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Old 9th July 2010, 01:36 AM   #1681
udailey is offline udailey  United States
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The Lightspeed is not sensitive to ambient light. I have had mine playing with the top cover off for years. Several different iterations as well. Once in a great while an LDR will not be sealed well. This LDR should just be thrown out or somehow sealed with some goop.
Uriah
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Old 9th July 2010, 06:23 AM   #1682
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Salas

why are you use 470r as gate stopers
Isn't It too high
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Old 9th July 2010, 06:44 AM   #1683
Salas is offline Salas  Greece
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Where, in the regs? That has to do with how I wanted the closed loop gain graph of the dc error amp and what kind of phase margin I got, then with subjective evaluation on the point to point proto. There is no rule of thumb 'small' or 'big' for those.
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Old 9th July 2010, 09:41 AM   #1684
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kp93300 - I'm using red LED's, and get ~4.85V from the circuit. As Uriah said, these LDR's are sealed. I've not noticed any problems with light from the PS LED's.
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Old 9th July 2010, 09:58 AM   #1685
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Quote:
Originally Posted by kp93300 View Post
Hi William,
What is the colour LED that you are using ?
I understand that the Lightspeed is sensitive to ambient light . Do you find this a problem with the LEd next to the silonix ?
regards
kp93300
Why are you assuming that? The Silonex devices are potted and isolated from the exterior ambient light. Though I don't know what tolerance it has. I mean, in extreme light conditions it may be affected. But not at all in a closed enclosure.

I don't know if a shunt regulated for the LDRs will give any improvement. After all, it is driving a led. Could be a good experiment to hook up a regulator and checking with a scope if the resistor varies with ripple or whatever
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Old 9th July 2010, 04:10 PM   #1686
udailey is offline udailey  United States
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I know its not a Lightspeed thread so maybe we shouldnt be jamming this one up with LDR talk. Why dont you steal power from the incredible regulator thats in the same box???
Yes the quality of the power you feed it is the largest improvement you can make.
Uriah
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Old 9th July 2010, 10:57 PM   #1687
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Just to say that finally it's up and running!

In the 'wild' but it's working!

The 10 Ohm resistors are temporary while Mills arrives...

Also the pot (a lightspeed will mount there) and the 100 uF caps are temporary, I'll mount sockets to swap different caps.

In the attached photo is near the 'wild' MyRef.
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Old 9th July 2010, 11:04 PM   #1688
Salas is offline Salas  Greece
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Old 10th July 2010, 12:46 AM   #1689
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Another photo then...

the dissy temperature is 63C (room is at 30C...) and it sounds great from the start

AC rails are at 14.4V and the 30VA is warm (35C)
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Last edited by ClaveFremen; 10th July 2010 at 12:50 AM.
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Old 10th July 2010, 01:13 AM   #1690
Salas is offline Salas  Greece
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You use too small sinks for 10R set resistors, luckily those Mosfets are war dogs.
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