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Old 6th July 2013, 07:16 PM   #3081
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While I'm here I'd like to ask Apex his advice on reducing the gain of the A100; I'm connecting my DAC directly to the input and listening levels can get quite high! Thanks, James
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Old 8th July 2013, 06:33 AM   #3082
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Dear Rainwulf,

I got very excited when I saw your power supply. And wondered whether the additional enhancements had sated your desire. I had attempted to introduce some alternative power supply design ideas here Power Supply Resevoir Size . Thank you for sharing. Wonder in which thread we may explore these issues.

kind regards,

Harrison.
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Old 8th July 2013, 06:48 AM   #3083
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Default ultra low budget class a amplifier

Made from bits 'n pieces lying around. Ultra simple class A amplifier with BC546/BD139/TIP3055 and capacitance multiplier in powersupply.
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Old 8th July 2013, 01:16 PM   #3084
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Quote:
Originally Posted by jamesjbrookes View Post
While I'm here I'd like to ask Apex his advice on reducing the gain of the A100; I'm connecting my DAC directly to the input and listening levels can get quite high! Thanks, James
Use 2k2 instead 560R or some other value...
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Old 8th July 2013, 01:25 PM   #3085
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Originally Posted by sevenup2278 View Post
Made from bits 'n pieces lying around. Ultra simple class A amplifier with BC546/BD139/TIP3055 and capacitance multiplier in powersupply.
Do you have schematic?
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Old 8th July 2013, 01:37 PM   #3086
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Originally Posted by mhouston View Post
Do you have schematic?
The powersupply is: Capacitance Multiplier Power Supply Filter

The amp pcb I have to check.
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Old 8th July 2013, 02:34 PM   #3087
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Originally Posted by apexaudio View Post
Use 2k2 instead 560R or some other value...
Many thanks! This amp has never failed to impress me, as you said yourself it produces high-end results from easily obtainable components.

Regards,

James
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Old 9th July 2013, 11:50 AM   #3088
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Quote:
Originally Posted by OnAudio View Post
Dear Rainwulf,

I got very excited when I saw your power supply. And wondered whether the additional enhancements had sated your desire. I had attempted to introduce some alternative power supply design ideas here Power Supply Resevoir Size . Thank you for sharing. Wonder in which thread we may explore these issues.

kind regards,

Harrison.
Well its a classic Low Pass PI Filter. CLC. There is a slight resistance in the inductors as well so its also a bit of a CRC filter as well.

I have removed the MKT caps across the caps though after reading this thread:
paralleling film caps with electrolytic caps

Bypassing the electros so far away from the actual amp modules is a waste of time, and can actually cause oscillation. Since there is a fairly powerful class D amp inside so i dont want any unwanted high frequency oscillations.

As for the performance, wow. Dead quiet. Spooky. With both the class D and the chipamps, when i shorted their inputs to earth there was zero noise in the speakers. Even with my ear touching the tweeter in my coaxial speakers, i could hear nothing. Had to actually make sure the amp was still on!
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Old 14th July 2013, 01:11 PM   #3089
Bonsai is offline Bonsai  Taiwan
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The cat takes a nap.
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Old 14th July 2013, 02:39 PM   #3090
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Can't blame 'm, wouldn't mind keeping it company on the carpet.
(while I check the depth of the engraving with a sharp pointy nail)

The shirt is not my flavor, Mr Russell.
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