Looking for Heathkit AD-1702 Xover schematic - diyAudio
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Old 26th December 2007, 04:40 PM   #1
PierreG is offline PierreG  Canada
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Default Looking for Heathkit AD-1702 Xover schematic

I'm looking for Heathkit AD-1702 Xover schematic.
But if you have another variable crossover schematic, it can be usefull also.
Thanks in advance
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Old 26th December 2007, 07:35 PM   #2
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Default AD 1702 Schematic

I want one too , manual included would be nice too.
I f someone would go to their Staples or Office Depot , etc, with their schematic and get it copied FULL size , they can do 24 by 36 in copies , and mail it in a mailing tube I would be glad to pay costs and mailing.
A copy of the manual would be nice too.
Ed
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Old 28th December 2007, 03:37 PM   #3
PierreG is offline PierreG  Canada
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I think a PDF or a jpg would be enough.
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Old 27th October 2008, 08:28 PM   #4
PierreG is offline PierreG  Canada
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Somebody?
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Old 27th October 2008, 10:12 PM   #5
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http://delta-audio.com/Active%20filter%20two.htm is an option. You could substitute sockets for ressistors or even multiturn pots. More flexible than the ganged filter tuning of the Heathkit.

A friend gave me an AD-1702. It still has the original caps. The heaviest single rack piece of equipment I've ever seen, but the high pass section really sounded fuzzy to me.
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Old 28th October 2008, 01:49 AM   #6
PierreG is offline PierreG  Canada
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Thanks Bob. Good idea, but i'm still curious about the AD-1702.
If someday you don't need it anymore....
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Old 29th October 2008, 07:31 PM   #7
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Default AD 1702 and AD 1701 schematics

Hi:
Won't someone who has the AD 1701 output indicator and the AD 1702 crossover go to their local Office Depot and get full size copies of the schematic ? They CAN do this.
Please send them to me in a mailing tube and I will be happy to cover the costs. I have some copies made of the AP 1800 preamp and the AA 1600 power amp for trade. These copies only cost me about $1.50 each.
Thank You
Edward Lipman
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Old 18th November 2008, 06:09 PM   #8
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Default I found mine!

I have both the unit (that I built as a kid) and the full original manual.

its about 100 pages...

if there are specifics you want, I'll scan those pages. else, its going to take some time to scan this whole thing in...
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Old 18th November 2008, 06:28 PM   #9
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Default AD 1702

Linux :
If you would go to the Office Depot store with the schematics they can make full size copies of both of them. I would like the full size sch. instead of a scan.
I would like the scan of the manuals and the assembly drawings too.
Thank You
Edward Lipman

Please PM me if there are any questions and my address. I will be glad to pay for the copies. The last time I had copies done it was about $1.50 for each copy.
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Old 18th November 2008, 10:05 PM   #10
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I can photograph the whole schematic, as a whole. you can then zoom around it and see the section you want. my photos are usually pretty sharp so the single photo should probably do it for you, I guess. I'll post a reply here with the link when I have it ready.

as for copying the whole book, I can ask if they'll do it but I've heard a LOT of stories about photocopy places refusing to copy whole works unless you are the author. they even refuse to copy or print things that you, yourself, own - if the thing 'looks too professional'. (I've heard the same about photo stores that won't print a photo unless you sign a statement saying you are the original artist). its insane, isn't it? but it seems quite common for copy shops to refuse jobs.

I don't mind photo'ing or scanning in some more sections. assuming we can't get a full copy of the book, what would you like and in what order of prec?

btw, I have my crossover and I'm about to power it up for the first time in maybe 10 yrs. I'm thinking of upgrading all the electro's (should I?) and also getting newer op amps for the ones that matter (all the ones other than the quad comparitor which is just some led indicator threshold thing and not in the signal path).

I also wonder if its worth upgrading the E transformer with a toroid?
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