Details on schematic missed, Zap Filter
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...:)
I've got one not fitted. I'l dig it out and post some photo's :)
That would be nice, go for it...:D:)
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.
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.
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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