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Old 11th December 2011, 09:34 AM   #831
Salas is offline Salas  Greece
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700-750mA will be hot-rod most of the time and will work high rev. Low impedance and best subjectively. Not too many Volt, you will sink it well, and will be A OK.
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Old 11th December 2011, 09:39 AM   #832
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Cool! (unlike the case that'll be used to heatsink this baby.. )
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Old 11th December 2011, 09:42 AM   #833
Salas is offline Salas  Greece
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See the real current you will get with your individual components tolerances and trim the resistor value a bit up if in excess. I gave you ballpark value as always with Mosfets and LEDs.
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Old 11th December 2011, 02:41 PM   #834
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Quote:
Originally Posted by Tea-Bag View Post
20ma ones, red 1.8fv, green 1.9fv or yellow.
thank you

are that one good http://www.farnell.com/datasheets/79375.pdf
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Old 11th December 2011, 02:50 PM   #835
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It Is orange ?
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Old 11th December 2011, 03:00 PM   #836
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Quote:
Originally Posted by samoloko View Post
It Is orange ?
The one's I distribute are red, a little lower forward voltage, green, a little higher, and sometimes yellow - a little in between. Orange looks to fit into that ballpark as well. With the newer boards with 4 LED CCS, just one color (red) will do IMO.
That's a strange looking LED, kinda like a RCA plug
I consider multi-comp a good brand.
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Old 14th December 2011, 08:04 PM   #837
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Voltage reg now powering the BA-2 front end. Same set up as for the BA-3 although the BA-2 draws less current.

Because there is only 4-5cm between the reg and the front ends I have not used the twisted wire output configuration. There isn't room. So I have joined the two 0V on each rail and each of these is connected to the star ground of the main power supply which powers the output stage. +ve and -ve terminals on each rail are also connected on the reg board and then each is connected with a single wire to the -ve and +v terminals of the front end.
The BA-2 has up to now been running without a reg so tonight was the first time I heard it with the regulator in place. I will update you when I have had a chance to listen to some familiar pieces of music.
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Old 15th December 2011, 01:19 AM   #838
Salas is offline Salas  Greece
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Fine, thanks.
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Old 24th December 2011, 02:01 PM   #839
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I just made the first test with my bib psu.

The goal is to get out 45VDC to drive my jfet phono pre.

I used 10R for R101, 6k8 R103, 5k poti and 560R test load.

The input was at 36.6VAC.

Before R101 46.7VDC, after R101 44,6VDC and on the output max. 39.5VDC.

Any hints to reach higher output voltage?

Merry christmas
Franz
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Old 24th December 2011, 02:09 PM   #840
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... I forgot to mention:

I used a test tranny, marked as 32VAC but measured 36.6VAC.

But I will try a "real" 36VAC tranny asap.

Franz
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