CA3046 replacement ?

[Tim Ressel]

Paul -- Could you explain in further detail the failings as you see them in the
3046 transistors? I am considering a replacement transistor pair with a strap-on
heater.

Tim Ressel -- Hardware DQ
Hewlett-Packard
Verifone Division
916-630-2541
tim_r1 at verifone.com



> ----------
> From: 	Paul Maddox[SMTP:space_banana at hotmail.com]
> Sent: 	Tuesday, July 06, 1999 2:45 AM
> To: 	martin.czech at intermetall.de
> Cc: 	synth-diy at mailhost.bpa.nl
> Subject: 	Re: CA3046 replacemnt ?
> 
> MC,
> 
> >If you look at the 3046 specs you can see that the bipolar parameters
> >indicate the transistors being crap. rbe and hfe @ large currents.
> >This will normaly make the expo converter going flat.
> >Extra circuitry can measure this and compensate via feedback loop,
> >but it would be better to use better npn right from the start.
> >
> >But since the 726 isn't any more we don't have that option.
> >
> 
> Could use the LM394, and a stick a regulator on top, 7805 and give it a 
> fixed load..
> 
> Paul
> 
> 
> 
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