Pre-Amp for Chip-Amp?

husstown · 6th September 2007, 10:34 PM

I was wanting to start on my first chip-amp project with a dual mono kit from Brian at chipamp.com. I mostly run a turntable, and I was wondering if I first need to run the TT to a pre-amp, then to the mono amps? Or will the monos work well without the pre-amp? If I need a preamp, does anyone have any suggestions for a pre-amp kit or schematic to use with this configuration?

Thanks,

Jason

Nordic · 6th September 2007, 10:48 PM

You need a phonoamp for a TT.. it not only amplifies the very weak output... and also corrects frequency response.

Look at the vsps as an easy phono amp...

panson_hk · 7th September 2007, 06:59 AM

Hi Jason

You need a pre-amp or more specifically a phono amp to amplify and equalize the output of a cartridge. If moving coil (MC) cartridge is employed, you need one more pre-amp! Typically, signal strength along the chain is as follows

Moving magnet (MM) cartridge : 3 mV -> Phono amp: 100 mV -> Pre-amp: 1V -> Power Amp -> Speaker

MC outpus is well under 1 mV. So, a pre-amp, either passive or active, needs to bring the level up to equivalent to that of MM output. Note, equailization (RIAA) is mostly done at phono amp.

Hope this helps.

6th September 2007, 10:34 PM	#1
husstown diyAudio Member Join Date: Sep 2007	Pre-Amp for Chip-Amp? I was wanting to start on my first chip-amp project with a dual mono kit from Brian at chipamp.com. I mostly run a turntable, and I was wondering if I first need to run the TT to a pre-amp, then to the mono amps? Or will the monos work well without the pre-amp? If I need a preamp, does anyone have any suggestions for a pre-amp kit or schematic to use with this configuration? Thanks, Jason

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6th September 2007, 10:48 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	You need a phonoamp for a TT.. it not only amplifies the very weak output... and also corrects frequency response. Look at the vsps as an easy phono amp...

7th September 2007, 06:59 AM	#3
panson_hk :) diyAudio Member Join Date: Aug 2005 Blog Entries: 10	Hi Jason You need a pre-amp or more specifically a phono amp to amplify and equalize the output of a cartridge. If moving coil (MC) cartridge is employed, you need one more pre-amp! Typically, signal strength along the chain is as follows Moving magnet (MM) cartridge : 3 mV -> Phono amp: 100 mV -> Pre-amp: 1V -> Power Amp -> Speaker MC outpus is well under 1 mV. So, a pre-amp, either passive or active, needs to bring the level up to equivalent to that of MM output. Note, equailization (RIAA) is mostly done at phono amp. Hope this helps.

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