The Mini-A - Page 3

GRollins · 8th February 2002, 06:58 PM

Vince,
I'd estimate a final rail in the vicinity of 18 or 19 volts. This is actually close to where I was running my Mini-A at full power (I was holding it down to 15V rails with a Variac).
The transformer will be warm to the touch, but not too bad. What you'll need to watch is your device dissipation, which will be on the order of 38W/device. Make sure you've got plenty of heatsinking if you're going to run them that hot.

Grey

vdi_nenna · 8th February 2002, 07:12 PM

Cool! ...I hope.

Koy · 10th February 2002, 09:31 AM

Aha. Without C3 as I see you turned the dynamic current source to ordinary one - to the SE. Does it really change the sound to more detailed?

vdi_nenna · 21st March 2002, 11:52 PM

Grey, one more question. I reread all your posts here and I was just wondering exactly what you meant. By increasing R11 to 220k ohms, do I still need to increase R18 and 19 to .33 ohms?

It won't hurt to buy all them right now, but when I go to put this thing together, I want to use the correct values for R11, R18 and R19.

Thanks for putting this together. Let you know how it turns out.\
Sorry to be so think headed about this!

Vince

hifi · 22nd March 2002, 07:26 AM

can the mini A live from +-6V i just found some nice 150-200A batteries (im not shure what they are called in english lead based but you dont need to add any water to them) they way like a ton each..but i only got to possibly 3pcs

/micke

mozfet · 22nd March 2002, 03:15 PM

Grey Yoo Da Mann! really nice circuit, a lot of these babies will be built, any chance of the pcb layout being made available for us idle/incapable/software-less types.

Mozfet.

goodstuff57@hotmail.com

carpenter · 4th April 2002, 02:19 AM

Hi Grey,

I have a tri-amp sound system that's balanced. This mini-fellow would come in handy on my hf horns. How would you go about creating a balanced input on this little marvel?

A drawing's worth a thousand words.

John Inlow

Koy · 4th April 2002, 06:11 AM

Grey, I have one question.
What is the point of Q5? Current source? Why??Thanks.

planet10 · 4th April 2002, 06:11 AM

Grey,

It's like you were reading my mind... i've been re-reading nelson's AE Zen article, and was wondering about a smaller version -- 5-10W. The spare 225VA 18-0-18 toroid with a choke input looks like a good candidate for PS :^)

Thanx.

dave

vdi_nenna · 4th April 2002, 02:33 PM

John,

HiFi added a balanced front end on page 1 of this thread.

10th February 2002, 09:31 AM	#23
Koy diyAudio Member Join Date: Jan 2001 Location: Zlin	Re: Compensation Cap Aha. Without C3 as I see you turned the dynamic current source to ordinary one - to the SE. Does it really change the sound to more detailed?

21st March 2002, 11:52 PM	#24
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	One more question before I order!!! Grey, one more question. I reread all your posts here and I was just wondering exactly what you meant. By increasing R11 to 220k ohms, do I still need to increase R18 and 19 to .33 ohms? It won't hurt to buy all them right now, but when I go to put this thing together, I want to use the correct values for R11, R18 and R19. Thanks for putting this together. Let you know how it turns out.\ Sorry to be so think headed about this! Vince

22nd March 2002, 03:15 PM	#26
mozfet diyAudio Member Join Date: Mar 2002	PCB Layout? Grey Yoo Da Mann! really nice circuit, a lot of these babies will be built, any chance of the pcb layout being made available for us idle/incapable/software-less types. Mozfet. goodstuff57@hotmail.com

4th April 2002, 02:19 AM	#27
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	balanced inputs? Hi Grey, I have a tri-amp sound system that's balanced. This mini-fellow would come in handy on my hf horns. How would you go about creating a balanced input on this little marvel? A drawing's worth a thousand words. John Inlow

4th April 2002, 06:11 AM	#29
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Re: Hot dog! Grey, It's like you were reading my mind... i've been re-reading nelson's AE Zen article, and was wondering about a smaller version -- 5-10W. The spare 225VA 18-0-18 toroid with a choke input looks like a good candidate for PS :^) Thanx. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA


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8th February 2002, 06:58 PM	#21
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Vince, I'd estimate a final rail in the vicinity of 18 or 19 volts. This is actually close to where I was running my Mini-A at full power (I was holding it down to 15V rails with a Variac). The transformer will be warm to the touch, but not too bad. What you'll need to watch is your device dissipation, which will be on the order of 38W/device. Make sure you've got plenty of heatsinking if you're going to run them that hot. Grey

8th February 2002, 07:12 PM	#22
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Cool! ...I hope.

22nd March 2002, 07:26 AM	#25
hifi diyAudio Member Join Date: Mar 2001 Location: sweden	can the mini A live from +-6V i just found some nice 150-200A batteries (im not shure what they are called in english lead based but you dont need to add any water to them) they way like a ton each..but i only got to possibly 3pcs /micke

4th April 2002, 02:33 PM	#30
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Balanced John, HiFi added a balanced front end on page 1 of this thread.

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