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Old 21st January 2012, 08:56 PM   #4691
hesener is offline hesener  Germany
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Quote:
Originally Posted by Joachim Gerhard View Post
Hesener, C5 should be 1uF printed on the PCB and not 100nF i think, i also can not find the 1MOhm resistor from output to servo.
noted, thanks
the 1M is upper righthand corner, between bc337 and 6.8nf caps
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Old 21st January 2012, 09:03 PM   #4692
hesener is offline hesener  Germany
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Quote:
Originally Posted by Joachim Gerhard View Post
What is the big, single 15kOhm resistor in the middle of the PCB, left of the RIAA ?
thats R19, where michael said to let space for a bigger resistor due to higher power dissipation
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Old 21st January 2012, 09:06 PM   #4693
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"She blinded me by science" Thomas Dolby
I already stuffed it !
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Old 21st January 2012, 09:07 PM   #4694
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Try Pana FR as well while you're ordering.
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Old 21st January 2012, 09:08 PM   #4695
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It is under the 15 Ohm resistor.
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Old 21st January 2012, 09:10 PM   #4696
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Why ?
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Old 21st January 2012, 10:08 PM   #4697
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Why ?
Most probably for thermal constraint, automotive design normally would be for -50C to +100C many (many many ...) cycles. Internal bounds, lead bounds and material tolerance could be at risk.

(that is where I come from )
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Old 21st January 2012, 10:19 PM   #4698
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Thumbs up (that is where I come from )

Well well, we can shake hands than buddy

Likewise here and agree fully with you.


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Old 21st January 2012, 10:28 PM   #4699
hesener is offline hesener  Germany
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Talking stuffing is finished ;-)

boards are full - power up planned for monday ;-)

this is with LCR caps, Dale resistors, and as good a matching as I could get. Input transistors are matched to 0.7% between all of them, the rest less... Its probably required to order 200...300pcs of each transistor type to get a perfect matching.....
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Old 21st January 2012, 10:29 PM   #4700
FdW is offline FdW  Netherlands
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Originally Posted by Audiofanatic View Post
Well well, we can shake hands than buddy

Likewise here and agree fully with you.


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Cool, and I can be a bit more specific on that. Once (a long time ago) I worked for Motorola, HP and International Rectifier (among others) as an industrial 'components in-design specialist', working with our customers helping with their designs (at the customer’s site) mostly do select components to fit them to their specific environment. I have done planes, trains and automobiles (among others, including the particle accelerator in Cern ).
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