DIY mic preamp possible ?

Buzzy · 19th October 2009, 10:23 AM

Hi ! I have just bought a behringer ECM8000 mic to measure my new DIY speaker. But i just realised that a mic preamp is needed to connect the mic to my pc for making measurements. I am still a student and do not have enough funds for buying a commercial preamp for the mic as i have almost emptied by pockets building the DIY speaker. After searching i found INA163 chip by TI. Is the mic preamp schematic in the datasheet suitable for use with the ECM8000 mic that i have bought ?

Ron E · 19th October 2009, 10:51 AM

That schematic leaves out the power supply for the chip and the phantom supply, and not being an EE there might be some practical concerns as well.
.
These are the two typical solutions:
rolls mp13 - Google Product Search
xenyx 802 - Google Product Search

The cheapest way to make a mic and preamp is probably to forget about the ECM-8000 and buy a panasonic capsule and make a Wallin preamp (or look at the one on Elliot Sound pages)

You can just use an electret capsule connected to the mic input, but this tends to be quite noisy on most computers. Probably doesn't matter for measuring, though.

Buzzy · 19th October 2009, 10:51 PM

Can any mod help me move this thread to analog line level section ? Thank you.

max426 · 19th October 2009, 11:19 PM

Here is an inexpensive mic & preamp you can build
System Test

jim

Minion · 19th October 2009, 11:52 PM

You can also buy one of those cheap art or behringer preamps for like $30 ....

scott wurcer · 20th October 2009, 12:16 AM

Why not support one of our advertisers? Seventh Circle Audio has an entry level ($79) kit that is based on a great circuit. You could not put the bag of parts together for that. No commercial interest, goes without saying.

fotios · 06:52 AM

Quote:

Originally Posted by Buzzy

Hi ! I have just bought a behringer ECM8000 mic to measure my new DIY speaker.....for use with the ECM8000 mic that i have bought ?

This is exactly what you need and much more. Do It Yourself, like me. I had the same need like you before 3 years. The cost it is around 30Euro (included the chassis). This mic. preamplifier except that it offers the correct phantom power for the ECM8000, with the addition of a simple switch can accept as well dynamic microphones and offers a stereo output; you can use it as well as mono via the pan-pot (balance) taking thus the signal either from the left or right output. I have the full documentation of construction, as well its performance in: http://www.eal.gr/MICROPHONE%20PREAMPLIFIER.htm
It is fully tested for use with the Audua inc. Speaker Workshop free software.

Regs
Fotios

fotios · 20th October 2009, 07:20 AM

Another 2 shots with the ECM8000 clamped on the input XLR. You can see as well the details of front panel.
In the 3rd picture, you can see (or anyone who is interested) my own version of the jig-box which is needed for use with the Speaker Workshop. It is based on the Carlo Negri design.
There is as well a compensation file for the ECM8000 to put in your measuring software in the mic. calibration menu.

Bonsai · 20th October 2009, 09:30 AM

Very nice Fotios!

Buzzy · 20th October 2009, 11:20 AM

Wow Fotios You are a genius. Thanks. This circuit has so many components comapared to the INA163 chip circuit. Btw do i need 50VA transformer for this mic preamp ? Will a 6VA one do ( I have one lying around)?

19th October 2009, 10:23 AM	#1
Buzzy diyAudio Member Join Date: Apr 2007	DIY mic preamp possible ? Hi ! I have just bought a behringer ECM8000 mic to measure my new DIY speaker. But i just realised that a mic preamp is needed to connect the mic to my pc for making measurements. I am still a student and do not have enough funds for buying a commercial preamp for the mic as i have almost emptied by pockets building the DIY speaker. After searching i found INA163 chip by TI. Is the mic preamp schematic in the datasheet suitable for use with the ECM8000 mic that i have bought ?

19th October 2009, 10:51 AM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	That schematic leaves out the power supply for the chip and the phantom supply, and not being an EE there might be some practical concerns as well. . These are the two typical solutions: rolls mp13 - Google Product Search xenyx 802 - Google Product Search The cheapest way to make a mic and preamp is probably to forget about the ECM-8000 and buy a panasonic capsule and make a Wallin preamp (or look at the one on Elliot Sound pages) You can just use an electret capsule connected to the mic input, but this tends to be quite noisy on most computers. Probably doesn't matter for measuring, though. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

19th October 2009, 11:19 PM	#4
max426 diyAudio Member Join Date: Aug 2008 Location: Pa. USA	Here is an inexpensive mic & preamp you can build System Test jim __________________ "This is DIY. I view op amps the same way I look at a can of soup or a fast-food burger" NP

20th October 2009, 12:16 AM	#6
scott wurcer diyAudio Member Join Date: Jan 2004 Location: cambridge ma	Why not support one of our advertisers? Seventh Circle Audio has an entry level ($79) kit that is based on a great circuit. You could not put the bag of parts together for that. No commercial interest, goes without saying. __________________ 2012, our time is running out.

20th October 2009, 09:30 AM	#9
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Very nice Fotios! __________________ bonsai http://www.hifisonix.com/


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th October 2009, 10:51 PM	#3
Buzzy diyAudio Member Join Date: Apr 2007	Can any mod help me move this thread to analog line level section ? Thank you.

19th October 2009, 11:52 PM	#5
Minion diyAudio Member Join Date: May 2006	You can also buy one of those cheap art or behringer preamps for like $30 ....

20th October 2009, 11:20 AM	#10
Buzzy diyAudio Member Join Date: Apr 2007	Wow Fotios You are a genius. Thanks. This circuit has so many components comapared to the INA163 chip circuit. Btw do i need 50VA transformer for this mic preamp ? Will a 6VA one do ( I have one lying around)?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Tube Preamp Popping on Source Input Change (?) / 6DJ8 Preamp On Chip Amps	MartyM	Tubes / Valves	3	16th October 2008 04:52 AM
Guitar Preamp = MIC Preamp = other preamp ,,are they all same?	Paswa	Solid State	1	12th March 2008 05:16 PM
twisted pear Preamp/other suggestions for Preamp kit	LukeDuke	Chip Amps	1	1st February 2008 09:57 PM
Electret mic preamp - will phono preamp work?	darthmullet	Analogue Source	6	12th October 2007 07:32 AM
wiring preamp outs on a preamp	bonsai171	Solid State	4	22nd March 2004 10:13 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read