BD139-16 & BD140-16? Anyone use these transistors? - Page 5 - diyAudio
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Old 31st January 2013, 10:35 PM   #41
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by terranigma View Post
You must have a capacitance meter which able to measure in picofarads.
actually, I'm lucky to have one I use for my speaker projects

will look at it tomorrow
thanks!
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Old 1st February 2013, 09:47 AM   #42
tinitus is offline tinitus  Europe
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capacitance figures seems quite high
fluctuates on the pf setting
nf setting gives stable readings


testing Hfe with multimeter appear to give correct readings, around 40
but I need a more stable way to connect transistor to meter
maybe just solder small wire bits to the legs for easy plug in
hmm, a sil/dil socket, or something
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Old 23rd March 2013, 07:13 AM   #43
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Quote:
Originally Posted by jacco vermeulen View Post
Back in the old days you had to open a semiconductor book to look at a datasheet, instead of clicking a pdf.
Of course, the semiconductor data book comes free if you've got a relative employed at the Philips NatLab in Eindhoven.
Free online datasheets often are abbreviated versions, sometimes saves you 10 to 14 pages.

A bunch of BD139/140s in parallel make a fantastic class A headphone amp output stage.
Philips versions are much nicer, Cob of 5.7pF, downside that the power they handle is 2/3d of the different die version.
Does anyone have a couple of genuine Philips BD139-16 and BD140-16 pairs for sale?
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Old 29th September 2013, 02:32 AM   #44
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you can use stmicro bd's they're good in audio drivers I've tried them.
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Old 29th September 2013, 09:56 AM   #45
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Capacitance will be high without sensible values of Vce.
Philips used to make some very good medium power transistors for video monitor amplifiers, around 200V working, high speed and low and reasonably constant capacitance
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