#### Willen

##### Well-Known Member
Hi,
These type of 25mm condenser capsule has been rated around $4 in some sites. Cheapest 34mm capsules costs more than$20 in same site. So comparatively the 25mm sounds pretty cheap. I am just curious about its internal structure. Are they true condenser capsule which needs 48V phantom power? Or are they electret capsule which has FET inside?

If anyone have used already then I would be curious to read about its performance? (If really it has 25mm or little bit less diameter diaphragm then I hope it should perform well.)

#### Attachments

• 265.5 KB Views: 7
• 316.8 KB Views: 7

#### rjenkinsgb

##### Well-Known Member
Hi Willen,

I've seen those online & just looked at a few listings again, but nothing makes it 100% clear what they are.
They could be electret without a built-in preamp, or they could be condenser.

The only way to know is try one without bias voltage to start with and see if it gives any output?

#### audioguru

##### Well-Known Member
Why would a company make those things without spec's and applications for them?

#### Willen

##### Well-Known Member
Why would a company make those things without spec's and applications for them?
I think these are Chinese and they manufacture no spec parts and sell to another manufacturer. The 2nd manufacturer just labels it and sell with brand name and spec.

I tested small electret capsule and they sounds pretty nice high frequency but poor with low. So I guess the 25mm capsule should work nice with low frequency, because of its large diaphragm.

#### audioguru

##### Well-Known Member
Most electret mic capsules are about 6mm in diameter and have a very flat frequency response from about 20Hz or lower to 20KHz or higher like this one:

#### Attachments

• 18.5 KB Views: 8

#### Willen

##### Well-Known Member
Most electret mic capsules are about 6mm in diameter and have a very flat frequency response from about 20Hz or lower to 20KHz or higher like this one:
If the capsule has no internal FET then one can use very low noise FET like 2SK118 and can achieve nice quality audio. Wow!

#### rjenkinsgb

##### Well-Known Member
Hi Willen,
yes, I would be very interested to know how well they work, at that price!

AG - That Panasonic capsule is incredibly good, though they seem to be discontinued.
Small electret capsules with a genuinely good frequency response are relatively scarce, most have either poor low end, poor high end, or both.

A lot of mics sold as "Condenser" (with the implication that they are true condenser rather than electret) are scams, usually with tiny electret capsules.
Even some big-name ones are electret, though they avoid using that word!

eg. AT2020 "Studio condenser" microphone - from the specs:
"ELEMENT Fixed-charge back plate, permanently polarized condenser"
An electret, in other words..

Traditional "Studio condenser" class mics have capsules such as this:

#### audioguru

##### Well-Known Member
I think that all electret mics use a low noise Jfet in them.

Last edited:

#### Willen

##### Well-Known Member
A 1" diameter mic produces fluctuations and directionality in high audio frequencies. Its diaphragm might be too heavy so it produces booming bass sounds instead of having a non-resonant tight response.
But 34mm large diameter true conderser microphone has high end of professional quality, equally great at high and low.

#### audiosource123

##### New Member
Willen I will answer Your question again - the mics are having no FET inside and are not polarised.
I tested them using schoeps original body - preamp.
Sound is quite ok, but not overhelming.
It is comparable to most chinese low - mid cost mics.
What made me try these is the fact that chinese do
sell some good stuff for no money, after they produced long enough parts for more expencive products.
I will use them for special multichannel recording, and they are perfect for my purpose.
If You are able to build circuit to polarise and properly power
true condenser Mics, than it is a more than good Mic Capsule for the price.
I know that maybe there are Electrets arround looking similar,
but this one which is currently offered all over the place on ebay,
ali, banggood etc is as I am telling You : true condenser.
If You want similar - and easier solution,
take JLI TSB 2555 - it is polarised, and that will make circuit much simpler.
2 FETs and few resistors, capacitors and off You go

#### Willen

##### Well-Known Member
Willen I will answer Your question again - the mics are having no FET inside and are not polarised.
I tested them using schoeps original body - preamp.
Sound is quite ok, but not overhelming.
It is comparable to most chinese low - mid cost mics.
What made me try these is the fact that chinese do
sell some good stuff for no money, after they produced long enough parts for more expencive products.
I will use them for special multichannel recording, and they are perfect for my purpose.
If You are able to build circuit to polarise and properly power
true condenser Mics, than it is a more than good Mic Capsule for the price.
I know that maybe there are Electrets arround looking similar,
but this one which is currently offered all over the place on ebay,
ali, banggood etc is as I am telling You : true condenser.
If You want similar - and easier solution,
take JLI TSB 2555 - it is polarised, and that will make circuit much simpler.
2 FETs and few resistors, capacitors and off You go
Some of these have been rated $20 and some around$4 in Aliexpress. Both looks same and price is making me confused about the type of capsule.

#### audiosource123

##### New Member

they are all the same, no matter the price.

they all paste same description :
------------
Description:

- Brand new and high quality.

- Made of aluminum alloy, durable and sturdy enough for long time using.

- 25 mm condenser microphones core,easy to install.

- High fidelity and anti-interference condenser microphone sound collection device.

- Professional large diaphragm microphone replacement part,perfect choice for live broadcast blogger.

Specification:

- Material : Aluminum Alloy

- Size : Approx.2.5x1 cm / 0.98x0.39 inch
-----------
I bought mine as pack of 2 for 10 Euro