A Heretical Unity Gain Line Stage part III - Page 11

Algar_emi · 4th February 2008, 11:50 PM

I prefer not to go in Europe for some PCB's, too far away for me. But if you like, I'll give you the Gerber and you can have your own made.

SY, I have a question about the servo cap C21. You spec 0.68uF, but I have in stock nice Wima 1.0uF. Would that do in this location instead of the 0.68uF specified?

No problem really SY, I'll make you a set. You worked a lot on this project and you shared the design. The least I can do is to reward you with a set of PCB at my cost.

Thanks...

woodturner-fran · 4th February 2008, 11:54 PM

I appreciate that Algar-emi. For some reason I had it in my head you were in Europe! Don't know why I thought that!!

The gerbers would be great - I haven't a clue right now what to do with them, but I'm sure I can find out.

Fran

SY · 5th February 2008, 12:25 AM

That's too small and will affect the bass. 0u47 would work.

Algar_emi · 5th February 2008, 11:02 AM

I thought that 1.0uF was bigger than 0.68uF

. Isn't better than 0.47uF?

SY · 5th February 2008, 11:18 AM

Grrrrrr, I need to have coffee first- I read "0.1uF." Sorry. Yes, your caps will work.

Algar_emi · 5th February 2008, 02:47 PM

Good to know that I didn't forget all my RC corner freq stuff

Thanks for the info.

Algar_emi · 5th February 2008, 11:59 PM

Here the first version of the external supply PCB, based on my parts list. It is single side so the HV traces are hidden as far as possible. It has 3 wire jumpers.

It includes the discrete EMI filter, ground loop breaker R & C, star ground, HV switching relay, rectifier diode snubber caps, bypass film caps and two leds, HV ON and PWR ON driving circuits.

Algar_emi · 13th February 2008, 07:08 PM

Look what showed up in the mail today

. Still a few days, and I'll have completed the preamp supplies PCB.

Algar_emi · 16th February 2008, 01:35 PM

Here the preamp regulated supplies section. There is star gnd, regulator Kelvin points are directly connected to the outputs gnd to reduce supplies noise. The two HV sections are separate for Left and Right. The external supply HV relay trigger FET is also on this PCB. I choose to mount the biggest 4.7uF output caps on this PCB and the smaller 4.7uF cap directly a the tube pin on the upcoming preamp PCB. It is still a one layer PCB with a few jumpers. PCB dimensions are 4" X 8", with each section about 4"X4".

woodturner-fran · 16th February 2008, 01:47 PM

Astounding - what great work Algar.

well done and thanks.

Fran

5th February 2008, 12:25 AM	#103
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	That's too small and will affect the bass. 0u47 would work. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

5th February 2008, 11:18 AM	#105
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Grrrrrr, I need to have coffee first- I read "0.1uF." Sorry. Yes, your caps will work. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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4th February 2008, 11:50 PM	#101
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	I prefer not to go in Europe for some PCB's, too far away for me. But if you like, I'll give you the Gerber and you can have your own made. SY, I have a question about the servo cap C21. You spec 0.68uF, but I have in stock nice Wima 1.0uF. Would that do in this location instead of the 0.68uF specified? No problem really SY, I'll make you a set. You worked a lot on this project and you shared the design. The least I can do is to reward you with a set of PCB at my cost. Thanks...

4th February 2008, 11:54 PM	#102
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	I appreciate that Algar-emi. For some reason I had it in my head you were in Europe! Don't know why I thought that!! The gerbers would be great - I haven't a clue right now what to do with them, but I'm sure I can find out. Fran

5th February 2008, 11:02 AM	#104
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	I thought that 1.0uF was bigger than 0.68uF . Isn't better than 0.47uF?

5th February 2008, 02:47 PM	#106
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	Good to know that I didn't forget all my RC corner freq stuff Thanks for the info.

16th February 2008, 01:47 PM	#110
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Astounding - what great work Algar. well done and thanks. Fran

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