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Old 18th June 2012, 09:00 PM   #1
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Default Details on schematic missed, Zap Filter

Hi Folks,

Getting a used ZapFilter MK2 without PSU (Thx again to Mat...), I dont care about the missing Supply PCB and go on to figure out the Pinning of the 10 pole Header.
Further I thought this was no problem, the schematic of the Zap was already online.
But its only the scheme of the Filter itself.
The Shunts are missing, the DC-Servo circuits and, much important at all, the Relay circuit.
Now, after a few measurements, I do have the pinning for the supply for the shuntregulators, the rest is for the relay circuit.

Am I right, the relaycoils are in series to their supply?
And, is the circuit around the relays only for delaying switching?
If it is so, why so complicated with HEF4060 ?
I would like to use the internal Muting-Function of my CDP, how to do this is no problem.
Never the less, Id like to have a complete overview of the hole circuits on the Zapfilter PCB..
Ah, and if anybody has a photograph of the BACK of the PSU PCB, well pls show it...

Regards,

Martin
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Old 18th June 2012, 10:01 PM   #2
UV101 is offline UV101  England
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I've got one not fitted. I'l dig it out and post some photo's
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Old 19th June 2012, 03:32 PM   #3
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Hi,

That would be nice, go for it...

Martin
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Old 20th June 2012, 08:46 PM   #4
UV101 is offline UV101  England
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Here you go, hopefully you can make the circuit out. If you need me to check anything, let me know. it does look fairly straight forward, +/- rails plus an additional rail with low value smoother to run the relays I guess.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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When Bitstream came out, I thought, my God, what are we going to do...? Ken Ishiwata http://www.hifisounds.co.uk
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Old 21st June 2012, 06:22 AM   #5
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Here's what I have left in my archives when I was doing them regularly

The Zap MkI pic has the header pin outs

The mk 2 shows the relays only on the outputs and I included the dc servos.

Cheers George
Attached Images
File Type: jpg Zapfilter MkI.jpg (149.5 KB, 99 views)
File Type: jpg Zap Mk II with dc servo.jpg (103.6 KB, 97 views)
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Old 21st June 2012, 05:28 PM   #6
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Hi,

Thanx to both of you !

@georgehifi:

A little bit too tiny to have a clear look at it( ZapFilter MK I )...

Never the less, this was helpful.
Thank You Guys !

Martin
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