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18th February 2002, 01:46 AM  #1 
diyAudio Member

Finding SPICE Models
I'm building up a SPICE model of an amp I'm working on, and I'm finding that models of the transistors are incredibly hard to find. The amp is a High Voltage amp, used to directdrive a set of home made electrostatic headphones. The design is the one Kevin Gilmore produced to drive Omega commercial electrostatics, http://headwize.com/projects/showpro...lmore2_prj.htm
My hope is, after i build this, I can scale it up for use as a solidstate directdrive amp for a full size set of ESLs. In any case, I'm having real difficulty finding the following transistor models: 2SC1815 2SA970 2SA1156 2SC2240 2SC3675 2SC2705 This is, in fact EVERY transistor type in the circuit but one; obviously I'm having trouble finding what i need. The only one I've found is the 2SK389, and even then I'm not so sure that model is entirely accurate. If anyone could help me out with any of these models, or better yet show me a few good resources for finding SPICE models, I would be forever grateful. Thanks. 
18th February 2002, 01:47 PM  #2 
diyAudio Member
Join Date: Dec 2000
Location: Knabstrup, Holbaek

Send me your email adress, and I'll send you 2 libraries with all the models but 2SC3675.
BTW what simulator are you using?
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Regards Hoffmeyer ;0) 
18th February 2002, 08:00 PM  #3 
diyAudio Member
Join Date: Feb 2001
Location: Northern Iliinois

any good JFET models available???
Well, while we're asking, can anybody point to (or send) models of Toshiba's 2SK170 and 2SJ74? The other parts referred to would be nice, but not needed at this time
I use the FREE spice simulator from Linear Technology mlloyd1 
19th February 2002, 05:54 AM  #4 
diyAudio Member

Lots of thanks to Ole Hoffmeyer Lund for his gracious provision of the SPICE models I was looking for. Sadly, though, it seems OrCad library files (.PLB and .SLB) are not in standard SPICE subcircuit format. Circuitmaker 2k didn't seem to like that at all. So if anyone out there knows the best way to read OrCad libraries as regular ASCII text SPICE models, please pass along the knowledge. Otherwise, if anyone can dig up the above listed transistors in a different format, that'd be a decent second choice.
Also, in either case, I'm still looking for the 2SC3675 model. This is evidently a specialpurpose high voltage transistor, often times used in computer monitor's to control high voltage tube bias. I'm taking Kevin Gilmore at his good word that this transistor performs acceptably as an audio high voltage device. Once I can sim my amp and the few tweaks I've made, I'll build it and see. Thanks everyone for the time and attention, good luck on your respective projects.  Jonathan 
19th February 2002, 03:21 PM  #5 
diyAudio Member

Just for general info, I did find a .lib form of the spice models, so I now have all of the transistor models I was looking for, except Sanyo's 2SC3675.
If anyone wants the regular subcircuitstyle model libraries, i can direct you to them. And of course, if anyone can turn up a reasonable model of the 2SC3675, that'd be great. Also, if anyone knows a good way to write a spice model from a data sheet, I DO have the 2SC3675's data sheet. But I dont know how to generate a matching model. Any help there would be great also. Thanks everyone.  Jonathan 
21st February 2002, 12:14 AM  #6 
diyAudio Member
Join Date: Oct 2001
Location: London, England

Modelling
Does any one know where to get hold of a full version of a program such as "Spice Mod" from the makers of ICAP4.
I this program or an equivalent badly, but the demo version is far too limited and I can't afford it. Any help would be great. Nick.
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Real Engineers do it on a budget..... 
27th February 2004, 07:54 AM  #7 
diyAudio Member

spice model of 2SC1815GR 2SA1015,does any one know them?

27th February 2004, 11:20 AM  #8  
diyAudio Member
Join Date: Jan 2004

Quote:
The Japanese power devices can be found in jpwrbjt.lib.
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 Hannu 

27th February 2004, 11:32 AM  #9 
diyAudio Moderator Emeritus
Join Date: Jan 2003

The normal 2SC1815 has a Hfe between 70 and 140. The Y between 120240, the GR between 200400 and the BL between 350700.
.MODEL 2SC1815G NPN (IS=81.2039P BF=130.444 NF=1.22428 VAF=251.702 IKF=1.05399 + ISE=1.76673P NE=1.65186 BR=7.21621 IKR=16.9232M ISC=3.03555N NC=1.78127 + RE=1.06272 RC=279.03M CJE=2P MJE=500M CJC=7.81791P VJC=700M MJC=499.93M + TF=1.94501N XTF=500.013M VTF=10 ITF=10.0727M TR=10N ) .MODEL 2SC1815 NPN (IS=9.99315F BF=192.019 NF=1.01109 VAF=311.281 IKF=214.789M + ISE=124.464F NE=1.51791 BR=4.99998 IKR=980.183 ISC=33.4247F RE=2.96389 CJE=2P + MJE=500M CJC=7.82341P VJC=700M MJC=500.188M TF=512.206P XTF=183.171M + VTF=9.97698 ITF=9.76409M TR=10N ) .MODEL 2SA1015 PNP (IS=10.0004F BF=239.283 NF=996.198M VAF=100 IKF=172.882M + ISE=43.1361F NE=1.44709 BR=5 IKR=961.305 ISC=121.849F RE=1.05432 CJE=2P + MJE=500M CJC=15.6333P VJC=700.001M MJC=499.871M TF=601.795P XTF=163.532M + VTF=9.93432 ITF=9.63234M TR=10N ) /Hugo 
29th February 2004, 10:28 AM  #10 
diyAudio Member

Oh!I want to say 2SC1815GR ?
Thank a lot! 
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