PUP: a host of Perfectly Usable Phasers [documentation]
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!
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 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!
- dylan159
- Resistor Ronker
Information
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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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!!
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
- Resistor Ronker
Information
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.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!!
Personal blog/archive: https://bentfishbowl.wixsite.com/electronics
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
- dylan159
- Resistor Ronker
Information
pot and +in. obviously not the output pulldown.
Personal blog/archive: https://bentfishbowl.wixsite.com/electronics
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
- dylan159
- Resistor Ronker
Information
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.
- Attachments
-
- 1KnobBlend.ods
- (31.87 KiB) Downloaded 67 times
Personal blog/archive: https://bentfishbowl.wixsite.com/electronics
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
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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?
- dylan159
- Resistor Ronker
Information
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.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?
Personal blog/archive: https://bentfishbowl.wixsite.com/electronics
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
Find me at https://discord.gg/bMuhX4TkZM Audio Electronics discord server.
Excellent, that makes sense, thanks!dylan159 wrote: ↑10 Sep 2023, 00:15I'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.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?