freestompboxes.org

I just remembered, I snapped these pics a while back. Once I have some time and it's light outside, I'll snap some better pics if there is any interest. Doesn't look like an easy trace.

It has a Pt2399 and a Ne570 D compandor as well as a TL061CP and two JRC5534 DD. Two 78L05 are also in there. The thing is very well build, two pcbs that are connected via a cable strip. One holds the pt2399, compandor and the pots and the other holds some opamps, the jacks and switch. I wonder what the second 5v voltage regulator is for. the pt2399 only needs one, the opamps dont and the ne570 needs at least 6v.

Seiche wrote:I wonder what the second 5v voltage regulator is for.

More current?

Here was me thinking it would be analog...

A PT2399 generated chorus?

newly wrote:A PT2399 generated chorus?

it's not unheard of

https://www.freestompboxes.org/viewtopic ... 13&t=10276

LaceSensor wrote:Here was me thinking it would be analog...

analog bjf design? get outta here!

newly wrote:A PT2399 generated chorus?

There are at least three that I can think of over at DIYstomp.

the eartQuaker devices chorus is also PT2399 based.

my friend has it but he is in London so I cant make gutshot..

it sounds like shit anyway.

newly wrote:A PT2399 generated chorus?

That's the easy part.

Now,
Companding is usually used to inprove signal to noise ratio in delay lines where the sampling gets real shitty. Read: Analog delays, When the sampling rate is higher the signal to noise ratio stays better and companding... is for wankers.

Except there is a case where sampling is not even an issue and the delay times are really short. That's the Ibanez PH99.... which uses a compander... uberwanking..

Dirk_Hendrik wrote:

newly wrote:A PT2399 generated chorus?

That's the easy part.

Now,
Companding is usually used to inprove signal to noise ratio in delay lines where the sampling gets real shitty. Read: Analog delays, When the sampling rate is higher the signal to noise ratio stays better and companding... is for wankers.

Except there is a case where sampling is not even an issue and the delay times are really short. That's the Ibanez PH99.... which uses a compander... uberwanking..

Would that be a Wanking Panda ?

Hello,
I received from my friend couple of pics with guts of that beast. It looks like pretty immense design - PT2399 with NE570 compander and 3 opamps (TL061 and 2x 5534). Hope pics will be helpful. I'm attaching them in zip archive.

inspired by the lil angel?

Knowing Bjorn, the 5534s are the input and output/mixer stages since they're rail to rail and there's only a single supply line. The TL061 is the oscillator, and the delay line is companded. Wouldn't be terribly surprised if the basic method of chorus is similar to that of the Little Angel, but the rest of the circuit is likely fairly different.

Lots of pictures here: viewtopic.php?f=7&t=21965

But still no trace...

Dirk_Hendrik wrote:

newly wrote:A PT2399 generated chorus?

That's the easy part.

Now,
Companding is usually used to inprove signal to noise ratio in delay lines where the sampling gets real shitty. Read: Analog delays, When the sampling rate is higher the signal to noise ratio stays better and companding... is for wankers.

Except there is a case where sampling is not even an issue and the delay times are really short. That's the Ibanez PH99.... which uses a compander... uberwanking..

That may be the case, but the PT2399 tends to go into clipping very easily. If you compress / limit on the way in and expand on the way out, you can get all the effect without the risk of getting that nasty distortion.

I would really like to see this one retraced.
Not to build a clone, but maybe to learn s.th. to make an improved version of the "Dimension-P" chorus, which is based on the PT2399 as well...

Hcvlled my localo there

Oh yes I wanted to use a compander to lower noise of the design I made and you might get a laugh ot of it that I called my local submarine enginer and discussed
superhetorodyne modulators and I banged my head against the garagewalls until it dawned on me from radio school that yes you can current modulate...

The one thing that bugs me isthat 35 years of learning memories still take hours to come.


F... yeas I recall being young and the eagerness

At your service
BJ

roseblood11 wrote:I would really like to see this one retraced.
Not to build a clone, but maybe to learn s.th. to make an improved version of the "Dimension-P" chorus, which is based on the PT2399 as well...

Hi there,


Right what would you like to learn?


At your service
BJ

designer of Electric blue chorus
BJF electronics
Sweden

I'd guess to see how you implemented the compander with PT2399. That is the thing that i haven't seen done too many times.
+m