Pre amp or Buffer for Inverted GC?

5150ed · 11th July 2006, 10:24 AM

Can anyone suggest schematic of preamp or buffer with gain more than 10X and matched with inverted GC?

Nuuk · 11th July 2006, 03:19 PM

Here is a simple opamp buffer with a gain of 11.

or at least it would be if the file would upload!

5150ed · 11th July 2006, 05:25 PM

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?

Nuuk · 11th July 2006, 05:30 PM

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.

5150ed · 11th July 2006, 05:46 PM

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?

Nuuk · 11th July 2006, 05:49 PM

A suitable PSU is shown on Decibel Dungeon. See the DD Project pre-amp and the GC buffer and pre-amp pages.

5150ed · 11th July 2006, 05:54 PM

Hmmmm..... Can I use OPA627AP or AD797AN instate of DRV134PA???

Christer · 11th July 2006, 06:08 PM

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.

Nuuk · 11th July 2006, 06:08 PM

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.

5150ed · 11th July 2006, 06:27 PM

Thank u Nuuk and Christer.

I shut my mouth for a while

.

11th July 2006, 10:24 AM	#1
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	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?

11th July 2006, 05:30 PM	#4
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

11th July 2006, 05:49 PM	#6
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	A suitable PSU is shown on Decibel Dungeon. See the DD Project pre-amp and the GC buffer and pre-amp pages. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

11th July 2006, 06:08 PM	#9
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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11th July 2006, 05:25 PM	#3
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	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?

11th July 2006, 05:46 PM	#5
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	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?

11th July 2006, 05:54 PM	#7
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	Hmmmm..... Can I use OPA627AP or AD797AN instate of DRV134PA???

11th July 2006, 06:08 PM	#8
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	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.

11th July 2006, 06:27 PM	#10
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	Thank u Nuuk and Christer. I shut my mouth for a while .

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