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Old 13th January 2012, 11:27 PM   #1821
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andrew
dont forget to put bias control
bias trimer
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Old 13th January 2012, 11:33 PM   #1822
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Default bias control

Hi Engel Dela Pena
greetings please can you give me pages of TEF STAGE on h900
thread and post where sir apex audio showed where to put preset
warm regards
andrew lebon
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Old 14th January 2012, 12:04 AM   #1823
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andrew
bias control
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Old 14th January 2012, 12:05 AM   #1824
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tripple ef
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Old 14th January 2012, 12:13 AM   #1825
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i start pcb on sunday
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Old 14th January 2012, 02:22 AM   #1826
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you can use irvynjay lay out of step
regards
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Old 14th January 2012, 03:05 AM   #1827
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Default POST 1823

how did BD 681 COME its darlington transistor i think final pcb design be like soerdjanto TEF PCB but no protection on pcb
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andrew lebon
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Old 14th January 2012, 09:11 AM   #1828
AndrewT is offline AndrewT  Scotland
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post1823
R23 must be wrong. 2k2 could be a better value.
The Vbe multiplier output voltage should be around 2400mV, when output bias is set 5mV.
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Old 14th January 2012, 01:44 PM   #1829
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Quote:
Originally Posted by AndrewT View Post
post1823
R23 must be wrong. 2k2 could be a better value.
The Vbe multiplier output voltage should be around 2400mV, when output bias is set 5mV.
R23 is OK, the Vbe multiplier output voltage with darlington should be around 3600mV max.
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Old 14th January 2012, 02:45 PM   #1830
AndrewT is offline AndrewT  Scotland
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my oops.
The Vbe multiplier voltage should be around 3600mV.
R23 is still wrong.
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