Jump to content
Electronics-Lab.com Community
Sign in to follow this  
vivek_pv

Microphone Amplifier

Recommended Posts

Look at XLR Connector in Google. It shows the balanced signal pins and the ground pin of your microphone. Shure's datasheet for your microphone also shows which pin is which.

Most of the "horrible" schematics of preamps with only two wires for the mic are for cheap toys. Your Shure professional microphone is not used in toys, it is balanced.

Share this post


Link to post
Share on other sites

I got some information on XLR pin mics.

I think there is one "Normal polarity" and another "inverted Polarity"

Should I use these like: normal to "non-inverting" and inverted to "inverting" ends of an OP amp?

Regards,
V

Share this post


Link to post
Share on other sites

You cannot connect anything directly to both inputs of an opamp because the voltage gain would be 200,000 at low frequencies which is way too high. The opamp needs to have negative feedback to reduce the gain to a usable amount. The inputs of an opamp also need to be biased correctly.

Look in Google for Opamp Differential Input Pre-amplifier Circuit that has two inputs for a balanced microphone.

Share this post


Link to post
Share on other sites

Vivek,
The Shure SM58 provides a positive signal on pin 2 with respect to pin 3 when pressure is put on the diaphragm (when sound hits it). Pin 1 is connected to ground. To connect this microphone to an unbalanced mixer, you just connect pins 3 and 1 to ground and use pin 2 as your signal output. This is all you have when you purchase a cable with XLR on one end and 1/4" phono jack on the other end.
You will not see any difference in the output unless you are running massive lengths of microphone cables.

MP

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...