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Old 28th Jan 2022, 3:35 pm   #1
Philips210
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Default 2.5625MHz Crystal

Hi.

I am looking for a 2.5625MHz crystal that's required by the Plessey ZNA134J TV sync pulse generator IC. For reference, the project is one that I've been meaning to build for several years. It is the "Single-Chip Sync Pulse Generator" by Luke Theodossiou from TELEVISION magazine, May 1977.

As an alternative, I considered using a 20.5MHz crystal, available from Farnell, with a divide by 8 counter. I also note that 41MHz crystals seem to be available on eBay so if that crystal could be used then a divide by 16 counter will be needed. This latter option might be tricky due to stability of the clock oscillator prior to feeding the counter. Any suggestions on the feasibility of this would be great.

Over the years, I seem to have collected several ZNA134s but no crystals. If anyone can help with a suitable crystal it will be greatly appreciated, all costs met of course. Thanks.

Regards,
Symon
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Old 28th Jan 2022, 3:57 pm   #2
Pamphonica
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Default Re: 2.5625MHz Crystal

Mouser and Farnell both list them at very reasonable prices. You just need a large enough order of other bits to get the free postage!
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Old 28th Jan 2022, 4:05 pm   #3
Philips210
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Default Re: 2.5625MHz Crystal

Hi Jeremy.

I noticed Mouser stock the 2.5625MHz crystal but not Farnell. Farnell do stock a 20.5MHz crystal though. I have never dealt with Mouser due to the carriage costs.
As you say, it's a case of building up an order to qualify for free carriage. I usually only buy from CPC these days but their stock is limited. Thanks for your reply.

Regards,
Symon
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Old 28th Jan 2022, 4:09 pm   #4
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Default Re: 2.5625MHz Crystal

Sorry, yes, the Farnell reference is just to the datasheet for the ZNA134. Ooops!
Try Vincent Jakomin, possibly? He has found me some very odd frequency crystals in the past. PM me if you don't have his email address (He's UK based).
-Jeremy
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Old 28th Jan 2022, 4:14 pm   #5
Philips210
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Default Re: 2.5625MHz Crystal

Thanks Jeremy.

I'll wait a day or two for any more replies to my request and if no luck I will send you a PM.

Regards,
Symon.
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Old 29th Jan 2022, 10:29 am   #6
G8vsjDave
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Default Re: 2.5625MHz Crystal

Hi Symon, I can't help with a 2.5625MHz crystal, but I do have a few Hitachi HS44007A chips that are a sync pulse generator IC. They use a 17.734 Mhz crystal (4 X pal subcarrier), that seems to be widely available in the Uk. PM me if you would like a chip (no charge). Dave
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Old 29th Jan 2022, 10:37 am   #7
barrymagrec
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Default Re: 2.5625MHz Crystal

I may have a 2.5625Mhz crystal but it will currently be in storage and not easy to access. I should have my new garage / workshop finished in six or so weeks and everything will come out of storage, If you haven`t found one by then PM me.
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Old 29th Jan 2022, 12:41 pm   #8
Philips210
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Default Re: 2.5625MHz Crystal

Quote:
Originally Posted by G8vsjDave View Post
Hi Symon, I can't help with a 2.5625MHz crystal, but I do have a few Hitachi HS44007A chips that are a sync pulse generator IC. They use a 17.734 Mhz crystal (4 X pal subcarrier), that seems to be widely available in the Uk. PM me if you would like a chip (no charge). Dave
Hi Dave.

Thanks very much for the offer of the HS44007A chip it's much appreciated. The sync pulse generator project is actually being built alongside another project, the Colour TV pattern generator from TELEVISION magazine May 1979 which also uses the same ZNA134J IC and 2.5625Mz crystal, so I'm really looking for a couple of the 2.5625MHz XTALs.
If I can't find an XTAL for the SPG, then I'll send you a PM re the Hitachi IC.
Thanks again.

Regards,
Symon
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Old 29th Jan 2022, 12:51 pm   #9
Philips210
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Default Re: 2.5625MHz Crystal

Quote:
Originally Posted by barrymagrec View Post
I may have a 2.5625Mhz crystal but it will currently be in storage and not easy to access. I should have my new garage / workshop finished in six or so weeks and everything will come out of storage, If you haven`t found one by then PM me.
Hi Barry.

That sounds great. I would certainly be interested if you can locate it when you have sorted out your new workshop. I know the upheaval isn't much fun when building a new workshop, shifting equipment and components around trying to fit it into small spaces in the shed/garage and tripping over it in the process.
If I can't locate a crystal in the next couple of months then I'll contact you.

Thanks for replying and the kind offer.

Regards,
Symon
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Old 29th Jan 2022, 6:53 pm   #10
Iontrap
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Default Re: 2.5625MHz Crystal

Hi Symon
I have used these chips a few times.
The Ferranti ZNA134 or the ZNA234 a pattern generator chip.
I have always used 2.5 MHz xtal as per data sheet.
The 234 is a great little chip. It can be built into an old colour tv for a crosshatch source.
I can send data if it helps.

Simon
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Old 29th Jan 2022, 7:05 pm   #11
Philips210
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Default Re: 2.5625MHz Crystal

Hi Simon.

Yes, the ZNA234 is a useful IC. I have used one in a college project quite a few years back and still have it.

As far as I can make out, the ZNA134 SPG IC needs a 2.5625MHz crystal. On the other hand the ZNA234 pattern generator IC does indeed use a 2.5MHz crystal. I actually have the data on both chips but thanks for the kind offer anyway.

Regards,
Symon
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Old 29th Jan 2022, 10:10 pm   #12
Philco-Pete
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Default Re: 2.5625MHz Crystal

Hi Simon
I used the ZNA134 in many projects back in the day and am sure I still have some of these crystals as well as the chips. Not sure if they’re at home or work but will find one for you over the next couple of days. PM with your details and I’ll stick it in the post.
Cheers
Pete
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Old 29th Jan 2022, 10:12 pm   #13
Philco-Pete
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Default Re: 2.5625MHz Crystal

Sorry Symon, please forgive my misspelling of your name on the previous post
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Old 29th Jan 2022, 11:05 pm   #14
Philips210
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Default Re: 2.5625MHz Crystal

Quote:
Originally Posted by Philco-Pete View Post
Hi Simon
I used the ZNA134 in many projects back in the day and am sure I still have some of these crystals as well as the chips. Not sure if they’re at home or work but will find one for you over the next couple of days. PM with your details and I’ll stick it in the post.
Cheers
Pete
Hi Pete.

That's great thanks. PM on the way.

Regards,
Symon
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Old 1st Feb 2022, 4:07 pm   #15
Philips210
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Default Re: 2.5625MHz Crystal

Hi.

Today I received two, very well packed, 2.5625MHz crystals kindly sent by Philco-Pete. I'm most grateful to Pete for sending the XTALs. Excellent result, thanks very much.

Regards,
Symon
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