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Random Task 18th June 2012 09:00 PM

Details on schematic missed, Zap Filter
Hi Folks,

Getting a used ZapFilter MK2 without PSU (Thx again to Mat...), I donīt 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 itīs 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, Iīd 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...:)



UV101 18th June 2012 10:01 PM

I've got one not fitted. I'l dig it out and post some photo's :)

Random Task 19th June 2012 03:32 PM


That would be nice, go for it...:D:)


UV101 20th June 2012 08:46 PM

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.

georgehifi 21st June 2012 06:22 AM

2 Attachment(s)
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

Random Task 21st June 2012 05:28 PM


Thanx to both of you ! :)


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

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


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