BJT or FET buffer for CD output - Electronic Circuits Projects Diagrams Free

8899 · 14th October 2006, 03:01 PM

I want to build a buffer (operate at +9Vdc) for CD output, any good suggestion? Thanks!

Hero999 · 14th October 2006, 03:22 PM

Please provide more infromation.

audioguru · 14th October 2006, 05:01 PM

Why does your CD player need an output buffer? An output buffer won't drive a speaker unless it is an audio power amplifier, a completely different animal.

**Nigel Goodwin** · 14th October 2006, 07:53 PM

And your CD plyer already has an output buffer anyway!.

8899 · 15th October 2006, 02:44 AM

Thanks all! I plan to add a buffer after my passive preamp. CD -> Paasive Preamp ->buffer -> power amp -> speaker.

Roff · 15th October 2006, 04:51 AM

A "passive preamp" is a euphemism for a high-quality attenuator. See http://www.dact.com/html/passive_preamp.html.
You don't need a buffer unless you have a long cable between your "passive preamp" (snort!) and your power amp. A simple transistor buffer (BJT or FET) will undoubtedly make your audio quality worse than it was originally (without the "passive preamp" (snort!)). If you need a buffer, it will need to incorporate an op amp.

**Nigel Goodwin** · 15th October 2006, 09:15 AM

Makes you laught doesn't it! - the imaginary improvement of a 'passive preamp' (just a volume control), them adding an active buffer to it - so it's no longer passive!

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14th October 2006, 03:01 PM	#1
8899	BJT or FET buffer for CD output I want to build a buffer (operate at +9Vdc) for CD output, any good suggestion? Thanks! __________________ 8899

14th October 2006, 03:22 PM	#2
Hero999	Please provide more infromation. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

14th October 2006, 05:01 PM	#3
audioguru	Why does your CD player need an output buffer? An output buffer won't drive a speaker unless it is an audio power amplifier, a completely different animal. __________________ Uncle $crooge

14th October 2006, 07:53 PM	#4
Nigel Goodwin	And your CD plyer already has an output buffer anyway!. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

15th October 2006, 02:44 AM	#5
8899	Thanks all! I plan to add a buffer after my passive preamp. CD -> Paasive Preamp ->buffer -> power amp -> speaker. __________________ 8899

15th October 2006, 04:51 AM	#6
Roff	A "passive preamp" is a euphemism for a high-quality attenuator. See http://www.dact.com/html/passive_preamp.html. You don't need a buffer unless you have a long cable between your "passive preamp" (snort!) and your power amp. A simple transistor buffer (BJT or FET) will undoubtedly make your audio quality worse than it was originally (without the "passive preamp" (snort!)). If you need a buffer, it will need to incorporate an op amp. __________________ Ron Last edited by Roff; 15th October 2006 at 04:51 PM.

15th October 2006, 09:15 AM	#7
Nigel Goodwin	Makes you laught doesn't it! - the imaginary improvement of a 'passive preamp' (just a volume control), them adding an active buffer to it - so it's no longer passive! __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk