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Old 19th March 2014, 06:08 PM   #20201
6h5c is offline 6h5c  Netherlands
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Hi Tom,

That took you some time :-)

A Kwak-clock requires a symmetrical power supply, and the only supply in the CD67 you could use for it is the analog supply. Not really recommended, because you will pollute the analog output section with noise from the Kwak-clock. If you'd like to test it and see if it works, you could use the voltage from C803 and C804. There's about +/- 21V there.

The best solution is to use an external supply for the clock. A small transformer with two secondaries, a bridge rectifier and two capacitors are all you need. If you want to go fancy you could even use a 7812/7912 combo to do some pre-regulation and feed the Kwak with a nice stable voltage.

I've had the same problem in the past, and I didn't want to use a dual supply voltage for a simple clock. So I decided to modify the Kwak 7 a bit and make it work on a single-ended supply. You can find the result here on my CD clock page.

Regards,

Ray
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Old 20th March 2014, 12:03 AM   #20202
dwjames is offline dwjames  England
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I finally diagnosed my intermittent problem with my display dying and the disc spinning either backwards or very fast clockwise this evening. Seems the 5v regulator I built for the decoder has a loose joint somewhere cos I can apply pressure to it in a certain direction and everything springs back into life. Very happy to have worked that one out!
Now I just need to fix it.
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Old 20th March 2014, 07:55 AM   #20203
6h5c is offline 6h5c  Netherlands
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That's a nasty one, these things are difficult to track down. Good news you found it!
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Old 21st March 2014, 08:59 AM   #20204
matski is offline matski  United Kingdom
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Thanks Ray however my clock didn't work, according to Kwaks instructions I should set pin 3 of comparator using pot to +0.5v to +0.6v however I could only get -4.5v to -13v (I didn't connect output to xtal/digi processor circuit just in case the pin 3 voltage had to eb set first- would this connected change the value of pin 3?)

Tom (Honda Z50M)
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Old 21st March 2014, 11:34 AM   #20205
6h5c is offline 6h5c  Netherlands
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Looks like the positive power supply is missing at the pot, i'd check the voltage at the pins.
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Old 21st March 2014, 11:51 AM   #20206
matski is offline matski  United Kingdom
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Thanks Ray, will visually check circuit also going to make a separate Power supply for it so I can test it out of the CD player (assuming I don't need to connect the clock signal to CD player if you could confirm??) then fit in player with PSU.

Tom
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Old 21st March 2014, 12:42 PM   #20207
6h5c is offline 6h5c  Netherlands
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Hi Tom,

No, the output of the clock doesn't have to be connected to test it.
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Old 21st March 2014, 12:51 PM   #20208
matski is offline matski  United Kingdom
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Thanks Ray, will update as soon as done.

Tom (Honda Z50M)
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Old 21st March 2014, 01:59 PM   #20209
6h5c is offline 6h5c  Netherlands
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Ok!
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Old 25th March 2014, 09:18 AM   #20210
matski is offline matski  United Kingdom
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Ray, I have made a +/-5v supply and amended the clock circuit (hopefully it should be attached below)

If you could cast your eye over it and let me know if this will be ok with regards to noise etc (I get +0.5v now on pin 3) I'll rebuild the clock and try again.

Also using the +/- 19V from the Elna's is that going to induce noise and is it of an acceptable level (will the added benefit of the clock out way the additinal noise?)

[IMG]G:\USERS\Tom\Toms-KWAK-CLOCK-7.gif[/IMG]


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