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Old 15th September 2003, 11:40 AM   #1
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Default Searching for ZAPfilter Mk2 clone.

Is anybody interested in making a ZAPfilter Mk2 clone?
Or has anybody made it DIY?
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Old 23rd September 2003, 02:09 AM   #2
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Well after a few days work and searching around I came up with the following circuit. This is the "Zap Filter MK2 clone" test circuit. It has only been used as simulation. I used normal europian transistors. If anybody has any ideas please share.

I will post here the schematic and a few graphs.
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Old 23rd September 2003, 02:54 AM   #3
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this is in text
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File Type: jpg zap filtermk2 clone copy.jpg (54.7 KB, 1989 views)
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Old 23rd September 2003, 03:00 AM   #4
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I also got a copy in pdf. I know the quality is not so good but the schematic is too large to post it in the forum. If someone wants a better copy I can send it per email.
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File Type: zip zapfiltermk2.zip (68.9 KB, 434 views)
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Old 23rd September 2003, 03:10 AM   #5
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This is the balanced output from single ended current input of 2mA peak to peak.
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File Type: jpg output waveforms.jpg (86.1 KB, 1306 views)
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Old 23rd September 2003, 03:14 AM   #6
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One last graph for tonight. This is the frequency range measured at the output.
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File Type: jpg frequency range on output.jpg (35.5 KB, 1274 views)
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Old 23rd September 2003, 10:56 AM   #7
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I forgot to say that the you canīt see the input connections like on the original board where you have to make small solderings. I have tried it with voltage input and it works fine.
This version has the bases to a voltage and there is one current input. The negative current input is left in the air with no connection. The input pair is driven as common base, without the 2 DC offset tracking op amps you get a lot of DC at the output.
I will post a graphic of the outputs without DC servo circuits. In this case you need capacitors at the outputs.

Also you get an unbalance and you have to trim the emitor resistors of Q5 and Q6 to get the 2 signals at the same level. I think this happens because there is only one signal at the inputs.
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Old 1st April 2004, 10:46 AM   #8
Kari is offline Kari  Sweden
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Hi,
how did your "reallife" test go? Also did you make a pcb for this? I'm very interested in this because i'm not villing to pay 200EUR for the board and also this would be a "semi" diy projekt. I'm going to build Doedes no DAC and i need balanced out from that, so this would be the perfect thing.

Thx,

Kari
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Old 31st January 2008, 08:34 PM   #9
cbriere is offline cbriere  Canada
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is your circuit working?
i need to build such a circuit and want to know if you got good results?

my thread is here:
http://www.diyaudio.com/forums/showt...63#post1415963


Cbriere
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Old 30th April 2009, 10:16 PM   #10
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Promitheus Hi, I know in your sim you had 1mA feeding the input,
but how much higher than 1mA can you go before one of the stages starts to clip?

Cheers George
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