Products > Test Equipment
Cloning the HP3325A Option 002 - HV Output
Jay_Diddy_B:
Hi,
This thread is dedicated to cloning the high voltage option board A8 used in the HP3325A option 002 HV Output.
I have successfully cloned this board in the past, but I have lost the files.
Here are pictures of my clone:
I have attached the section from the manual.
I remember entering the schematic from the manual and then placing the components in the same place and orientation as the HP original. I used the net list as a guide as where to route the tracks.
I used MPS8099 (NPN) and MPS8599 (PNP) for all the small transistors. Q1 on the original is a dual transistor. I just used two MPS8099 glued together.
I used MJE243 (NPN) and MJE172 (PNP) for the output transistors.
Regards,
Jay_Diddy_B
TERRA Operative:
I think I'll do a similar thing re. placing the components to replicate the HP layout, with maybe a few little alterations as I find along the way to neaten the routing etc.
I have been having a look at cross referencing of the silicon so far.
So far I have this (Subject to change):
(Part numbers from Digikey)
* Dual NPN Transistor 1854-0475 (supersedes to 1854-1030 and 1854-0688) - MAT01GHZ + heatsink 323005B00000G
* All PNP transistors - 2N3906
* 15V Zener 1902-3205 - 1N5245
* 30V Zener 1902-0244 - 1N4751
* Switching Diode 30V 1901-0040 - 1N4148
* Switching Diode 80V 1901-0050 - 1N4150
Other parts so far:
* RCA Socket - RCJ-021
* TO-220 Heatsink - V2109B
* 3-Pin Connector - Molex KK5273 Series - 0009652038
* Bridge Rectifier MDA202 - KPB204G
Jay_Diddy_B, what did you use for the board interconnects? I am looking for short pre-made 90o RCA cables but I haven't turned up anything with a quick search yet..
Also, what are the dimensions of your board?
Jay_Diddy_B:
--- Quote from: TERRA Operative on April 07, 2019, 04:00:46 am ---
Jay_Diddy_B, what did you use for the board interconnects? I am looking for short pre-made 90o RCA cables but I haven't turned up anything with a quick search yet..
Also, what are the dimensions of your board?
--- End quote ---
I measured the board that I made:
The holes are 0.250 inches in from the sides. The board is 4.600 x 2.350 inches. (too big for the 100mm x 100mm cheap boards :( )
Regards,
Jay_Diddy_B
TERRA Operative:
Awesome, thanks.
Yeah, I thought it would be too big for the cheap boards.. :(
Ah well, it's still not tooooo expensive anyway. I wonder if there is anywhere that will do gold plating and also clear or no solder mask to match the old HP style PCB? :D
Jay_Diddy_B:
Hi,
I have put together an LTspice model for the amplifier. I have picked some transistors that I am familiar with in the LTspice library. This is the same as the original HP circuit. I haven't done any tweaks.
I haven't compared these results to the hardware.
I have attached the model.
Regards,
Jay_Diddy_B
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