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Old 10th February 2013, 07:06 AM   #351
naf is offline naf  Indonesia
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ok, load with 1k2 paralel... still no change
will check further...
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Old 10th February 2013, 07:54 AM   #352
naf is offline naf  Indonesia
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found red led reversed A-K.
now red flashing when powered up.
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Old 10th February 2013, 08:32 AM   #353
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Alright! How's output AC and voltage drop?
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Old 10th February 2013, 08:38 AM   #354
tinitus is offline tinitus  Europe
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hey, did I mention that I can switch the power on and off without the slightest noise in speakers tested a hundred times now and never failed
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Old 10th February 2013, 08:44 AM   #355
naf is offline naf  Indonesia
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load with 600r.
ac in 0.148v
ac out 0.117v

dc in 22.11v
dc out 20.77v
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Old 10th February 2013, 10:29 AM   #356
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Yep, that's one of the potential effects of the Kmultiplier. For a simple circuit like yours it makes sense. Other people's experiences may vary.

Naf, add a 10u-100uF cap across the output and see what happens. If that changes nothing, measure Vbc and Vbe for each transistor, and voltage across R2. Maybe you could post a picture in case there is a layout/routing mistake.
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Old 10th February 2013, 10:54 AM   #357
naf is offline naf  Indonesia
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hi kean,
adding 100uf at output
ac out decrease to 0.098v
ac in 0.143v

next try measuring vbc/vbe each tr
i make on veroboard will take picture.
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Old 10th February 2013, 11:12 AM   #358
naf is offline naf  Indonesia
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measuring with load 600r and 100uf at output

sa1837
vbc 1.46v
vbe -0.625

bc337
vbc -0.43
vbe 0.512
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Old 10th February 2013, 11:39 AM   #359
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This doesn't make sense. Vbc(Q2)=Vce(Q1) in a normally working circuit. Why not here? Broken joint? Also Vce(Q2) adds up to 2V but your voltage drop was 1.4V. Did you make each measurement with the positive probe on the base or did you switch?
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Old 10th February 2013, 01:53 PM   #360
naf is offline naf  Indonesia
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found broken connection
here measurement after resoldering
dc in 21.4v
dc out 18.8v

ac in 0.134v
ac out 0.074v

positip probe on base
sa1837
vbe -0.62
vbc 1.43

bc337
vbe 1.15
vbc -0.7
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