PUP: a host of Perfectly Usable Phasers  [documentation]

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Rodri_DiY
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Post by 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!

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Rodri_DiY
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Post by Rodri_DiY »

Rodri_DiY wrote: 12 Mar 2023, 16:08 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.

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Post by 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!

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Post by dylan159 »

Rodri_DiY wrote: 15 Mar 2023, 17:18 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
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Post by Rodri_DiY »

dylan159 wrote: 15 Mar 2023, 17:55 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

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Rodri_DiY
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Post by 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!!

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Post by dylan159 »

Rodri_DiY wrote: 16 Mar 2023, 01:43 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
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Post by Rodri_DiY »

dylan159 wrote: 16 Mar 2023, 09:52 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?

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Post by dylan159 »

Rodri_DiY wrote: 16 Mar 2023, 12:58
dylan159 wrote: 16 Mar 2023, 09:52 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.
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Post by 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?

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Post by dylan159 »

Rodri_DiY wrote: 16 Mar 2023, 17:58 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.
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Post by Rodri_DiY »

dylan159 wrote: 19 Mar 2023, 15:21 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!

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Post by t1redhands »

If I wanted to add a depth pot to the LFO, would it be as simple as adding a pot to ground right before R11? Kind of like the depth knob for the CE-2?

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Post by dylan159 »

t1redhands wrote: 09 Sep 2023, 21:50 If I wanted to add a depth pot to the LFO, would it be as simple as adding a pot to ground right before R11? Kind of like the depth knob for the CE-2?
I'm assuming you mean the PUP 4 with the trim them. That is the most straightforward to add depth to. Not ground anyway, but a to a mid-supply reference which isn't the main one. You might get away with using the same one as rate without too much asymmetry, or make another similar one. If this voltage isn't half supply you can make it drift higher or lower while you attenuate it, to your advantage.
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Post by t1redhands »

dylan159 wrote: 10 Sep 2023, 00:15
t1redhands wrote: 09 Sep 2023, 21:50 If I wanted to add a depth pot to the LFO, would it be as simple as adding a pot to ground right before R11? Kind of like the depth knob for the CE-2?
I'm assuming you mean the PUP 4 with the trim them. That is the most straightforward to add depth to. Not ground anyway, but a to a mid-supply reference which isn't the main one. You might get away with using the same one as rate without too much asymmetry, or make another similar one. If this voltage isn't half supply you can make it drift higher or lower while you attenuate it, to your advantage.
Excellent, that makes sense, thanks!

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