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Old 10th January 2009, 02:45 AM   #661
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Quote:
Originally posted by ostripper
. . .
I would like to go the "quasi" route and just use 6-8 NPN
IRF 250's to get my 300W.. it might even stay "frugal" with
that arrangement..
OS
Oh, yes. On the same "station" here!

Most heavy duty speaker drivers get facefirst on fidelity at 400w@8R or 800w@4R, so that sort of scale represents something that's more significant than an increment.

It looks like FA1 will have as much power as I need for personal use. My speakers don't scale farther. Its simpler to stack more speakers and amps when needed.

Will let you know how it does, after the shopping is done. I found everything except that LED. Isn't that silly? Can't find it.
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Old 10th January 2009, 04:44 AM   #662
jaycee is offline jaycee  United Kingdom
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Just a thought on the triple... what about trying the split feedback setup that Leach employs on his amp?
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Old 10th January 2009, 05:34 AM   #663
GK is offline GK  Australia
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Those junk SPICE models for the ON Semi driver transistors make any attempt to sim a high power BJT output stage a waste of time. Don't trust that a real circuit will oscillate with these MJE150XX's just because the simulator say so.

Cheers,
Glen
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Old 10th January 2009, 06:06 AM   #664
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Is there better.. please advise...

I haven't made my next order yet..
so I have no problem going japanese..
OS
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Old 10th January 2009, 07:42 AM   #665
jaycee is offline jaycee  United Kingdom
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What about the Fairchild FJP5200/FJP1943 transistor? This is a TO-220 version of their FJL4315/FJL4215 (2SC5200/2SA1943 clones). It looks suitable for driver use.

My experience is that Fairchild's models are generally pretty good, so maybe it is worth simming with their driver and outputs.
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Old 10th January 2009, 11:56 AM   #666
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Yes ,JC, they look good ,but WTF no models. Fairchild
sucks in this way, they have good models for some but are
very incomplete in their listing. They want us to buy their
$#$T ,but don't even supply us with adequate design
resources...ARggg

Maybe I could just use the FJL4315/FJL4215 models,
but those junctions are way larger with more Cob
so that would put me off the mark for starters.

OS
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Old 10th January 2009, 01:55 PM   #667
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Quote:
Originally posted by ostripper
Is there better.. please advise...

I haven't made my next order yet..
so I have no problem going japanese..
OS

Hi OS,
I recommended the 2SC4793/2SA1837 before. These are fast and cheap Toshibas. Andy_C did a model pair for these.

Also, I use these models for the MJE15030/31. They seem to work well:

.MODEL MJE15031 pnp
+IS=7.17489e-11 BF=457.169 NF=1.11376 VAF=6.01557
+IKF=0.345808 ISE=1e-08 NE=2.18567 BR=0.247882
+NR=1.39549 VAR=60.1557 IKR=0.0263893 ISC=1e-16
+NC=2.89486 RB=2.29208 IRB=0.0114006 RBM=0.000102795
+RE=0.00815557 RC=0.0407779 XTB=0.1 XTI=0.1
+EG=1.05 CJE=1.64037e-09 VJE=0.819491 MJE=0.537987
+TF=1.60991e-09 XTF=180.82 VTF=1.16561 ITF=6.50499
+CJC=4.82516e-10 VJC=0.4 MJC=0.374287 XCJC=0.786653
+FC=0.712788 CJS=0 VJS=0.75 MJS=0.5
+TR=3.32795e-08 PTF=0 KF=0 AF=1


.MODEL MJE15030 npn
+IS=3.894e-11 BF=312.524 NF=1.0979 VAF=9.9963
+IKF=0.796201 ISE=2.37397e-09 NE=1.94897 BR=0.14246
+NR=1.64791 VAR=99.9749 IKR=0.00539895 ISC=2.33175e-09
+NC=2.79024 RB=267.202 IRB=9.99994e-13 RBM=0.299835
+RE=3.04316e-05 RC=0.252928 XTB=0.1 XTI=3.92812
+EG=1.05 CJE=2.42998e-09 VJE=0.794171 MJE=0.569313
+TF=1.87986e-09 XTF=1000 VTF=1835.34 ITF=270.188
+CJC=2.43127e-10 VJC=0.4 MJC=0.361453 XCJC=0.802892
+FC=0.8 CJS=0 VJS=0.75 MJS=0.5
+TR=9.86194e-06 PTF=0 KF=0 AF=1


I can't remember where I got them from.
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Old 10th January 2009, 02:10 PM   #668
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Quote:
By MJL - I recommended the 2SC4793/2SA1837 before
Do you have those,since you use them, already have the mje's
I'm moving on to MOSFET's ,they are killer...
But I still want the fast drivers...

Now I will do the "Beast"... (attached)
OS
Attached Images
File Type: gif fbeast.gif (23.9 KB, 365 views)
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Old 10th January 2009, 02:17 PM   #669
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Quote:
Originally posted by ostripper


Do you have those,since you use them, already have the mje's

Those are the same models for the MJE's you have Carlo...er, I mean OS?

The models for the 4793/1837 are:

.MODEL 2SC4793 NPN
+ IS=1.8E-09 NF=1.43 BF=146.38 VAF=273 IKF=2.6
+ ISE=6.286997E-10 NE=2.223629 BR=4 NR=1
+ VAR=20 IKR=1.05 NK=0.95
+ RE=0 RB=1.7 RC=1.25 CJE=5.96964E-10 VJE=1.1 MJE=0.5
+ CJC=5.78E-11 VJC=0.3 MJC=0.3 TF=1.22678E-09 FC=0.5
+ ITF=10 XTF=99.52253015 TR=.983e-06

.MODEL 2SA1847 PNP
+ IS=2.39372559E-10 NF=1.304015937 BF=300 VAF=273
+ IKF=2.087725944 NK=0.94719458 ISE=1.46829699E-11
+ NE=1.526663542 BR=4 NR=1 VAR=20 IKR=1.05
+ RE=0 RB=1.8 RC=1.65 CJE=4.7407E-10
+ VJE=1.1 MJE=0.5 CJC=8.6700E-11 VJC=0.3 MJC=0.3
+ TF=1.642191E-09 FC=0.5 ITF=1.076260106
+ XTF=5.868994022 TR=1.38e-06
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Old 10th January 2009, 02:25 PM   #670
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Many thanks , Mjl. I definitely am not carlos ,for he would call
you "a boring person" and tell you to leave his thread for
posting LT stuff after a long boring diatribe.
OS

ahh ,drivers are "sher gut"..
Attached..
Attached Images
File Type: gif fbeastolg.gif (13.9 KB, 303 views)
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