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HP PN 1855-0418 Part Identification Help

 

Hello,

I need to replace a dual monolithic N-FET transistor on HP 8903B, the HP code for the part is 1855-0418. Can anyone help identify this part so I can source a replacement?

Thank you!

Regards,
Bernardo.
--

Advice for a new to me Spectrum Analyzer

 

I have a new to me HP 4411B spectrum analyzer and I am wondering about options and software for the unit. It is currently fully working and no faults are detected with it so that is good. It does have the tracking generator with it so that was the big think I was looking for but I was also wondering about what options could be added to it now. or is ti set in stone for options?

Eric
Re: How to fix broken HP key

 

¿ªÔÆÌåÓý

Shapeways can

?

From: [email protected] <[email protected]> On Behalf Of Robert G8RPI via groups.io
Sent: 02 June 2021 18:14
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] How to fix broken HP key

?

Most people can't 3d print metal :-)

Calvin,
If no one in the USA can give you one, I can put a contact in the post if you PM me your address.

Robert G8RPI (Cambridge UK)

Re: How to fix broken HP key

 

Most people can't 3d print metal :-)

Calvin,
If no one in the USA can give you one, I can put a contact in the post if you PM me your address.

Robert G8RPI (Cambridge UK)
Re: General opinion on 180 series scopes?

 

Currently eBay is showing 1804a 4 channel plugins for around $20-50. The 1804 does 4 channels but no math. The 2 channel units have addition and the specs say when one Chanel is inverted it acts like a differential input instrument! The 1821 dual time base is spectacular. It can be set up to have a variable width time delayed window within the display which is higher intensity on the screen and thus can magnify a signal within the signal. Also, a trigger can be set within that segment and a separate external trigger can be use for the main and the delayed segment. This gets you behavior like on a digital storage scope. Imaging the ability to trigger on certain glitches during the delay time. I used to use it to pluck out separate scan lines in an NTSC composite signal. Set up a separate circuit to count pulses in the signal and feed the counter output into the secondary trigger and you could pick the scan line. This is very flexible triggering. ?Fun to use scope. I just picked up a 4 channel plug in and now have a 4 channel analog scope. ?Screen display is rock solid when you get the trigger set up. The scope is intuitive to use. Schematics available. I think it is a great beginner scope if working. It is easy to repair with all discreet components. It has a cool feature of a signal delay line so you can see a bit of the signal before the trigger fires.
Re: How to fix broken HP key

 

Has anyone tried 3D printing those switches?
Re: Free CRT

 

John,

I sent you a PM. Check your spam.

Wally KC8INK
Re: How to fix broken HP key

 

On Tue, Jun 1, 2021 at 08:59 PM, Daun Yeagley wrote:
Those look like Bill West switches to me.? They are very common in HP gear, particularly of the 70's and 80's vintage.? There was just a thread on here about them just in the last week or so. You should be able to salvage parts from an instrument keyboard of that vintage.? Where are you?
In case you go looking for a key switch parts donor, a (broken) HP 3437A would be a very good (and undervalued) candidate. They are offered regularly at acceptable prices and the Bill West keys in them are not heat-staked to the PCB but only held by a screw-attached bracket, so very convenient for use as replacement parts.

Raymond
Re: How to fix broken HP key

 

Before you go gluing stuff together, let me tell you, do NOT use glue.
Figure out what plastic is being used, and use a PLASTIC WELDING
COMPOUND. It consists of a solvent (which quickly evaporates) that
softens the plastic, possibly some plastic stock dissolved in it, and
some surface preparation chemicals. Every plastic has a different
plastic welding compound. In the end you're working with something
that has the consistency of putty. If you get those tiny metal
spatulas, like used for ceramics and pottery, they are perfect for
shaping that stuff. You can easily rebuild the missing plastic part
this way. You can also get a piece of the same plastic that's the same
shape as the missing "finger", and use that as part of the
reconstruction.

On Tue, Jun 1, 2021 at 9:29 PM Calvin Guan via groups.io
<guancalvin@...> wrote:

Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file? Is there a decoder in Win 10 pro?



--jeff
Re: How to fix broken HP key

Sandra Carroll
 

You can go to settings/camera/format and change to compatible and it will save in jpg/h264 format instead except for things like 60fps video. Details are there in the settings.

Sandra

Sent from my iPhone 7 Plus

On Jun 1, 2021, at 9:59 PM, Bryce Schroeder <bryce.schroeder@...> wrote:

?The GNU Image Manipulation Program (GIMP) also supports HEIF/HEIC in
recent versions.

On Tue, 1 Jun 2021 at 17:50, Daun Yeagley <daun@...> wrote:

That's another reason I don't care for Apple... They always have to do it "their way". Plus, you have to use a special viewer, which is featureless. Don't get me started.

Daun



On 6/1/2021 3:27 PM, Calvin Guan via groups.io wrote:

Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file? Is there a decoder in Win 10 pro?



--jeff


--
Daun E. Yeagley II, N8ASB
Re: Want To buy: HV transformer for HP 1707B scope.

 

i have a 1710b which is busted, maybe time to start parting it out... i am not home till mid June, but i can ohm it out then...

Maurice
Re: How to fix broken HP key

 

The GNU Image Manipulation Program (GIMP) also supports HEIF/HEIC in
recent versions.

