new question: JLI-2555 alternative? planning a large diaphragm mic for podcasting, speech, YT

[Hednar]

Hi,
I like to build a microphone with a long adjustabe knee like arm. The purpose is podcasting, speech, YT and it will have a USB A/D interface . The preamp and ADC will live in the foot like box whre the knee arm is attached. The microphone should have a good background noise surpression. It should pick up sound from the front mainly. My guess is that I have to use a electret capsule. So I can keep the circuit more simpel.

My new question:
-can you recommand a alternative to the JLI-2555BXZ3 capsule? Not pricier then 100$.

Any thought and comment is apreciated!

Hednar

 

[Icantthinkofaname]

Why do you think you need an electret capsule? If you have a proper interface that can provide phantom power, or you have a preamp (and a phantom power supply if the preamp doesn't provide it) and A/D converter you should be able to use an externally polarized capsule. I'd say just get a cheap good mic and a boom arm/scissor mountain, and a shockmount that fits it.

If you want to build one, still use a separate boom/scissor arm. A cheap one is like $40, and you'll probably have a way harder time trying to build one

Also why do you want an alternative to the TSB2555? Microphone-Parts sells them for like $20-40 depending on whether you want a mount and wires. If you need better sounding capsules there are a couple on AliExpress, no specific model numbers but one apparently has a nice scooped sound and one is pretty flat.

There are plenty of schematics for LDC mics built into smaller bodies like the BM-800 ones. You could use a small diaphragm capsule too. There are a lot of existing resources that should make building a mic pretty easy.

 

[Hednar]

Why do you think you need an electret capsule? If you have a proper interface that can provide phantom power, or you have a preamp (and a phantom power supply if the preamp doesn't provide it) and A/D converter you should be able to use an externally polarized capsule. I'd say just get a cheap good mic and a boom arm/scissor mountain, and a shockmount that fits it.

If you want to build one, still use a separate boom/scissor arm. A cheap one is like $40, and you'll probably have a way harder time trying to build one

Also why do you want an alternative to the TSB2555? Microphone-Parts sells them for like $20-40 depending on whether you want a mount and wires. If you need better sounding capsules there are a couple on AliExpress, no specific model numbers but one apparently has a nice scooped sound and one is pretty flat.

There are plenty of schematics for LDC mics built into smaller bodies like the BM-800 ones. You could use a small diaphragm capsule too. There are a lot of existing resources that should make building a mic pretty easy.

thank you Icantthinkofaname.
I like to get more precise about the design. The part that is in front of the face should be small and light in weight. In my thoughts just the capsule in a case. Then all wires run inside the tubing of the scissor arm(s). This arm will be self made and will have a special light design. In the foot will be all the electronics and it should be driven by the 5 Volt USB. Thats why I thought its more simple to go with a electret. It seems that the choice is small for electret capsule. I consider to go with a real condenser capsule from Aliexpress, good point Icantthinkofaname. I am completley new to building a microphone.

 

[k brown]

I find this one sounds nicer than 2555:
https://www.jlielectronics.com/microphone-capsules/jli-3412/
Also this one just unearthed by kingkorg (haven't received mine, so haven't heard it yet):
https://www.ebay.com/itm/255415516289?hash=item3b77f37c81:g:F-oAAOSwyGxiIGZ3

 

[Icantthinkofaname]

I find this one sounds nicer than 2555:
https://www.jlielectronics.com/microphone-capsules/jli-3412/
Also this one just unearthed by kingkorg (haven't received mine, so haven't heard it yet):
https://www.ebay.com/itm/255415516289?hash=item3b77f37c81:g:F-oAAOSwyGxiIGZ3

These would be the AliExpress ones I mentioned. This the link to the new one https://m.aliexpress.com/item/1005003692703403.html the eBay listing doesn't really ship anywhere right now.

 

[Hednar]

I will consider your inputs and I will report the ongoing of this make.
Thanks to all!

 

[Hednar]

Q #3: I tried to compare the JLI-1813 and JLI-3412AU in respect of directivity. Can you guys please help me to answer that? Witch one has the narrower beam?



thanks again!

 

[Icantthinkofaname]

You really can't tell from diagrams like that.

 

[Hednar]

thanks.

 

[ccaudle]

In my thoughts just the capsule in a case. Then all wires run inside the tubing of the scissor arm(s).

Condenser capsules have very high impedance, it would likely be better to put the JFET of the impedance matching circuit at the capsule, rather than trying to run the wires from a capsule all the way through the arm to the base.

 

[Hednar]

yes, thank you ccaudle, I will do it that way.

How about the voltage. I guess it is better to have more volage applied then 1 or 2 V?

In general a 18 mm capsule produces less noise and hiss compared to a 33 mm?

In general a smaller capsule gives less signal?

 

[ccaudle]

How about the voltage. I guess it is better to have more volage applied then 1 or 2 V?

Voltage to what? You have not provided a schematic to review.

In general a 18 mm capsule produces less noise and hiss compared to a 33 mm?

A larger capsule should have better noise performance than a smaller capsule.

In general a smaller capsule gives less signal?

Correct. The trade-off is usually smaller capsule, worse signal-to-noise ratio, but better high frequency accuracy. Larger capsule, lower noise, but more uneven high frequency response, especially off-axis.