SSM2019 with unbalanced input - diyAudio
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Old 9th November 2010, 05:16 AM   #1
diyAudio Member
Join Date: Nov 2010
Default SSM2019 with unbalanced input


I've got the question about preamp I found. Thats project:

Click the image to open in full size.

So, How to modify this preamp to reach unbalanced input with +/- 15V supply? Is it possible?

This should work as non inverted preamp.
How to connect -IN of SSM2019?

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File Type: jpg SSM2019 preamp 1.JPG (86.3 KB, 215 views)
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Old 9th November 2010, 06:11 PM   #2
zdavesf is offline zdavesf  Canada
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Join Date: Apr 2006
Location: alberta canada
The schematic you are looking at is really designed for balanced inputs (seen this IC on a lot of microphone preamps). The IC is actually 3 opamps configured as an instrumentation amplifier. To make it work singled ended you can simply ground "A2" input however you will drastically reduce your Common mode rejection and degrade your signal, Not advisable for a design. You can always use an opamp input for your pre. Is there any reason you want to use this circuit?

we all have to start somewhere...
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Old 9th November 2010, 06:53 PM   #3
diyAudio Member
Join Date: Nov 2010
I'll draw & public all my device tonight.
I try to build portable mixer for tv/radio.

OK; but please wait for schematic...
Then we will talk about all my faults
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