Topic: Nak 300 caps max voltage??

[Scooter]

Anybody know the max voltage the Nak 300 caps can take?? 

[Roving Sign]

The Primo specs say 1.1.-9V

Omnis...
http://www.primomic.com/products/em-23.htm

Assuming the card caps are the same - but the voltage isn't listed in the spec...

http://www.primomic.com/products/em-21.htm

[Scooter]

crap.  i thought i read somewhere that someone was feeding them 30v??  maybe it was the sanken mod??

[audBall]

I dunno how much this relates to the 300s, but I'm assuming Sank would do the same:

http://taperssection.com/index.php/topic,61569.msg1095678.html#msg1095678

[Scooter]

well, looks like 10v is the magic number then, thanx...

[audBall]

well, looks like 10v is the magic number then, thanx...

According to Sank, it's 20v.  <See link above and scroll down>

[Scooter]

nice, thanks for sharing your correspondence w/ Sank!

[scottwu]

The Primo EM-23 capsule (if it's the same as the Nak CP 1 or 2) has no built-in FET and the 1.1V - 9V spec makes no sense. There is no voltage applied to the capsule in the CM-300. The 9V is for the discrete impedance converter that sits below the little gold spring loaded button.

[Roving Sign]

The Primo EM-23 capsule (if it's the same as the Nak CP 1 or 2) has no built-in FET and the 1.1V - 9V spec makes no sense. There is no voltage applied to the capsule in the CM-300. The 9V is for the discrete impedance converter that sits below the little gold spring loaded button.

The spec is from the Primo website....?

[Church-Audio]

The Primo EM-23 capsule (if it's the same as the Nak CP 1 or 2) has no built-in FET and the 1.1V - 9V spec makes no sense. There is no voltage applied to the capsule in the CM-300. The 9V is for the discrete impedance converter that sits below the little gold spring loaded button.

Increasing the voltage to the fet does not increase the SPL handling of the mic unless we are talking going from 3 volts to 10 volts, anything over 5 volts will work to a max of 12.00 volts. Going over that is not going to help reduce distortion or performance.

Chris

[Church-Audio]

The Primo EM-23 capsule (if it's the same as the Nak CP 1 or 2) has no built-in FET and the 1.1V - 9V spec makes no sense. There is no voltage applied to the capsule in the CM-300. The 9V is for the discrete impedance converter that sits below the little gold spring loaded button.

The spec is from the Primo website....?

There is no fet inside the capsule. Its just a condenser capsule that needs the impedance converter below it in order to operate.

Chris

[scottwu]

One can do a lot better than the original circuit. Without too much stuff I get about 34mV @ 94dB SPL with ~ 17dBA self noise (can be improved) and >10V p-p @ .5% distortion right out of the capsule impedance converter with a special circuit. I'm not a taper just an engineer doing a project on charge amplifiers. After thinking about it taking a lot of gain right at the capsule flies in the face of general practice it seems, many mikes have an attenuator right at he input. So I figure for a nice acoustic guitar recording or general ambient level stuff you could go without a preamp, but does stuff like this have any real use?