John Curl's Blowtorch preamplifier part II - Page 6

Bonsai · 1st July 2009, 02:17 PM

Avoid M-Audio

I recognize this statement. Absolute crap for measurements.

PMA · 1st July 2009, 02:58 PM

Okay, message understood. Back to Blowtorch preamp - circuitry, parts and finish.

nicoch58 · 1st July 2009, 03:55 PM

HI

If I'm not wrong ,not too light on the Blowtorch psu....

john curl · 1st July 2009, 04:11 PM

The power supply is the biggest part of the active circuitry for the BLOWTORCH.
It is composed of 3 passive stages, then 3 active stages of regulation and noise reduction, on each channel and each supply voltage, before reaching the actual gain stage that amplifies the music. The gain stage is about 2 square inches (rough estimate) for each channel. The rest is servos, and power supply.

janneman · 1st July 2009, 04:19 PM

Quote:

Originally posted by john curl
The power supply is the biggest part of the active circuitry for the BLOWTORCH.
It is composed of 3 passive stages, then 3 active stages of regulation and noise reduction, on each channel and each supply voltage, before reaching the actual gain stage that amplifies the music. The gain stage is about 2 square inches (rough estimate) for each channel. The rest is servos, and power supply.

I like that concept. Always reminds me of a super sportsman. He is the one to perform, but he has a coach, a hapnic advisor, a medical assistent, a stress manager, whatever. The amplifing stage is the supersportsman. The rest is there to make him perform his best.

Are these regulator stages series or shunt?

Jan Didden

PMA · 1st July 2009, 04:22 PM

I would guess series - shunt - passive (aka cap multiplier)

nicoch58 · 1st July 2009, 04:50 PM

HI
my Erno phono have discrete series reg, can be usefull add a shunt before ?

janneman · 1st July 2009, 04:59 PM

Quote:

Originally posted by nicoch46
HI
my Erno phono have discrete series reg, can be usefull add a shunt before ?

No, after! The great advantage of a shunt is that it lets you localize the return current, rather than running it back through the ground wire to the supply input, with the risk that it contaminates the signal ground.

Jan Didden

nicoch58 · 1st July 2009, 05:03 PM

thanks Jan

I see a lot to learning on Blowtorch psu

janneman · 1st July 2009, 05:35 PM

Quote:

Originally posted by nicoch46
thanks Jan

I see a lot to learning on Blowtorch psu

Of course I wasn't talking on the Blowtorch PSU. I have no idea how that is configured (well, a tiny bit from John's post).

Jan Didden

1st July 2009, 02:17 PM	#51
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Avoid M-Audio I recognize this statement. Absolute crap for measurements. __________________ bonsai http://www.hifisonix.com/

1st July 2009, 03:55 PM	#53
nicoch58 diyAudio Member Join Date: Oct 2004	HI If I'm not wrong ,not too light on the Blowtorch psu.... __________________ Sic58

1st July 2009, 04:50 PM	#57
nicoch58 diyAudio Member Join Date: Oct 2004	HI my Erno phono have discrete series reg, can be usefull add a shunt before ? __________________ Sic58

1st July 2009, 05:03 PM	#59
nicoch58 diyAudio Member Join Date: Oct 2004	thanks Jan I see a lot to learning on Blowtorch psu __________________ Sic58

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1st July 2009, 02:58 PM	#52
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Okay, message understood. Back to Blowtorch preamp - circuitry, parts and finish.

1st July 2009, 04:11 PM	#54
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	The power supply is the biggest part of the active circuitry for the BLOWTORCH. It is composed of 3 passive stages, then 3 active stages of regulation and noise reduction, on each channel and each supply voltage, before reaching the actual gain stage that amplifies the music. The gain stage is about 2 square inches (rough estimate) for each channel. The rest is servos, and power supply.

1st July 2009, 04:22 PM	#56
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	I would guess series - shunt - passive (aka cap multiplier)

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