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Old 18th August 2010, 03:13 PM   #611
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Andy will be nice see a pic.... no problem for diy mess

Rob filament bias will be good , hope Andy will have time to test grid vs filament bias
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Old 18th August 2010, 03:39 PM   #612
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I'm not in a hurry to try grid bias - liking filament bias too much!

andy
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Old 18th August 2010, 03:42 PM   #613
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fine, filament bias will be!

pm for you
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Old 18th August 2010, 04:13 PM   #614
CFT is offline CFT  United States
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Good thinking Rod

That's so convenient! Thanks so much. And it's nice of you to publish the circuit too.

Will report once your regs are installed. Yeah, could try out 26/01A/112-A here soon
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Old 19th August 2010, 07:40 AM   #615
barossi is offline barossi  Germany
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Quote:
Originally Posted by Rod Coleman View Post
Here's a photo of the 26 (1.5V 1.05A) and 01A(5V 250mA) switchable filament driver. Just supply a raw dc of about 10V, and the board will heat 250mA filaments. Insert the PC-Motherboard Jumper link (in the centre), and the rated current rises to 1.05A for a 26. The extra large resistor soaks up the difference in voltages, instead of the transistor/heatsink - so these run cool in either mode.

In both modes, the 25-turn trimmer can accurately adjust filament current.

Special design for Cheung, these will be ready soon.
Hi Rod,

do you sell theses 26 boards?

KR Hauke
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Old 19th August 2010, 09:42 AM   #616
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Originally Posted by barossi View Post
Hi Rod,

do you sell theses 26 boards?

KR Hauke
hi Hauke,

Yes, I will have them to sell.

I must prepare drawings and instructions first. Also, Power supply design recommendations, and heatsink compatibility. Then - they will be available!
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Old 22nd August 2010, 10:09 AM   #617
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Originally Posted by Rod Coleman View Post
hi Hauke,

Yes, I will have them to sell.

I must prepare drawings and instructions first. Also, Power supply design recommendations, and heatsink compatibility. Then - they will be available!
Rod, Will you provide it as a kit? If so I am interested as well. It is difficult to find most of the components for your filement PSU here in my place.
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Old 22nd August 2010, 11:43 AM   #618
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Rod, Will you provide it as a kit? If so I am interested as well. It is difficult to find most of the components for your filement PSU here in my place.
Hi, Yes, Full kit will be available - just add a raw dc supply (trafo, rectifier, caps).

I prefer NOT to sell PCB-only. With a full kit, all the regulators should work just like the ones I have built, measured, and qualified. I'll PM some more info.
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Old 23rd August 2010, 04:53 AM   #619
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Originally Posted by Rod Coleman View Post
Hi, Yes, Full kit will be available - just add a raw dc supply (trafo, rectifier, caps).

I prefer NOT to sell PCB-only. With a full kit, all the regulators should work just like the ones I have built, measured, and qualified. I'll PM some more info.
Thanks Rod. great help.
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Old 23rd August 2010, 11:09 AM   #620
10y is offline 10y  Italy
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Quote:
Originally Posted by Rod Coleman View Post
Hi, Yes, Full kit will be available - just add a raw dc supply (trafo, rectifier, caps).

I prefer NOT to sell PCB-only. With a full kit, all the regulators should work just like the ones I have built, measured, and qualified. I'll PM some more info.
Hi Rod,
I,m interested in this filament reg kit when will be available.
Regards,
Anto
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