CCS for tubes/valves: PCBs - Page 3

Peter Menting · 28th January 2006, 12:08 PM

Sy; I would be interested in these as well.

Pete

pinkmouse · 28th January 2006, 12:08 PM

Quote:

Originally posted by burnedfingers
Are the boards going to have provisions for stand offs for mounting?

Oops! Correct picture attached!

jackinnj · 28th January 2006, 12:51 PM

If you haven't sent them out yet, PCBPro is now "allowing" cutouts again -- they will charge extra for "v-scoring" and if you can send them out soon they will cut the delivery time in half.

pinkmouse · 28th January 2006, 12:57 PM

They changed all their offers the day after we put in the order...

selfwilly · 28th January 2006, 01:46 PM

I am interested in some of these too.

charlie

1/137 · 28th January 2006, 02:29 PM

I'll take some too.

thanx
rt

moamps · 28th January 2006, 05:17 PM

Quote:

Originally posted by SY
[B]Since there's been a lot of interest lately in constant-current sources/sinks for use in tube amps and preamps, a few of us have been working behind the scenes to design a set of boards suitable for a wide variety of uses.

Hi,
I am wondering what are the current and voltage limits of this circuit (especially HV CCS) because you haven't provided for a small heatsink on the reg. transistor (also, the small trimmer will carry entire CCS current).
I have built a similar CCS for an LTP at 30mA and -B of 35V; heatsinking the regulating transistor was a must.

Regards,
Milan

navin · 28th January 2006, 05:21 PM

Quote:

Originally posted by JojoD818
navin,

you should get these boards for your upcoming amp in case you'll use ccs.

If only I haven't finished my ccs boards.

cheers

I was not sure if they'd ship to india.

SY · 28th January 2006, 05:30 PM

Milan, there is indeed space allocated in the HV versions for a heatsink. These probably won't be suitable for a 100mA CCS at high voltage, but for more normal applications (say 1-20mA), there's plenty of room to attach heat sinking to the TO202/220 transistor.

I hate running DC through wipers, too, but there's no way around that without either sacrificing adjustability or increasing complexity. Running current through the track is no problem.

yagas · 28th January 2006, 05:50 PM

A good idea might be a pcb for maida regulator or for a simple two transistor regulator with some instructions around including some profit as a donation. I think that it is not bad to expand your idea.

Mic

28th January 2006, 12:57 PM	#24
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	They changed all their offers the day after we put in the order... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

28th January 2006, 05:30 PM	#29
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Milan, there is indeed space allocated in the HV versions for a heatsink. These probably won't be suitable for a 100mA CCS at high voltage, but for more normal applications (say 1-20mA), there's plenty of room to attach heat sinking to the TO202/220 transistor. I hate running DC through wipers, too, but there's no way around that without either sacrificing adjustability or increasing complexity. Running current through the track is no problem. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

28th January 2006, 05:50 PM	#30
yagas diyAudio Member Join Date: Sep 2004 Location: Athens	A good idea might be a pcb for maida regulator or for a simple two transistor regulator with some instructions around including some profit as a donation. I think that it is not bad to expand your idea. Mic __________________ Mic

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28th January 2006, 12:08 PM	#21
Peter Menting diyAudio Member Join Date: Jul 2003 Location: Blackstone VA	Sy; I would be interested in these as well. Pete

28th January 2006, 12:51 PM	#23
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	If you haven't sent them out yet, PCBPro is now "allowing" cutouts again -- they will charge extra for "v-scoring" and if you can send them out soon they will cut the delivery time in half.

28th January 2006, 01:46 PM	#25
selfwilly diyAudio Member Join Date: Jan 2005 Location: new england	I am interested in some of these too. charlie

28th January 2006, 02:29 PM	#26
1/137 diyAudio Member Join Date: May 2002 Location: albuquerque nm	I'll take some too. thanx rt

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