Audio-Technica AT-PEQ20 Phono Equalizer

Celestial · 27th January 2012, 10:25 AM

Hi,

Can anybody please assist with providing a schematic for the Audio-Technica AT-PEQ20 Phono Equlaizer?

I recently picked up a second hand unit only to find that someone has already tried to mod it and some parts are missing from the PCB and or perhaps not original - two resistors soldered in parallel is a bit of a dead give away?

Thanks

merlin el mago · 27th January 2012, 10:59 AM

If it's like this pic you can compare vs your AT?

mlloyd1 · 11:22 AM

do a search. last year, i posted the schematic and internal pics of the unit that i purchased.

mlloyd1

edit:
OK, I did a search and found I have a different unit. I didn't know AT made more than one. Here's the link to what I have: AT-PEQ3 anyone?
Might be some similarities; maybe not. Good luck!

sreten · 02:56 PM

Hi,

They seem to be similar with the AT-PEQ20 adding discrete transistors
for the MC part, probably the MM parts are very near identical in terms
topology if nothing else.

rgds, sreten.

Celestial · 30th January 2012, 09:29 AM

Hi,

Thanks for your replies. I found the schematic for the AT-PEQ3 from somewhere else and looked carefully at the components used and the number of them.

Putting aside the MC preamp offered by the AT-PEQ20, the straight out MM RIAA stage seems to have a few more components in the feedback loop around the opamp.(The switch appears to switch out the MC preamp from infront of the MM RIAA stage of the AT-PEQ20)

In short the AT-PEQ20 would appear to be a different circuit from the AT-PEQ3?
I read somewhere that the AT-PEQ3 wasn't designed by Audio Technica, instead an out sourced design done by a Hong Kong OEM company that badge the product for Audio Technica.

I've surfed the net for a few days but can't find a macro shot close-up of an AT-PEQ20 such that I could figure out what the resistor and capacitor values are.
Thanks.AT-PEQ3.pdf

Celestial · 30th January 2012, 09:44 AM

Just for interests sake I started looking at some of the Japanese sites, some of those guys are pretty extreme!
This guys has done some interesting mods to his AT-PEQ20 with car battery:
see: ???????? - ??????

Celestial.

27th January 2012, 10:25 AM	#1
Celestial diyAudio Member Join Date: Jul 2010	Audio-Technica AT-PEQ20 Phono Equalizer Hi, Can anybody please assist with providing a schematic for the Audio-Technica AT-PEQ20 Phono Equlaizer? I recently picked up a second hand unit only to find that someone has already tried to mod it and some parts are missing from the PCB and or perhaps not original - two resistors soldered in parallel is a bit of a dead give away? Thanks

27th January 2012, 11:09 AM	#3
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	do a search. last year, i posted the schematic and internal pics of the unit that i purchased. mlloyd1 edit: OK, I did a search and found I have a different unit. I didn't know AT made more than one. Here's the link to what I have: AT-PEQ3 anyone? Might be some similarities; maybe not. Good luck! Last edited by mlloyd1; 27th January 2012 at 11:22 AM.

28th January 2012, 02:51 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, They seem to be similar with the AT-PEQ20 adding discrete transistors for the MC part, probably the MM parts are very near identical in terms topology if nothing else. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow Last edited by sreten; 28th January 2012 at 02:56 PM.

30th January 2012, 09:29 AM	#5
Celestial diyAudio Member Join Date: Jul 2010	AT-PEQ20 vs AT-PEQ3 Hi, Thanks for your replies. I found the schematic for the AT-PEQ3 from somewhere else and looked carefully at the components used and the number of them. Putting aside the MC preamp offered by the AT-PEQ20, the straight out MM RIAA stage seems to have a few more components in the feedback loop around the opamp.(The switch appears to switch out the MC preamp from infront of the MM RIAA stage of the AT-PEQ20) In short the AT-PEQ20 would appear to be a different circuit from the AT-PEQ3? I read somewhere that the AT-PEQ3 wasn't designed by Audio Technica, instead an out sourced design done by a Hong Kong OEM company that badge the product for Audio Technica. I've surfed the net for a few days but can't find a macro shot close-up of an AT-PEQ20 such that I could figure out what the resistor and capacitor values are. Thanks.AT-PEQ3.pdf

30th January 2012, 09:44 AM	#6
Celestial diyAudio Member Join Date: Jul 2010	AT-PEQ20 Just for interests sake I started looking at some of the Japanese sites, some of those guys are pretty extreme! This guys has done some interesting mods to his AT-PEQ20 with car battery: see: ???????? - ?????? Celestial.


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