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Old 20th May 2013, 01:52 AM   #1
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Default Retro Amp 50W Single Supply

Old single supply topology no need DC protect
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Old 20th May 2013, 12:58 PM   #2
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Is it good practice to have the input of the amplifier absolutely not guarded against RF ?

is it good practice to have extremely fast drivers to drive too slow outputs ?

Also 2200ufd in the output will only serve as a memory of the past now days i think far more is needed

Kind regards
Sakis
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Old 20th May 2013, 01:16 PM   #3
AJT is offline AJT  Philippines
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Quote:
Originally Posted by apexaudio View Post
Old single supply topology no need DC protect
nice post Apex, i built my first amps in the mid 70's based on your circuit...
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Old 20th May 2013, 01:25 PM   #4
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Tony,

It sounded good though, didn't it?

This is quite sophisticated actually......

Hugh
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Old 20th May 2013, 01:31 PM   #5
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Hi,

Me too have built my first amp based on a circuit similar to this one.

The output cap is within the ac feedback loop - this lessen output cap size requirements somewhat. But a small output cap will limit power bandwidth. Better use to use 4700uF or more.
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Old 20th May 2013, 05:16 PM   #6
Orit is offline Orit  Italy
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Would it be worth to add the Baxandall diode ?
And a capacitor between the bases of the complementary pair ?
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Old 20th May 2013, 05:40 PM   #7
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Since the Leak Delta 70 schematic is available in this forum, I don't see the point of posting this, exactly. Unless you are selling PWB's, but the Leak has a variable bias current potentiometer, and this doesn't. I build stuff like this point to point on Nema LE laminate because of the fool-resistant speaker protection, but this circuit is even more basic than djoffe's bias current measuring modification of the ST120.
If you're selling stuff, a link through facebook is a black hole to me. Facebook won't show anything unless you give them your birthdate, and that is a security code to my retirement accounts, I don't give that away. People will have to pay a credit bureau to get my birthdate, the one that floats around the internet is a fake. To sell things try Amazom.com, they don't require an up to date computer to participate, nor a pay-pal account like e-bay. And Amazon's list of credit card numbers hasn't hit the news has having been hacked and sold, yet.
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Last edited by indianajo; 20th May 2013 at 05:43 PM.
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Old 20th May 2013, 07:30 PM   #8
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Quote:
Originally Posted by Tony View Post
nice post Apex, i built my first amps in the mid 70's based on your circuit...
Sound is good and this circuit still have many fans
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Old 20th May 2013, 07:38 PM   #9
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Originally Posted by AKN View Post
Hi,

Me too have built my first amp based on a circuit similar to this one.

The output cap is within the ac feedback loop - this lessen output cap size requirements somewhat. But a small output cap will limit power bandwidth. Better use to use 4700uF or more.
Cap diametar on pcb is 25mm, 6800uF/50V or 4700uF/63V can be use with this pcb.
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Old 20th May 2013, 09:55 PM   #10
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Originally Posted by indianajo View Post
Since the Leak Delta 70 schematic is available in this forum, I don't see the point of posting this, exactly. Unless you are selling PWB's, but the Leak has a variable bias current potentiometer, and this doesn't. I build stuff like this point to point on Nema LE laminate because of the fool-resistant speaker protection, but this circuit is even more basic than djoffe's bias current measuring modification of the ST120.
If you're selling stuff, a link through facebook is a black hole to me. Facebook won't show anything unless you give them your birthdate, and that is a security code to my retirement accounts, I don't give that away. People will have to pay a credit bureau to get my birthdate, the one that floats around the internet is a fake. To sell things try Amazom.com, they don't require an up to date computer to participate, nor a pay-pal account like e-bay. And Amazon's list of credit card numbers hasn't hit the news has having been hacked and sold, yet.
This amp is very different compare to Leak Delta 70. I don't selling stuff, you must diy PWB's for this amp
Regards
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