SE Electronics Z3300a

[Emmathom]

what phantom voltage do you have without load in Presonus?

Let's remember we have 48,5v Presonus

 

[micolas]

Let's remember we have 48,5v Presonus

have you measured now?

 

[micolas]

Are JFETs left BIASed?

 

[micolas]

BIASing jFET can change the voltage after R5 and others

 

[Emmathom]

BIASing jFET can change the voltage after R5 and others

haven't done Jfet biasing yet... it's hard to do everything at the same time you know...
I intervened so much on this circuit...
Jfet D is now 15,68v and S is now 0,360v

 

[micolas]

haven't done Jfet biasing yet... it's hard to do everything at the same time you know...
I intervened so much on this circuit...

are there biases left over from last time?

 

[Emmathom]

are there biases left over from last time?

Jfet D is now 15,68v and S 0,360v

 

[micolas]

replace the 9.1v zener in series with D1 and D2, with another 8.2v

 

[micolas]

just tell me by comparison between orig and mod
I have everything in mind

 

[Emmathom]

z8,2v > Polar 58,10 / R5 20,50

 

[micolas]

So what about these values?
Is Uphantom fluctuating?

 

[Emmathom]

So what about these values?
Is Uphantom fluctuating?

I put Orig-mod aside as there's nothing more to do on it so its values are still the same (see pict.)

 

[micolas]

Post everything compared between Orig and Mod

 

[micolas]

did the Phantom voltage drop in Presonus today?

 

[Emmathom]

here are the measurements I just did

 

[micolas]

please put a table with both microphones, I'm using my mobile phone, I'm tired, I can't analyze, only visually

 

[Emmathom]

please put a table with both microphones, I'm using my mobile phone, I'm tired, I can't analyze, only visually

I don't understand what you ask for : here you have a table with the 2 mics... ?
Orig-mod is the original mic / Mod is the one we're working on...
Orig-mod because it has been modified by changing the transformer...

 

[micolas]

values for MOD are better, close to my microphone

 

[Emmathom]

values for MOD are better, close to my microphone

maybe, but I'm not going to operate on the Orig-mod

 

[micolas]

there is delay between read, translate, write, post