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Spice model for Russian KP903A JFET?
Spice model for Russian KP903A JFET?
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Old 12th January 2019, 08:45 AM   #1
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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Default Spice model for Russian KP903A JFET?

Hi folks

Has anyone got a Spice model for the Russian KP903A JFET transistor?
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Old 15th January 2019, 04:16 PM   #2
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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I managed to find the datasheet, is anyone able to decipher this and produce a Spice model from the data?
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File Type: jpg 91B5fdIC5yL._SL1500_.jpg (196.0 KB, 128 views)
File Type: jpg 91m2IQ11+oL._SL1500_.jpg (219.7 KB, 129 views)
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Old 17th January 2019, 07:58 AM   #3
BesPav is offline BesPav  Russian Federation
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Default Spice model for Russian KP903A JFET?

How do you really want to use them?

Take NI Multisim, CP-650 datasheet and you’ll be able to create +-realistic model.

SPICE Model Creation from User Data | Online Documentation for Altium Products

Last edited by BesPav; 17th January 2019 at 08:25 AM.
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Old 18th January 2019, 03:41 AM   #4
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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The plan is to use 5 per channel to make a fleawatt stereo amp.

Never heard of NI Multisim, I'll look it up, cheers.

I found the CP650 datasheet, never thought to look at it, spacibo.
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File Type: png CP650.png (47.6 KB, 108 views)
File Type: png CP650 (1).png (32.3 KB, 105 views)

Last edited by Ian Greenhalgh; 18th January 2019 at 03:46 AM.
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Old 18th January 2019, 05:17 AM   #5
BesPav is offline BesPav  Russian Federation
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Quote:
Originally Posted by Ian Greenhalgh View Post
The plan is to use 5 per channel to make a fleawatt stereo amp.

Ok.
What gain? Or just follower?
Maybe better to pick cheap LU1010 at ebay?

Quote:
Originally Posted by Ian Greenhalgh View Post
spacibo

Nothing for aka «не за что».
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Old 19th January 2019, 09:33 AM   #6
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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I've already got quite a few LD1010Ds, I'm currently building a small amp using 5 per channel:

Simple Class A Amp using JFET Output Devices

I obtained 10pcs of the KP903A from a friend in Hungary, traded them for some Motorola OC35 Germanium TO-3 he wanted for some reason.

I have no idea what topology of design to make with the KP903, it's just a case of I have them and would like to use them, so I'm open to any and all suggestions.
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Old 23rd January 2019, 03:14 AM   #7
IanHegglun is offline IanHegglun  Australia
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Quote:
Originally Posted by Ian Greenhalgh View Post
... I'm open to any and all suggestions.
Hi Ian,

I designed this one for Pawel
IansEchoAmp - Google Drive
and simulated it for proof of concept, distortion and power dissipation checks. I haven't made one.

It uses a floating +/-5V supply. It can be changed to a stage with gain by grounding the 5V centre rail and removing the ground of the 40V center rail (ie floating 40V rails). The Area=2 means two in parallel for 100W. For a 50W version use only one.

I can share the LTspice file if you want, also my LU1014 model I created using the VDMOS for a better fit to the datasheet (you can see how I added param Mu=10 using a VCVS).
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Old 30th January 2019, 11:30 AM   #8
bordodynov is offline bordodynov  Belarus
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See
.model kp903a njf vto=-6 beta=13m lambda=10m rs=0.36 rd=0.3 is=1n cgd=80p cgs=80p kf=3.e-17 af=0.5 b=1 mfg=ussr
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Old 1st February 2019, 08:43 PM   #9
panos29 is offline panos29  Greece
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Default Kp903

Kp903 is an amazing device ! I have tested 2 dozens in various configurations and it is truly superb, especially in line amplifier duty. But there is a catch, unfortunately part to part parameter variation is huge by any standards! My fets were bought from 3 different suppliers and parameters were off by a 50%! This makes the parts unusable. Though for some applications you can find 2-3 matching pairs for a line amplifier let’s say.
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Old 10th February 2019, 10:08 PM   #10
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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Hi folks

Thanks for the help, sorry it took me so long to respond, but my parents are ill and I've been looking after them so not had any spare time to devote to hobbies.

I was thinking of building a low power amplifier using my KP903s, 5 per channel as output devices.

I've got a few other projects to finish off first though, so I'll not actually build itfor a little while yet, right now I need to figure out what design to use.

I shall study Ian's Echo Amp, sounds rather intriguing, so thanks for sharing that.
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