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Old 11th July 2006, 10:24 AM   #1
5150ed is offline 5150ed  Thailand
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Default Pre amp or Buffer for Inverted GC?

Can anyone suggest schematic of preamp or buffer with gain more than 10X and matched with inverted GC?
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Old 11th July 2006, 03:19 PM   #2
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Here is a simple opamp buffer with a gain of 11.

or at least it would be if the file would upload!
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File Type: gif opamp circuit.gif (3.9 KB, 360 views)
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Old 11th July 2006, 05:25 PM   #3
5150ed is offline 5150ed  Thailand
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Ho thank u so much Nuuk.

Can you tell me which chip # is used in this schematic ?

Is the step place before or after the buffer? Can I use my 100K step?
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Old 11th July 2006, 05:30 PM   #4
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Depends if you use single or dual opamps. I suggest goig for singles. Try OPA134 to start with.

Put your buffer after your 100K pot.
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Old 11th July 2006, 05:46 PM   #5
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100K Pot .

555 I can save big bug now.

Anyway, what should be the +- voltage for this opamp??? and how can I design the PSU of it?
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Old 11th July 2006, 05:49 PM   #6
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A suitable PSU is shown on Decibel Dungeon. See the DD Project pre-amp and the GC buffer and pre-amp pages.
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Old 11th July 2006, 05:54 PM   #7
5150ed is offline 5150ed  Thailand
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Hmmmm..... Can I use OPA627AP or AD797AN instate of DRV134PA???
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Old 11th July 2006, 06:08 PM   #8
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You should use your pot/attenautor instead of the 51 k resistor in the schematic. You don't want that resistor to load down the pot.

AD797 is probably a bad idea for line level circuits. It is specially designed for low-level low-noise applications, and has some internal design choices that might not be so good for high input levels.
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Old 11th July 2006, 06:08 PM   #9
Nuuk is offline Nuuk  United Kingdom
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Who mentioned DRV134PA?

What you need to do is RESEARCH! There is a lot of information available and a lot to learn. You can't build good hi-fi just by asking questions - it isn't that easy!

Look at datasheets. You can find out what voltages are involved. Look at other people's circuits and see what they use. Get something simple up and running frst - then start to tweak with exotic components.
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Old 11th July 2006, 06:27 PM   #10
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Thank u Nuuk and Christer.

I shut my mouth for a while .
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