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Old 5th November 2004, 02:50 PM   #1
amirmk is offline amirmk  Israel
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Default Basic OPA134 amplifier

Hello,
I got a couple of OPA134 OPamps, and I would like to use them to build a simple amplifier. This is my first DIY project.
Can you please show me schemes I can use?

Thank you very much.
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Old 5th November 2004, 04:54 PM   #2
PMA is offline PMA  Europe
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Old 5th November 2004, 08:54 PM   #3
amirmk is offline amirmk  Israel
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Thank you very much!

I got couple of questions:
1. What is an audio buffer?
2. How can I turn positive to negative voltage? (48V to -/+15V)
3. C6, What does 2u2 stands for?
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Old 5th November 2004, 09:29 PM   #4
00940 is offline 00940  Belgium
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http://headwize.com/projects/showfil...=cmoy2_prj.htm

very basic use of opa134
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Old 5th November 2004, 09:58 PM   #5
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2u2 means 2.2u. put the unit of mesurement where the dot goes. This helps confusion when schematics get photo copied. you can get confused and put a 22u cap in insted.
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Old 5th November 2004, 10:56 PM   #6
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are you intending this for a preamplifier? if yes, use a two stages with opa134 in noninverting topology with gain about 2.1 (1k +1k1), with the potensiometer between them. dont use any caps on the signal, just built a hefty power supply (like 2x4700u + 50 VA / ch + 317/337)... results can be surprising...this is what im using.. really good..dynamics, clarity and huge soundstage (627 lately).. to convert a single supply to dual you could use sth like a buf634 with a voltage divider to generate the 0V potential.. where is the intended 48v from? Using the supply of a power amp isnt adviced, and this will create problems with ground interfacing, too...
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i am currently using 60,000 uF of capacitance in my preamplifier..
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