Messages

Hello!

I've been too enthusiastic about this build,
sorry for posting too much.

No, i don't have other delay pedals to try PT2399 with.

I will go tomorrow to shop more PT2399
From a different vendor.

But hell, i went through 6!! of the PT2399, and none work.

damn... if it's the PT2399's.

=)

-Teddy

yes, all are from the same batch
from the same vendor

yes, it's in the wet path as well.

but i have to sound probe again, to be sure about first delay line.

But when probed from after C31, i'ts hissy and dirty. (selector point A)

And, when i turn delay time to shorter, the dirtiness vanishes.
When delay time is minimum, sound is ok.

R21 checked = 220k
R22 checked = 150k

Ok, what's next?

When measuring against board GND, i get 0.00V

I put the GND of multimeter to 9V wall wart power supply -

when checking with continuity meter, i get 0.6ohms resistance, measured
from AGND/DGND to GND.

I quess, that explains why i see 5.7mV.

Well, if there's anything more that comes to mind, that would help with my build of ZPSDX,
i'd really appreciate it.

Thanks,
-Teddy

Voltages of IC3 measured against GND

1 VCC = 5.02V
2 REF = 2.436V
3 AGND = 5.5mV
4 DGND = 5.5mV
5 CLK O = 2.997V
6 VCO = 2.436V
7 CC1 = 0.690V
8 CC0 =0.690V

9 OP1-OUT = 2.437
10 OP1-IN = 2.434
11 OP2-IN = 2.433
12 OP2-OUT = 2.433
13 LPF2-IN = 2.436
14 LPF2-OUT = 2.442
15 LPF1-OUT = 2.436
16 LPF1-IN = 2.436

Voltages of IC 2 measured against GND (they are essentially the same as IC3...)

1 VCC = 5.02V
2 REF = 2.439V
3 AGND = 5.7mV
4 DGND = 5.7mV
5 CLK O = 3.043V
6 VCO = 2.436V
7 CC1 = 0.685V
8 CC0 =0.690V

9 OP1-OUT = approximately 2.45volts, every pin from 9 - 16
10 OP1-IN =
11 OP2-IN =
12 OP2-OUT =
13 LPF2-IN =
14 LPF2-OUT =
15 LPF1-OUT =
16 LPF1-IN =

Hello!

One more audio clip.
long_delay_noise_3.zip

Delay = MAX
MIX = MAX

This clearly shows the issue.

When delay is backed down, to almost minimum, then there is almost no noise.

Oh by the way, the distortion exists before the filtering section, probed it.

Thanks,
-Teddy

Hello!

What voltages do you need, specifically?

Thanks,
-Teddy

I'm not sure, if the hiss is present before or after the mode switch or mix pot.
(i will probe it today)

Hiss doesn't go away with lower levels.

Thanks,
-Teddy

No hiss in the dry signal.

-Teddy