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Old 6th February 2013, 02:18 PM   #8331
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Basilar Membrane Motion 1: Two Tones - Animation | Auditory Neuroscience
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Old 6th February 2013, 05:05 PM   #8332
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So that is how it works..... A mechanical crossover fiter.
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Old 6th February 2013, 05:09 PM   #8333
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This one is cool:
JPL Small-Body Database Browser
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Old 6th February 2013, 05:09 PM   #8334
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An this movie of the sun.... hot:
http://www.solarviews.com/raw/sun/UV1600_eastlimb.mov
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Old 6th February 2013, 05:19 PM   #8335
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Full site:
Space - Page 1
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Old 6th February 2013, 07:43 PM   #8336
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Yes, the ear can diffentiate two tones when they are not too close together in frequency.
The tones are lokalized on the basilar membrane.
When the tones are very close together it is likely that we hear only the louder tone.
That is masking. The ear has about the resolution of a 30 band parametric equalizer.
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Old 7th February 2013, 08:15 PM   #8337
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Here is one more measurement with the DCA75.
This is the MJE15030, 15031 pair.
This trannies have very low Rbb`of around 10 Ohm and would be a nice pair up to 10mA if there whould not be a big Hfe diffence of more then double. Here the PNPs are much stronger with Hfe over 300 in 25 pairs i measured. The NPNs hover at under Hfe 150.
Also as predicted by Kean they do not match well in the saturation area, so they are not that good for current mirrors, something they have in common with other higher voltage BJTs.
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File Type: jpg MJE15030 MJE15031.JPG (138.1 KB, 135 views)
File Type: jpg MLE15030 MJE15031 saturation.JPG (132.8 KB, 132 views)
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Old 7th February 2013, 08:37 PM   #8338
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Here is the Toshiba super low Rbb`pair 2SA1316GR, 2SC3329GR.
Great match in Hfe but not very complimentary at higher idle.
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Old 7th February 2013, 08:52 PM   #8339
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The Hitachi-Renesas 2SA1085E, 2SC2547E.
Some Hfe mismatch but that can be helped. I picked this pair randomly.
So far the best symmetry of the ultra low Rbbe´types. One of my favourites if you can get them.
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Old 7th February 2013, 09:10 PM   #8340
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ROHM 2SB737, 2SD786.
Great pair, obsolete.
Even higher early voltage then the Hitachis, less Hfe.
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