RMI-FC100, a single stage audio power amplifier - Page 12 - diyAudio
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Old 22nd November 2007, 01:56 PM   #111
roender is offline roender  Romania
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The WIMA MKS series has very low DA
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Old 22nd November 2007, 07:43 PM   #112
atiq19 is offline atiq19  United Kingdom
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Default Onsemi Thermal track Transistors

A comprehensive introduction of the output power transistors used in RMI-FC100 was blogged by John Broskie at his famous Blogg:

http://www.tubecad.com/2006/10/blog0084.htm
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Old 22nd November 2007, 09:02 PM   #113
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That design and also ONsemi example too, will NEVER work. It will be way out of thermal stability - to much overcompensated. The diode inside ThermalTrack BJT have TC -1.66mV/C.
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Old 29th November 2007, 04:51 PM   #114
roender is offline roender  Romania
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No one want to build it?
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Old 29th November 2007, 07:17 PM   #115
Triodas is offline Triodas  Lithuania
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Do you meen to build you amp?
I'm building it, but I need to redesign PCB design a little for my heatsinks. Don't worry, I'll change output devices location only.
Basic problem - lack of free time.
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Old 29th November 2007, 07:30 PM   #116
roender is offline roender  Romania
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Thank you !
Please be very carefully with output stage PCB redesign. I've spend more than 10 hours to do it
Please don't modify NFB takeoff point!
I'll wait for your feedback
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Old 29th November 2007, 07:52 PM   #117
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Roender,
I will definitly build it.
Do you have boards to sell? I do not etch myself, so this would be an additional push.
I recently build the symasym and like it a lot, but grading from a tube amp (up? down?) I could do with yet some sweetness *without* loosing definition and slam.

Rüdiger
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"I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog
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Old 29th November 2007, 08:14 PM   #118
spind is offline spind  Canada
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Quote:
Originally posted by roender
No one want to build it?

I'd like to.....but I'd need some guidance and boards. Are you planning on selling boards, or supplying pdf's that could be used for etching? What is the width of the boards plus output transistors (to check if my my heatsinks are OK). What are the transformer requirements; how much latitude is there with the supply voltages?

thanks,
Steve.
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Old 29th November 2007, 10:18 PM   #119
atiq19 is offline atiq19  United Kingdom
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Default pcb

I'll definately build it but I need a pair of pcb...
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Old 30th November 2007, 12:24 AM   #120
DRZ1 is offline DRZ1  Canada
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Quote:
Originally posted by roender
No one want to build it?
Shure, i am already on it ( pieces supply).

It's possible the pcb must be modified to fit my case. Roender do you have somethink you want to try? I have acces to a milling prototype machine for the PCB, it's more easy than etching it.
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