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Old 21st February 2010, 04:57 AM   #31
tomchr is offline tomchr  United States
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In my prototype, I'm running about 7 mA through the diode stack and 75 mA through the output devices. I'm not seeing any bias stability issues. The supply voltage is +/-45 V.

This is with a tiny heat sink and my target supply voltage is +/-60 V. But still... Looks darn good.

I'm currently using 1.5 kOhm between the SINK and SOURCE pins.

I've measured the THD at output powers from 100 uW to 1 W as this is where the amp is likely to operate the majority of the time for casual listening. I don't see any harmonics peek up above the noise floor (85 dB dynamic range on the test gear) until I hit 1 W output. The THD graph posted a few posts back looks like my results.

For those interested, I have more details in this thread.

~Tom
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Old 14th February 2011, 07:04 PM   #32
Telstar is offline Telstar  Italy
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Interesting devices these sanken darlingtons.
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 8th November 2011, 07:45 AM   #33
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JACINNJ VERY GOOD AND GREAT IDEA FOR MONITORING INDICATION OF METER THANKSSSSSSSSSSSSSSSSSSSSSSSSS
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Old 8th November 2011, 03:08 PM   #34
AndrewT is offline AndrewT  Scotland
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WHAT, I can't hear you over the noise.
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