duo phase capacitor value

[NickC]

i am building a duophase, i noticed i miss a 1000pf c4A capacitor, at the moment i only have a 1500pf capacitor, could i mount it to test the pedal or i could damage it?

thank you

 

[Mcknib]

No that'll be fine you won't damage it

 

[NickC]

thank you, i finish it and it sound amazing!
just a question , i noticed that phasor B sounds warmer than phasor A, is it just my impression?

 

[Nostradoomus]

Could just be how you have the trim pots set. Side B uses an extra opamp and a few more resistors for the sync switching so that could be it too, but I’d say it’s the trimmers haha.

 

[Chuck D. Bones]

They should sound identical, so it's most likely the trimmer settings. Could also be LDR variation or positioning. Can we see a pic of the board?

 

[NickC]

uhmm at the end instead of the 1000ph(1nf) capacitor I put one 10000pf (10nf) in the C4A position

but i think it's the trim pots settings, i made it by ears in a dark room lol, despite everything I like the warmer sound of the phasor B both alone and in series with the phasor A.

The phasor B in this moment give me the Maestro MP-1 flavor i like it. (i'd like a Maestro phaser PCB! )

 

[NickC]

 

[Chuck D. Bones]

uhmm at the end instead of the 1000ph(1nf) capacitor I put one 10000pf (10nf) in the C4A position

but i think it's the trim pots settings, i made it by ears in a dark room lol, despite everything I like the warmer sound of the phasor B both alone and in series with the phasor A.

The phasor B in this moment give me the Maestro MP-1 flavor i like it. (i'd like a Maestro phaser PCB! )

C4A = 10nF will roll off the wet signal above 3.3KHz in channel A.

I just looked at the MP-1 schematic. 6-stage OTA phase shifter, the last stage is fixed phase. The LFO approximates a sine wave by filtering a triangle wave. Best part: the feedback control is labeled "BALLS."

 

[NickC]

C4A = 10nF will roll off the wet signal above 3.3KHz in channel A.

I just looked at the MP-1 schematic. 6-stage OTA phase shifter, the last stage is fixed phase. The LFO approximates a sine wave by filtering a triangle wave. Best part: the feedback control is labeled "BALLS."

Thank you for the info, I'm waiting for the shipment 1n cap to put in C4A.

I have set the trimmer right and now the phasor a and b sound identical.

There is a maestro project kit in musikding site web but i dont know how it sounds, there was some youtube vids about madbean stage fright clone that sounds really good instead.