Kenwood DP7090 and ZAPfilter Mk2 connection

Has · 26th July 2005, 04:46 PM

Hi
Hi
I want to buy the ZAPfilter Mk2 so please can you help me with connection. Kenwood have 4x PCM1702 so i think this is schematics, where IC12,IC14,IC16 and IC18 are PCM1702 for one channel. So how i connect ZAPfilter Mk2. I presume that IC12 and IC16 connect together and connect to - (or +) input at the ZAP and IC14, IC18 to + (or-) input ZAP and remove all from C202,C200,C198 and C196. Please help, here it is schematics

Gasho · 26th July 2005, 05:08 PM

Did you send this question to LC-audio ?

Vidim da crv radi , makar uređuješ stan

Bernhard · 26th July 2005, 06:15 PM

Is ZAP a filter or I/V ?

If it is a filter, remove IC 24 and connect - ZAP input to to pin 2 of IC24 and + ZAP to pin 3 of ZAP.

If it is I/V connect Iout of IC12/16 to - in and Iout IC 14/18 to + in.

remove caps on Iout.

IMHO.

Has · 27th July 2005, 03:58 AM

I think that ZAP is I/V.

Gasho · 27th July 2005, 05:31 AM

It have transistor type I/V , LP filter and gain/buffer stage.

All in one, for your player

Extreme_Boky · 29th July 2005, 04:42 AM

From the circuit diagram you provided, it appears that Kenwood decided to use parallel differential configuration for each channel. So, we have2 X (2 parallel 1702) in differential configuration: (IC12 + IC16) and (IC14 + IC18) in dif. mode.

The only way to implement differential inputs of ZAP filter(s) would be to connect them after IC I to V converters – at pins 2 and 3 of IC24.1 which would be pretty bad implementation of ZAP filter.

Anyway, my experience with ZAP filter is not very positive, but you should try this yourself!

The original analog stage is pretty good one! Only two “IC gain” stages. Maybe you should try with Browndog adapters and use 8066 for I to V conversion, and choose between OP275 and AD826 afterwards. If you like warm and mellow, try 2134’s.

Good luck,
Extreme_Boky

Has · 29th July 2005, 11:37 AM

Which part of ZAP filter do you at mind when you wrote that you haven't good experience with it? Why I can't direct connect zap to DAC?

Gasho · 29th July 2005, 01:42 PM

Good question! Why you can´t connect two DAC outputs in paralel?
Becouse it´s te current output ? I dont´n know te reason

.

Has · 29th July 2005, 02:22 PM

Well i will post thrue schematics from service manual.

Extreme_Boky · 30th July 2005, 02:09 AM

Quote:

Well i will post thrue schematics from service manual.

Nice!
Could you please e-mail me the circuit diagram?
nsvircev@idx.com.au

Thanks,
Extreme_Boky

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26th July 2005, 05:08 PM	#2
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	Did you send this question to LC-audio ? Vidim da crv radi , makar uređuješ stan

26th July 2005, 06:15 PM	#3
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Is ZAP a filter or I/V ? If it is a filter, remove IC 24 and connect - ZAP input to to pin 2 of IC24 and + ZAP to pin 3 of ZAP. If it is I/V connect Iout of IC12/16 to - in and Iout IC 14/18 to + in. remove caps on Iout. IMHO.

27th July 2005, 03:58 AM	#4
Has diyAudio Member Join Date: Mar 2003 Location: Zagreb	I think that ZAP is I/V.

27th July 2005, 05:31 AM	#5
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	It have transistor type I/V , LP filter and gain/buffer stage. All in one, for your player

29th July 2005, 04:42 AM	#6
Extreme_Boky diyAudio Member Join Date: Dec 2003 Location: Sydney	From the circuit diagram you provided, it appears that Kenwood decided to use parallel differential configuration for each channel. So, we have2 X (2 parallel 1702) in differential configuration: (IC12 + IC16) and (IC14 + IC18) in dif. mode. The only way to implement differential inputs of ZAP filter(s) would be to connect them after IC I to V converters – at pins 2 and 3 of IC24.1 which would be pretty bad implementation of ZAP filter. Anyway, my experience with ZAP filter is not very positive, but you should try this yourself! The original analog stage is pretty good one! Only two “IC gain” stages. Maybe you should try with Browndog adapters and use 8066 for I to V conversion, and choose between OP275 and AD826 afterwards. If you like warm and mellow, try 2134’s. Good luck, Extreme_Boky

29th July 2005, 11:37 AM	#7
Has diyAudio Member Join Date: Mar 2003 Location: Zagreb	Which part of ZAP filter do you at mind when you wrote that you haven't good experience with it? Why I can't direct connect zap to DAC?

29th July 2005, 01:42 PM	#8
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	Good question! Why you can´t connect two DAC outputs in paralel? Becouse it´s te current output ? I dont´n know te reason .

29th July 2005, 02:22 PM	#9
Has diyAudio Member Join Date: Mar 2003 Location: Zagreb	Well i will post thrue schematics from service manual.

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