WTB: OPT001 Board for HP/Agilent 33120A

[ZGoode]

I am looking to buy the option board for an HP/Agilent 33120A function generator.  I can't seem to find anywhere online, so if anyone has one, or even a broken 33120A that they can pull it from I'd be interested in buying it.
I was looking into making a replacement board, but I can't seem to find a suitable replacement for the oscillator used on the board since I can't even find a datasheet for the original one used.

[Zucca]

I am 99% sure your read this, but just in case
https://www.eevblog.com/forum/testgear/agilent-33120a-option-001-phase-lock-external-10mhz-standard/

Posting the schematics somewhere in this forum and asking for help nicely could push you in the right direction to make it one yourself.

[indeterminate]

Theirs a dead 33120a with option 001 on flebay now
115710775753

[Qw3rtzuiop]

I cloned the option board. If DIY is an option for you. Details are available here:
https://github.com/Qw3rtzuiop/33120a-option-001

[ZGoode]

Theirs a dead 33120a with option 001 on flebay now
115710775753

I mean thats pretty much what I'm looking for, but they want pretty much the price of a working unit and its freight shipping

I cloned the option board. If DIY is an option for you. Details are available here:
https://github.com/Qw3rtzuiop/33120a-option-001

Probably going to look more into this since I'm not against spinning my own.  I was looking to make a 1:1 copy of the original board, but can't source the crystal they used.  Literally every other part is something that can still be bought on Digikey except for that stupid miscellaneous 40MHz crystal.  Qw3rtzuiop, I'm assuming that's why your version uses a 10MHz OCXO instead of the original 40MHz?

[ZGoode]

I am 99% sure your read this, but just in case
https://www.eevblog.com/forum/testgear/agilent-33120a-option-001-phase-lock-external-10mhz-standard/

Posting the schematics somewhere in this forum and asking for help nicely could push you in the right direction to make it one yourself.

Yup, I did see that one.  Once I look a bit more into Qw3rtzuiop's design I'll probably start a post for that

[Qw3rtzuiop]

Qw3rtzuiop, I'm assuming that's why your version uses a 10MHz OCXO instead of the original 40MHz?

Yes. I wasn't able to source a 40 MHz oscillator for a reasonable price. And these used OCXOs are cheap.

[ZGoode]

What's the difference between your version 0 and version 1?  Or is it just adding on the changes from those bodge wires you mentioned?  I'm debating whether or not to deep dive this, or just order and assemble your design and call it a day since I want this option, but I have other projects I would rather work on

[Finnegan1]

Zgoode - I sent you a PM on how to source built and tested units.

[Qw3rtzuiop]

What's the difference between your version 0 and version 1?  Or is it just adding on the changes from those bodge wires you mentioned? 

Yes. Rev. 1 contains the bodges I had to make on rev. 0

[Qw3rtzuiop]

Zgoode - I sent you a PM on how to source built and tested units.

Why not posting it here for others to see too?

[ZGoode]

Zgoode - I sent you a PM on how to source built and tested units.

Why not posting it here for others to see too?

He just told me to buy the SCSKits board on Ebay, which while that seems like an ok solution, I don't know what quality of components are used and how it compares to the original.  At least with spinning my own from the github you provided, I can select high quality components and know how the specifications stack up to the original option.

[ZGoode]

Hey Qw3rtzuiop,
Do you happen to remember the part numbers of the CR108 and T101 for your version?  Those are the only parts I have not been able to make sure I have the right version for yet.  Also how long did you make the IDC ribbon cable?  I was planning on ordering a premade one off digikey and wanted to make sure I had one at least the minimum length

[Qw3rtzuiop]

Hey Qw3rtzuiop,
Do you happen to remember the part numbers of the CR108 and T101 for your version?  Those are the only parts I have not been able to make sure I have the right version for yet.  Also how long did you make the IDC ribbon cable?  I was planning on ordering a premade one off digikey and wanted to make sure I had one at least the minimum length

CR108 is a SMCJ43CA in the original schematics. I used an 18CA that was in my parts box. T101 is TC1-1T+ from Mini Circuits. In my case its useless at the moment because i didnt use isolated bnc jacks. Th cable length is 15cm but its almost too long.

[ZGoode]

Awesome!  I thought that was the transformer used, but wanted to make 100% certain.  I plan on using isolated BNC's if I can find some for RG316 so that will be useful for me.  As soon as I get all the parts and boards I'll assemble one and let you know how it goes!

[Qw3rtzuiop]

If you find isolated bncs for RG 316 please link them here.

[ZGoode]

If you find isolated bncs for RG 316 please link them here.

These here on Digikey are the ones I was looking at using:  https://www.digikey.com/en/products/detail/amphenol-rf/112252/2627853