will be $22 each, including: 1 MAX1044, 2 PT2399's, and 1 SA571. Shipping won't be any extra unless you are outside the USA. The price was determined based on the size of the board and the cost of other delay PCB's available elsewhere.

The IC's will take a little longer to get here because I'm getting them in bulk from futurlec. So it could be a couple weeks after the boards arrive. But that will give me time to build one and work out any component tweaks.

Please post here to say if you would like one (or more). Just so I have an idea of how many to get.

jimosity · Post by **jimosity** » 11 Feb 2009, 11:10

PM me when the boards are available and I may take one.

Dallas · Post by **Dallas** » 11 Feb 2009, 22:13

Hello - my first post on this wonderful site

I will take a pcb for sure - can't wait to give it a try. Have built a few kit effects and have decided to make the jump to putting the matterials together myself... so much to learn.

You should put out a vid or at least a sound file from the unit here so we can here some of the pedal, how long those delay times get, etc.

Thanks,
Dallas

tuemmueh · Post by **tuemmueh** » 13 Feb 2009, 10:19

I'm also in for one!

ekajjake123 · Post by **ekajjake123** » 16 Feb 2009, 06:23

I'm definitely interested in 2!

Barcode · Post by **Barcode** » 16 Feb 2009, 20:48

NOC3 wrote:Thanks for the replys guys.

Concerning the modulation LFO, I lifted it from the magnus modulus after hearing the clips.

The LFO is a modified triangle wave, not a square wave. If you wanted it square just reconnect pin 5 of U2 to pin 3 of U2 on the other side of that 470k resistor. Tremulus lune LFO. C32 and C46 may need to be 100uf to alter the range depending on how slow or fast you'll want it...you could also use bigger rate pots

As far as the voltage goes, check the datasheet for the SA571. Maximum voltage 18v. I don't like running things close to their absolute maximum ratings. It might be ok, it might not, but one surge and you are done for sure though. 12v is still a big improvement over 9v, it would take a pretty big signal to cause any clipping. If you REALY wanted 18 volts though, just jumper pins 1 and 3 on the 12v regulator.

A couple more things I'll add will be:
1- Pads for a "Dry kill" switch, that will cut the dry signal coming out of the mono output.
2- A sister board for an option to add a second PT2399, with pads for connecting it to the main board, running them in series will give much cleaner long delays. Just use a fixed resistor for the second PT2399, half the "course" delay time pot value to 50k, and replace the "fine" pot with a switch to bypass the second PT2399 and you have long and short times that sound the same with no further degradation of the repeats!

what if you ran an 18v regulated supply and tacked a trimpot of suitable value to pull the voltage down to about 15? wouldn't that give you decent headroom without risking the chip? regulated, I can't imagine a 3 v swing...

Also, I'm in for a couple boards.

NOC3 · Post by **NOC3** » 18 Feb 2009, 01:08

Dallas wrote:You should put out a vid or at least a sound file from the unit here so we can here some of the pedal, how long those delay times get, etc.

If you used a 100k dual ganged pot for the delay times, you are looking at up to two seconds on the "long" setting. the ultra long repeats will be dirty repeats but you can get one second of cleanish repeats.

I dont really have any recording eqipment...maybe I could use my skype microphone, or as a last resort use my camera to youtube it...yuck.

Barcode wrote:what if you ran an 18v regulated supply and tacked a trimpot of suitable value to pull the voltage down to about 15? wouldn't that give you decent headroom without risking the chip? regulated, I can't imagine a 3 v swing...

Well, you don't have to use the 12v regulator. The pads are there, you can jumper them or do whatever your heart desires. You risk frying your compander at 18v...which you would also need to rebias to benifit from the higher voltages. I think 12 volts is plenty of headroom and the compander is biased to 6v for it in my schem.

Dallas · Post by **Dallas** » 27 Feb 2009, 17:00

How are the boards coming? Have they come in yet? I know you said the parts you are shipping with them will take a bit longer.

Do you have a parts list for the build? Need to find out if I have enough on hand or need to order some parts. Looking forward to the build.

tuemmueh · Post by **tuemmueh** » 16 Mar 2009, 14:55

how's the status of the boards?

NOC3 · Post by **NOC3** » 16 Mar 2009, 22:33

sorry about the tease, I ran into some money troubles and haven't ordered the boards as a result

. Once I get some extra funds available I will get these going.

WonderNoise · Post by **WonderNoise** » 23 Mar 2009, 06:21

I would be interested in getting my hands on one. It'll be fun comparing my pt2399 delay to yours and to my bucket brigade unit! Thanks for the cool thread man.

oldgravity · Post by **oldgravity** » 11 Apr 2009, 05:49

Any progress with the boards? I would be in for 1, or possibly 2.

Very cool project, nice job.

nico21 · Post by **nico21** » 16 Apr 2009, 11:06

i'll take one too !

NOC3 · Post by **NOC3** » 12 May 2009, 17:08

OK guys, I'm getting ready to start a full time summer job out of town. When I get back in August I'll have enough money to buy the boards.

oldgravity · Post by **oldgravity** » 13 May 2009, 03:59

I would be willing to buy the order of boards and sell them to everybody here who wants them, if that's ok with you, NOC3. I understand if you want to make some money for your effort, so I get it if that's not cool with you.

Brian M · Post by **Brian M** » 13 May 2009, 04:42

not only is it inefficient with available power, but LDR's dont have the tightest tolerances either. BJT works really well.

the 2399 will draw more current than the rest of the circuit though.

soulsonic wrote:Okay, I was wondering if that might be it... thanks!
Yeah, that wastes alot of current, doesn't it?
earthtonesaudio wrote:The LED is the "variable resistance." Not the most efficient way of doing things, but it should work.

svstee · Post by **svstee** » 11 Jun 2009, 16:47

I'll take one for sure! Be fun comparing this to my Echo Base and Magnus Modulus.

Paul Marossy · Post by **Paul Marossy** » 11 Jun 2009, 17:51

So... has anyone actually built this?

Dirk_Hendrik · Post by **Dirk_Hendrik** » 11 Jun 2009, 21:56

A thread I see way too late.... sorry.

a) respect, kudo's and compliments!
b) refer to the Yerasov (use search

) schematics on how to get rid of the dual gang delay time contol pot.