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Old 27th June 2002, 01:13 PM   #11
e96mlo is offline e96mlo  Sweden
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Pspice is a simulation software so if simulating is what you want to do it might be a good choice.

If you want to do PCB layouts then Eagle is a great and cheap choice. You draw your schematic and then you convert to PCB. Can be downloaded from their homepage www.cadsoft.de.
Recomended!

/Marcus
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Old 27th June 2002, 01:25 PM   #12
Duo is offline Duo  Canada
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Thanks!
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Old 27th June 2002, 02:53 PM   #13
Duo is offline Duo  Canada
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Here is the proper diagram for my amplifier.
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Old 27th June 2002, 03:08 PM   #14
e96mlo is offline e96mlo  Sweden
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It wouldn't sound very good (if at all) since you have connected the base of the VAS transistor to negative supply.

I still think you should study the diff stage more and make some improvements.

/Marcus
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Old 27th June 2002, 03:10 PM   #15
sonnya is offline sonnya  Denmark
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I do not think that 2n3906 likes your +/-60V!!!

Sonny
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Old 27th June 2002, 03:21 PM   #16
e96mlo is offline e96mlo  Sweden
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Nope. Neither does the BD139/140. At least not if you want to be on the safe side. The O/P devices will manage though.

You need at least a 120 V collector-emitter rating.

/Marcus
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Old 27th June 2002, 03:23 PM   #17
Duo is offline Duo  Canada
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Hmmm, as far as I remember in some esp schematics, the VAS was grounded at the emitter and also, they used a 2n3906 setup on 55 volts, which isn't far off of mine...




EDIT, ooops, I see that my diagram does show a base tied to ground, when I actually intended for it to go to a 1k pot on the long tailed pair.... Darn Gotta fix that quick no wonder the simulator didn't like it!
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Old 27th June 2002, 03:25 PM   #18
Duo is offline Duo  Canada
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and the BD139/140 are rated at 150 vce
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Old 27th June 2002, 03:33 PM   #19
Duo is offline Duo  Canada
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in Rod Elliot's projecto of the 300w sub amp, he has a supply rail to rail of 110 volts and uses bc546 transistors rated at 40vce
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Old 27th June 2002, 03:34 PM   #20
Geoff is offline Geoff  United Kingdom
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Duo

I don't know your source of information, but the datasheets from Philips, Fairchild and ONSemi all quote a Vceo maximum of 80V.

Geoff
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