Re: Pat's Mic (Fetzer Valve Mic)
Will try to share some tests next Friday or Saturday.
Regards!
HL
By
Homero Leal
·
#33986
·
|
Re: Pat's Mic (Fetzer Valve Mic)
*Why do you need RD1 and RD2, wouldn't be one RD enough? Same for RS.*
Resistor values for RD and RS need to be very specific, depending on IDSS,
VP JFET values, and input voltage. Two resistors are
By
Homero Leal
·
#33985
·
|
Re: Pat's Mic (Fetzer Valve Mic)
Any recording tests you could share?
By
M H
·
#33984
·
|
Re: Bipolar condenser for P48 basic with EM272?
Yes.
Only resistances are a source of brownian noise. Reactances are not.
This is where it takes some discussion.
I take it as a 3.2uF capacitor, that has a reactance of 1Kohm at 50Hz. Its
By
Jerry Lee Marcel
·
#33983
·
|
Re: Bipolar condenser for P48 basic with EM272?
Unless there is a need for a high pass filter, using a larger coupling cap won't hurt. Something that's often forgotten is the series reactance of a cap is a noise source, just like a series
By
Henry Spragens
·
#33982
·
|
Re: Bipolar condenser for P48 basic with EM272?
Understood. That last explanation about Bipolar was really refreshing from the old days, thanks!
Why people don't use? 10uf? 63V, or even 10uf 100V?
Is it only for the space it takes physically
By
Sey
·
#33981
·
|
Re: Bipolar condenser for P48 basic with EM272?
An aluminum electrolytic capacitor consists of two Al foil electrodes separated by a conductive electrolyte. Al forms an oxide coating on the surface on contact with air or water, and the oxide
By
Henry Spragens
·
#33980
·
Edited
|
Re: Bipolar condenser for P48 basic with EM272?
We are probably worrying about nothing TBH. Jules @ Sound Sleuth designs excellent circuits, if he says it's good, it'll likely be good.
I can only see a problem if you're intending on capturing low
By
michaeljtbrooks@...
·
#33979
·
|
Re: Bipolar condenser for P48 basic with EM272?
The other issue is size of the capacitor. I¡¯m the 3.3uF 63V guy. They work great and physically allow you to build the SimpleP48 into the XLR connector. I use this with my ZoomF6.
Best
By
Jules Ryckebusch
·
#33978
·
|
Re: Bipolar condenser for P48 basic with EM272?
Thanks for the explanation Michael,
the point about tolerance is really good. My plan is to connect that Mic's via XLR to a new Zoom F3, but better for a capacitor rated for at least 50V like this
By
Sey
·
#33977
·
|
Re: Bipolar condenser for P48 basic with EM272?
I've used both polar and bipolar in the signal lines in microphones. It doesn't make much difference so long as the capacitor value is sufficiently high to pass the low frequencies.
A bipolar
By
michaeljtbrooks@...
·
#33976
·
|
Bipolar condenser for P48 basic with EM272?
Hi all!
After a lot of reading, I see for short cables (less than 2 meters) the Simple P48 circuit is enough for a good quality build.
My question here is: I see a lot of people talk about taking
By
Sey
·
#33975
·
|
Re: Budget self-made condenser capsule (PCB based backplate!)
Fig-8.doc in my FILES directory describes a Fig-8 capsule I designed some 40+ yrs ago for Calrec.? It has sources for 5 & 10 um Aluminised Mylar and other useful info.
By
Richard Lee
·
#33974
·
|
Re: Budget self-made condenser capsule (PCB based backplate!)
Excellent result -- well done! :)
I must confess I didn't think I was going to hear something quite that impressive, when I first downloaded your mp3....
If one could create a version with a
By
Arjay1949
·
#33973
·
|
Re: Budget self-made condenser capsule (PCB based backplate!)
Excellent!!!! More microphone Instructables!
Best Regards,
Jules Ryckebusch
By
Jules Ryckebusch
·
#33972
·
|
Re: Budget self-made condenser capsule (PCB based backplate!)
Full Instructable now available here:
https://www.instructables.com/DIY-Large-Diaphragm-True-Condenser-Microphone-Caps/
By
michaeljtbrooks@...
·
#33971
·
|
Re: Microphone w/ built in compression? ¡°Lamplifier¡±
Very interesting!
By
M H
·
#33970
·
|
Re: Budget self-made condenser capsule (PCB based backplate!)
**
Search for:
V-PROTECH Premium FOIL Thermal Emergency Blanket
**
For the UK:
https://www.amazon.co.uk/V-PROTECH-Premium-Emergency-Survival-150x100cm/dp/B09TRZT5T1
I deliberately went for the
By
michaeljtbrooks@...
·
#33969
·
Edited
|
Re: Budget self-made condenser capsule (PCB based backplate!)
alloy foil from old wax capacitors as diaphragm. have used in home made ribbon mics.
________________________________
Sent: Wednesday, 13 April 2022 8:33 AM
To: [email protected]
By
ato bec
·
#33968
·
|
Re: Budget self-made condenser capsule (PCB based backplate!)
where do you get this sheet?
I bet not all space blankets are the same and this thin.
By
Mic Scharf
·
#33967
·
Edited
|