Messages

I built a tap temp with 4 programmable presets with PedalSync MV-64 chip for AquaBoy DLX delay pedal years ago.
I still cannot grasp how this weird ground scheme works (Tourbus is positive ground +18v pedal), but finally, it worked!

Pros:
tap tempo, yes
680ms max delay (around 500ms for DMM)
you can save 4 presets for delay time and modulation

Cons:
modulation is not natural and lush as original DMM
feedback and blend is not programmable, so not that practical

Yeah, it is fixed!

I changed the wiring from true-bypass to stock wiring then the noise is completely gone.
I am not sure if the true-bypass wiring is flawed or just me.
Anyway, the noise seems to bleed from the dry signal ground, so suspected the wiring, and bam!

Thanks for the help.

Tourbus was a way harder project for me, but really rewarding. Fantastic delay!

Thomasha, the max delay time is about 480ms, and no whine from about 360ms.
I will check filter resistors and caps values.

There is no off-board wiring direct from the 18v 1A adapter and the pedal is in a grounded box.

One strange thing to me is when the blend knob turned to 100% (no dry signal) then the whine decreased and disappear completely.
Is what normally happens for clock noise?
I have limited knowledge about electronics, so hard to grasp how the clock noise affects the dry signal and not the delay signal.

My Tourbus finally working fine, with clear delay and all knobs working properly after debugging some mistakes.

But I found that when the delay knob is over 70%, high-pitched whine noise comes out.
The pitch of the noise changes when increasing delay time.

It sounds exactly like so-called clock noise or antialiasing noise.
So it cannot be eliminated? I tried to adjust the balance trim pot but no change at all.

Help plz.

The voltage reads are (seems normal except IC3 pin 1 2 3 voltage higher)

IC1   4558 1   -7.59 2   -7.58 3   -7.56 4   -15.07 5   -7.51 6   -7.58 7   -7.59 8   0 IC2   NE570 1   -14.11 2   -13.25 3   -13.25 4   -15.07 5   -13.26 6   -13.24 7   -5.08 8   -13.26 9   -13.26 10   -7.17 11   -8.85 12   -13.26 13   0 14   -13.26 15   -13.25 16   -14.17 IC3   4558 1   -7.58 2   -7.58 3   -7.56 4   -14.98 5   -7.01 6   -7.08 7   -7.08 8   0

IC4   4558 1   varies 2   -7.19 3   -6.9 to -8 4   -15.16 5   varies 6   -6.9 to -8 7   varies 8   0 IC5   CD4047 1   -7.73 2   -7.34 3   -7.3 4   0 5   0 6   0 7   -15.16 8   -15.16 9   -15.16 10   -7.59 11   -7.59 12   -15.19 13   -7.72 14   0 IC6   4558 1   -6.57 2   -3.35 3   -3.47 4   -14.98 5   -7.56 6   -7.58 7   -7.58 8   0

IC7   MN3005 1   0 2   -7.6 3   -10.2 4   -10.21 5   -15.16 6   -7.59 7   7.84 8   -14.19 IC8   4558 1   -7.58 2   -7.58 3   -7.55 4   -14.96 5   -8.56 6   -8.58 7   -8.02 8   0 IC9   MN3005 1   0 2   -7.59 3   -10.38 4   -10.34 5   -15.16 6   -7.59 7   -8.6 8   -14.19

Hello,
I built a moodring reverb pedal. It sounds great but has quite amount of white noise.
There is no white noise when mix knob all the way down, which suggest the noise came from reverb or delay stage.
Noise from belton brick? or from PT delay?
Let me know if you have any experience or suggestions.

Thanks!

Hello all,

I am building Aqua Boy Deluxe.
The delay works nice, but the modulation speed is way slow (from about 0.5s to over 1s with knob adjustment).

I have little idea about LFO, so let me know where can I start debugging.

I am using VTL5C3, 9v supply, after replacing r50&51 to 5.1k, the amount of modulation works fine.

I checked resistor and capacitor values, and it seems ok.

Thanks!
Brian

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I checked the values again today, and found I used wrong value on r47 (supposed to 4.7k but used 47k.. tricky numbers)