The Elektor Forum will close. See also this link. From Friday March 1st it is no longer possible to log in to the forum. However, the content of the forum will remain visible until the end of March. As of April 1st the forum will definitely go off the air.

microphone power amplifier?

HiFi, LoFi, Tubes, Transistors, ICs, Commercial, DIY

microphone power amplifier?

Postby smh69 » Sun Aug 13, 2017 3:01 pm

would like to feed a non powered microphone (like pc headset type) into a mixer over a cd playing.

do i need a pre amp and low power amplifier?

I have built a pre amp and a TDA amplifier but the heatsink i put on the amplifier gets so hot and after a while distorts because its too hot.

Anyone see on a cheap build website like this a https://www.icrfq.com/products/ more suitable device?
Last edited by smh69 on Thu Aug 17, 2017 3:40 pm, edited 1 time in total.
smh69
 
Posts: 2
Joined: Sun Aug 13, 2017 2:52 pm

Re: microphone power amplifier?

Postby smh69 » Tue Aug 15, 2017 1:40 pm

any help
smh69
 
Posts: 2
Joined: Sun Aug 13, 2017 2:52 pm

Re: microphone power amplifier?

Postby SteveMJ » Tue Jun 26, 2018 7:35 pm

It would help if your question was clearer. What is the input to the mixer from the microphone? Is the mixer input specified to suit the microphone levels or from an amplified signal?

An amplifier will not cause distortion due to excess heat. The excess heat may cause some components to malfunction and these may introduce distortion.
SteveMJ
 
Posts: 11
Joined: Tue Feb 13, 2018 11:38 am

Re: microphone power amplifier?

Postby Deo » Thu Nov 01, 2018 7:09 am

cheap build website may not high quality.

You can view:
[url]win-source.net[/url]
http://www.allchips.ai
[url]utsource.net[/url]


if you want to build, you can go to [url]elcircuit.com[/url] his website almost about power amplifier.
Deo
 
Posts: 2
Joined: Thu Nov 01, 2018 6:15 am

Re: microphone power amplifier?

Postby StickiWik » Wed Nov 28, 2018 10:43 pm

I was under the assumption that electret microphone capsules do not require any phantom power an can be connected in the same way dynamic microphone capsules can be, due to the fact that they contain a small permanent static charge built in. I am trying to build a really simple mic to hook up to my computer via the 3.5mm mic jack, and after wiring everything up, it doesn't seem to be working. Is this because there is in fact supposed to be some sort of phantom power circuit, or should I just double and triple check my wiring again?
User avatar
StickiWik
 
Posts: 8
Joined: Thu Dec 14, 2017 1:17 pm

Re: microphone power amplifier?

Postby JtH » Wed Dec 12, 2018 11:47 pm

smh69 wrote:would like to feed a non powered microphone (like pc headset type) into a mixer over a cd playing.

do i need a pre amp and low power amplifier?

I have built a pre amp and a TDA amplifier but the heatsink i put on the amplifier gets so hot and after a while distorts because its too hot.

Anyone see on a cheap build website like this a https://www.icrfq.com/products/ more suitable device?



Hi.

Supposing you use a microphone pre amp and a TFA power Amp:

Having no other signal input to the TDA-Amp, but just the pre-amp connected and the TDA-hestsink hot: This might be oscilllation of the pre-amp
and requesting high current draw into the TDA:
1. checkt the correct power/voltage to the TDA and the pre amp as well.
2. The pre amp can be checked simularly. Check amplifying factor by an input signal of 2-10mV (or microphone) and check
for AC output signal with a digital MM. Or, just put yr finger tip to the hot input.
3. Check the TDA :-with shortened singnal input- and correct pwr supply?:
Still heating >> alsmost certainly DEFECT, due to HF or too high input signal(s) Check the specs, print board and replace
Ambient temp or little more: Connect to (a) speaker(s) you must not hear any 'hiss'-sound:? Might be still correct TDA
Try to connect to a sound source at low volume level.
4. If the TDA seems correct you might gif it an input signal from e.g. the head phone jack of some radio/old mobile phone.
Doing so, you check for distorsion parallel to increasing volume.

Several good pre amps are for sale online.
Often you do need just a handfull of external parts. But... all depents on the source and your requirements.
Best way however for both amps; use a scoop and a tone generator or an -injector.

>> if you have any questions, always give detailed info, such as TDA....., pre-amp, based on... power supply V/A ... microphone..... <<

Maybe you find a proper solution at the site in my footer, otherwise here:
- https://nl.mouser.com/search/refine.aspx?N=11227392
- https://www.reichelt.de/ICs-TA-TSA-/2/i ... OUPID=2916
- https://www.alibaba.com/product-detail/ ... 38d29DZ9GA

Good Luck!
R U interested in looking up very old stuff from Elektuur Elektor and more and e.g. dl those magazines in pdf?
https://archive.org/search.php?query=elektuur

( Uploads allowed too )
JtH
 
Posts: 2
Joined: Wed Dec 12, 2018 9:49 pm
Location: Nederland


Return to Audio & Video

Who is online

Users browsing this forum: No registered users and 1 guest