On Tue, 1 Jun 2021 at 17:50, Daun Yeagley <daun@...> wrote:

That's another reason I don't care for Apple... They always have to do it "their way". Plus, you have to use a special viewer, which is featureless. Don't get me started.

Daun



On 6/1/2021 3:27 PM, Calvin Guan via groups.io wrote:

Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file? Is there a decoder in Win 10 pro?



--jeff


--
Daun E. Yeagley II, N8ASB
Re: 8566B Option 002 Turbo (Firmware revision 12.4.91)

 

BTW -- I won't be able to pull the Turbo info from my unit. In replacing the CRT I am only working on the 85662 IF/display unit and not digging into the RF section where the processor card apparently lives.

John
----

On 5/19/21 7:58 PM, Matt Corbett via groups.io wrote:
I just uploaded the parts list/schematic and the installation note for the 8566B Turbo option to the Files section: /g/HP-Agilent-Keysight-equipment/files/8000%20to%209999/8566B%20Turbo%20Option%20R02 </g/HP-Agilent-Keysight-equipment/files/8000%20to%209999/8566B%20Turbo%20Option%20R02>
Sorry, my scanning skills (and tools) are nowhere near the quality of Dave Henderson's, at ArtekManuals. :-(
Re: How to fix broken HP key

 

¿ªÔÆÌåÓý

That's another reason I don't care for Apple...? They always have to do it "their way".?? Plus, you have to use a special viewer, which is featureless.? Don't get me started.

Daun



On 6/1/2021 3:27 PM, Calvin Guan via groups.io wrote:
Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file?? Is there a decoder in Win 10 pro?

?

--jeff


--
Daun E. Yeagley II, N8ASB
Re: E4407B restoration project: EEPROMs

 

Hi Alex,

Were you able to regenerate the YTF alignment/correction data?? I am in the need to do the same for my ESA where the YTF needs to to re-adjusted.? Did you find out the format of the values stored for that on the freq. extension board, and the best way to regenerate the correct values?

Thanks,

--zs
Re: How to fix broken HP key

 

This is a HP5343A 26.5 Ghz counter. I got it from ebay as non-working unit, as CPU won't reset. I took it apart and fixed it.?

I didn't see the missing piece while I was working on it. Now I know what the finger piece looks like. I will take it apart again and try to find the missing piece...

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:44:53 PM PDT, Adrian <adrian@...> wrote:


Ah, now I can see it - thanks! Silly question, are you sure it isn't skulking inside the instrument somewhere? The spring is the usual part that goes walkabout and I've generally recovered them from nooks and crannies within the chassis!

Adrian

On 01/06/2021 20:27, Calvin Guan via groups.io wrote:
Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file?? Is there a decoder in Win 10 pro?

?

--jeff
Re: How to fix broken HP key

 

¿ªÔÆÌåÓý

Ah, now I can see it - thanks! Silly question, are you sure it isn't skulking inside the instrument somewhere? The spring is the usual part that goes walkabout and I've generally recovered them from nooks and crannies within the chassis!

Adrian

On 01/06/2021 20:27, Calvin Guan via groups.io wrote:

Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file?? Is there a decoder in Win 10 pro?

?

--jeff
Re: How to fix broken HP key

 

Hi Daun,

Thank you for the quick reply. I'm in Orange County, California. I will search the message.?

14:46 at the video shows the missing finger piece that I supposed to have. Looks like I will look for some parts unit from eBay.






Regards,
Calvin

On Tuesday, June 1, 2021, 11:59:18 AM PDT, Daun Yeagley <daun@...> wrote:


Those look like Bill West switches to me.? They are very common in HP gear, particularly of the 70's and 80's vintage.? There was just a thread on here about them just in the last week or so. You should be able to salvage parts from an instrument keyboard of that vintage.? Where are you?

Daun


On 6/1/2021 2:37 PM, Calvin Guan via groups.io wrote:
Hi group,

I have a HP5343A frequency counter with a broken "5" key. It's just like a typical key on any HP 80s instrument. Please see attached pictures.

It looks like it's missing a metal piece that would make contact to the keypad on the PCB. I can't find a replacement key. I think I can glue it back on but how would I fix the contact? I can't find replacement part for it.?

Any idea how to fix it?

Regards,
Calvin

--
Daun E. Yeagley II, N8ASB
Re: How to fix broken HP key

 

Hi Jeff,

When I Airdrop them from my phone to my Mac, it uses HEIC format by default -- my bad.

I converted them to JPEG.

Thanks,
Calvin

On Tuesday, June 1, 2021, 12:08:10 PM PDT, J. chang <felix1063@...> wrote:


Without having to install another perhaps malware laden program, what is a .HEIC file?? Is there a decoder in Win 10 pro?

?

--jeff

IMG_8168.jpg
IMG_8169.jpg
IMG_8170.jpg

Re: How to fix broken HP key

 

¿ªÔÆÌåÓý

I just met the same issue - it seems to be an Apple invented image format - like the world needs yet another? - that allows extra data to be embedded in the file and a Windows 10 download will 'enhance' the Windows photo app to allow it to be opened, err....no thanks! Sending images as png or jpeg would be better?
Adrian

On 01/06/2021 20:06, J. chang wrote:

Without having to install another perhaps malware laden program, what is a .HEIC file?? Is there a decoder in Win 10 pro?

?

--jeff
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