Products > Test Equipment
Picotest Injector Teardowns
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16bitanalogue:
Hello All,

I am not sure if this is the best place to start a discussion about PicoTest Line Injectors. They are useful tools, but tend to be on the expensive side. I wanted to upload what I have to be archived, and for those who wish to design their own or at least are interested in such topics. I hope this helps someone, somewhere.

Picotest J2120A Line Injector
Price: $525
BOM:

(4) Capacitors

* C1||C2 = 35.7uF
* C3||C4 = 1.98uF(1) Resistor

* 10k(1) nMOS

* AOT2618 from Alpha and Omega Semiconductor, http://www.aosmd.com/res/data_sheets/AOT2618L.pdf J2120A front and rear pics attached.

Picotest J2130A DC Bias Injector
Price: $525
BOM:

(24) Capacitors

* Parallel, Series network = 27uF(1) Resistor

* 10kI do believe the equivalent network of the 24 caps is 27uF, I may wish to double check when I get a chance.

J2130A front and rear pics attached.

Ridley Injector Isolator Transformer
No specifications really. The manufacturer looks to be Avel Lingberg.
Model CA8518.

I hope this comes out clean, first time poster. Hell of a time with the pics.

*EDIT*
Added front picture of the J2120A.
Sighound36:
Hello 16Bitanalogue

This was going to be a couple of my next purchases much appreciated.

Jay_Diddy_B:
16bitanalogue,

Thank you for the teardown pictures and welcome to the group.


--- Quote from: 16bitanalogue on April 10, 2020, 12:05:00 am ---Hello All,

I am not sure if this is the best place to start a discussion about PicoTest Line Injectors. They are useful tools, but tend to be on the expensive side. I wanted to upload what I have to be archived, and for those who wish to design their own or at least are interested in such topics. I hope this helps someone, somewhere.

Picotest J2120A Line Injector
Price: $525
BOM:

(4) Capacitors

* C1||C2 = 35.7uF
* C3||C4 = 1.98uF(1) Resistor

* 10k(1) nMOS

* AOT2618 from Alpha and Omega Semiconductor, http://www.aosmd.com/res/data_sheets/AOT2618L.pdf J2120A front and rear pics attached.

Snip ...

I hope this comes out clean, first time poster. Hell of a time with the pics.

--- End quote ---

You seem to be missing the J2120A front picture, showing the AOT2618 MOSFET.

Do you have the J2111A Current Injector in your collection? I would like to see teardown pictures.

Thanks!!

Regards,

Jay_Diddy_B
fcb:
Great first post.

The Ridley Injector unit (in blue) is still PatPending (and has been since at least 2010 - no sign of an actual granted patent), looks like it might have a second transformer (3E27 - which is MnZn core material) to handle the HF.

Whilst none of these boxes look like good-value, the BOM cost on the Ridley Injector ($600) unit is much higher than the Picotest ($525+) units.

Ridley videos on YT are pretty interesting.

16bitanalogue:

--- Quote from: Jay_Diddy_B on April 10, 2020, 12:55:42 pm ---
You seem to be missing the J2120A front picture, showing the AOT2618 MOSFET.

Do you have the J2111A Current Injector in your collection? I would like to see teardown pictures.


--- End quote ---

I added the front picture of the J2120A to my first post.

I did manage to capture tear down information for the J2112A High Current Injector which is the big brother of the J2111A. I stashed the penciled schematic, BOM, and pictures somewhere. I will have to see where I squirreled them away, but if not I will have to capture them again.

I realize that most of these have a hell of a markup (engineering effort, mechanical design of the box, etc.), but it is certainly worth a DIY solution.
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