PUP: a host of Perfectly Usable Phasers [documentation]

[Rodri_DiY]

Hey there! I've put together the pup 2 with a protoboard and it seems to work just fine, but I have a constant noise, like a mosquito's buzz, it seems to be the same frequency of the open E at 1st string.

Any thoughts about the issue? I've triple checked every componen and connection.

Thank!

[Rodri_DiY]

Hey there! I've put together the pup 2 with a protoboard and it seems to work just fine, but I have a constant noise, like a mosquito's buzz, it seems to be the same frequency of the open E at 1st string.

Any thoughts about the issue? I've triple checked every componen and connection.

Thank!

Solved! Seems to be some ground loop. Just put an extra connection between board ground and a jack ground.

[Rodri_DiY]

Hello! I've asambled the 4 stage version, it works great! but I have a problem, it makes a click like sound, always at the same rate as the pot sets. What can be causing this noise?

Thanks!

[dylan159]

Hello! I've asambled the 4 stage version, it works great! but I have a problem, it makes a click like sound, always at the same rate as the pot sets. What can be causing this noise?

Thanks!

If it's faint, it's the lfo comparator coupling to the signal path. Try moving the rate pot wires or keep that stage away from the signal. The lfo in the trimless should be less susceptible because the edges are a bit more rounded

[Rodri_DiY]

If it's faint, it's the lfo comparator coupling to the signal path. Try moving the rate pot wires or keep that stage away from the signal. The lfo in the trimless should be less susceptible because the edges are a bit more rounded

great! thanks! will do

[Rodri_DiY]

Hi there! Sorry if I ask too many questions, I'm really into this project!

Do you think it's ok if I add a blend control like this? Is there a better way?: (PUP4)

Pot lug 1 to TL074 U3B 6
Pot lug 2 to TL074 input
Pot lug 3 to TL074 U1A 3

I've tried various B type pots, from 10k to 1M and don't know why, the 50k was by far the less noisy at 0% (no fx)

Thanks!!

[dylan159]

Hi there! Sorry if I ask too many questions, I'm really into this project!

Do you think it's ok if I add a blend control like this? Is there a better way?: (PUP4)

Pot lug 1 to TL074 U3B 6
Pot lug 2 to TL074 input
Pot lug 3 to TL074 U1A 3

I've tried various B type pots, from 10k to 1M and don't know why, the 50k was by far the less noisy at 0% (no fx)

Thanks!!

No, that won't work well at all with an inverting amplifier. You should split the feed resistors and shunt them, something like the attached snippet, but ground is Vr.

Senza nome.png (2.28 KiB) Viewed 253 times

[Rodri_DiY]

No, that won't work well at all with an inverting amplifier. You should split the feed resistors and shunt them, something like the attached snippet, but ground is Vr.
Senza nome.png

Excelent! thanks! every ground is Vr in the snippet or just the pot one?

[dylan159]

No, that won't work well at all with an inverting amplifier. You should split the feed resistors and shunt them, something like the attached snippet, but ground is Vr.
Senza nome.png

Excelent! thanks! every ground is Vr in the snippet or just the pot one?

pot and +in. obviously not the output pulldown.

[Rodri_DiY]

great! thanks, I supposed that.

So is this ok? in this diagram I should split into let's sayfor example two 4.7k resistors each R33 and R34?

[dylan159]

great! thanks, I supposed that.

So is this ok? in this diagram I should split into let's sayfor example two 4.7k resistors each R33 and R34?

It depends on the pot you're going to use and how you want to taper the control. You can mess with the attached spreadsheet.

[Rodri_DiY]

It depends on the pot you're going to use and how you want to taper the control. You can mess with the attached spreadsheet.

Thanks you so much!