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The Blomley Class B amplifier
The Blomley Class B amplifier
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Old 16th September 2021, 07:53 AM   #111
Astaro is offline Astaro  Russian Federation
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Old 16th September 2021, 04:07 PM   #112
apson is offline apson  United States
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I'm still randomly replacing components trying to get mine to work again. It's not going well


Maybe it never worked and I was hallucinating.


I thought Blomley's design was a single supply. I'll give up at some point. For now, I would advise people like me who don't know anything to avoid getting sucked into this project. I'm still trying to find an audio forum geared toward DIYers.



"Change the 200uF to 470uF" they said.



(Looks for a 200uF for 20 minutes, doesn't find one)
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Old Yesterday, 12:30 PM   #113
haiqu is offline haiqu  Australia
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The Blomley Class B amplifier
My boards are here. Time to blow sh1t up.
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Old Yesterday, 12:42 PM   #114
haiqu is offline haiqu  Australia
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The Blomley Class B amplifier
Quote:
Originally Posted by apson View Post
I thought Blomley's design was a single supply. I'll give up at some point. For now, I would advise people like me who don't know anything to avoid getting sucked into this project. I'm still trying to find an audio forum geared toward DIYers.
Hang in there, buddy. It's worth the trouble when you finally hear that creation singing. :-)

Yes, it's a single supply. I see you've asked about capacitor values and voltage ratings a few days ago. For values, use Blomley's original (or the nearest current "preferred" value i.e. 250uF becomes 220uF). For voltage ratings, just look at the circuit and figure out the peak voltage at that point and add 10%. It's not rocket surgery.
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Old Yesterday, 02:54 PM   #115
as_audio is offline as_audio
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Post 111 : can somebody please explain the crazy input stage T1 .. T3 ?
This amp schematic however has nothing to do with Blomley topic.
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Old Yesterday, 03:52 PM   #116
jan.didden is offline jan.didden  Europe
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Correct, it's not a Blomley. Someone took a wrong turnoff ;-)

Jan
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Old Today, 04:54 AM   #117
apson is offline apson  United States
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Quote:
Originally Posted by haiqu View Post
Hang in there, buddy. It's worth the trouble when you finally hear that creation singing. :-)

Thank you for the kind words of encouragement!


I'm going to build another one but with a proper heat sink so I don't kill it again.


I'm going to use the ZTX453 and ZTX553 as well as the BD139/BD140 for Q1/Q8.


I've looked through digikey but I'm still not sure exactly whether there's a suitable part there for to replace the NJW0302G/NJW0281G (which I can only find on eBay).


@egra mentioned "bass response" and a capacitor that doesn't exist in either his schematic nor Blomley's. That's what I was asking about.
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