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Classic Schematics
06-04-2019, 08:00 AM
Post: #1
Classic Schematics
Hi all,

If anyone is interested, I uploaded some schematics of the classics and HP67 in PDF format. I have left out the logic interconnections as to me they complicate matters, however all connections are marked.

http://www.teenix.org/classSchm.zip

cheers

Tony
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06-04-2019, 09:22 AM
Post: #2
RE: Classic Schematics
Tony,

Thanks a lot for the effort and for making these avaialble!

Cheers,
Harald
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06-04-2019, 10:48 AM
Post: #3
RE: Classic Schematics
Thanks teenix

I love classic schematics!

Bernhard

That's one small step for a man - one giant leap for mankind.
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06-04-2019, 01:14 PM
Post: #4
RE: Classic Schematics
Thank you!

RPN rules!
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06-04-2019, 10:36 PM
Post: #5
RE: Classic Schematics
Thank you!
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06-10-2019, 04:29 PM
Post: #6
RE: Classic Schematics
Hi all,

I added schematics for HP-10 and HP-19C in PDF format to the zip file.

http://www.teenix.org/classSchm.zip

cheers

Tony
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06-10-2019, 11:47 PM
Post: #7
RE: Classic Schematics
Thanks---very useful and readable. On the HP-35 schematic, pins 15 and 17 of the 26-pin header have the same label, C3. One of them should be C4 I guess.
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06-11-2019, 12:38 AM
Post: #8
RE: Classic Schematics
(06-10-2019 11:47 PM)Peter Monta Wrote:  Thanks---very useful and readable. On the HP-35 schematic, pins 15 and 17 of the 26-pin header have the same label, C3. One of them should be C4 I guess.

Thanks Peter,

Fixed. There are probably other bugs there that I missed. I'm sure sometimes when I see an error, my mind totally ignores it for some reason. Maybe my blind spot is bigger than I think.

Recently, and after numerous checks, I put in a new PCB design for the replacement HP-67 CPU board and as soon as I got the message it was completed and on it's way I saw a circuit error :-( Thankfully nothing major.

cheers

Tony
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06-11-2019, 12:51 AM (This post was last modified: 06-11-2019 12:52 AM by Jim Horn.)
Post: #9
RE: Classic Schematics
Thank you for that, Tony!

Just a minor point - the HP67 Charger diode bridge is rotated clockwise 90° compared to the actual circuit (the four diodes should be pointing to the top of the 400µF cap).

Best to you - and thank you for all your research, hard work and delightful postings!
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06-11-2019, 01:24 AM
Post: #10
RE: Classic Schematics
(06-11-2019 12:51 AM)Jim Horn Wrote:  Thank you for that, Tony!

Just a minor point - the HP67 Charger diode bridge is rotated clockwise 90° compared to the actual circuit (the four diodes should be pointing to the top of the 400µF cap).

Best to you - and thank you for all your research, hard work and delightful postings!

Thanks Jim, (all Classics too) Fixed :-)

I put the charger on its own sheet.

cheers

Tony
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06-13-2019, 07:26 AM
Post: #11
RE: Classic Schematics
Impressive! Congrats!
Thanks for sharing!

Kind regards

Ignacio
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06-17-2019, 03:34 AM
Post: #12
RE: Classic Schematics
(06-10-2019 04:29 PM)teenix Wrote:  Hi all,

I added schematics for HP-10 and HP-19C in PDF format to the zip file.

http://www.teenix.org/classSchm.zip

cheers

Tony
Thanks for the update! minor point: both the HP-10 and HP-19c are labeled HP-10.
-kby
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06-17-2019, 05:42 AM
Post: #13
RE: Classic Schematics
(06-17-2019 03:34 AM)[kby] Wrote:  Thanks for the update! minor point: both the HP-10 and HP-19c are labeled HP-10.
-kby

All Fixed :-)

cheers

Tony
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06-17-2019, 11:47 PM
Post: #14
RE: Classic Schematics
Many thanks for those helpfull schematics!
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