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Old 26th June 2010, 02:41 PM   #1591
Tea-Bag is offline Tea-Bag  United States
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It sure will. You can use 3v LED's instead.

Mouser pn MV5352

The typical red is 1.8v x 5 = 9v

I am not sure if they will be too noisy. Other's may comment on that. I know 12v one's Salas told me are risky.
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Old 26th June 2010, 03:09 PM   #1592
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out of curiousity on 15vdc with salas's shunt reg, possible? anyone can guide me in this? if possible with some calculation too, so that i can learn from you guys
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Old 26th June 2010, 03:59 PM   #1593
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there're several designs up to 60V out and even HV schems up to 300V out for tube freaks.
The simplistic Salas low voltage shunt regulator
Simplistic Mosfet HV Shunt Regs
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Old 26th June 2010, 07:28 PM   #1594
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Hello,

I'm in trouble with LED matching...

I must have missed something.

I've bought LEDs in v4.3 BOM (Mouser 593-VAOL-3HCE4), and measured forward voltage of each LED fed by a 9V battery and a 1K2 resistor in series (right, isn't it?).

Measures varies from 1,901V to 1,910V, in spec according to datasheet (mav 2V froward voltage) but far from the typical 1,8V expected value.

So no way of getting 9V or 5,4V (9,53V and 5,70 are best match)

Help!
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Old 26th June 2010, 07:37 PM   #1595
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It will be OK. The Vout values will still track with positive somewhat higher as expected and in sweet spot range. Just find 2 similar strings.
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Old 26th June 2010, 07:38 PM   #1596
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I had the same results when matching my leds (same part number). You will get a few more tens of a volt in the supply rails. Nothing to worry about.
Other people in the thread reported to have the same values with the same part number.

Regards,
Regi
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Old 26th June 2010, 07:52 PM   #1597
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I have red LED from different suppliers that vary between 1.55V and 1.95V.
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Old 26th June 2010, 08:09 PM   #1598
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Quote:
Originally Posted by Salas View Post
It will be OK. The Vout values will still track with positive somewhat higher as expected and in sweet spot range. Just find 2 similar strings.
Quote:
Originally Posted by regiregi22 View Post
I had the same results when matching my leds (same part number). You will get a few more tens of a volt in the supply rails. Nothing to worry about.
Other people in the thread reported to have the same values with the same part number.
Thanks everyone, so it's OK

Powered ON soldering iron again...

Quote:
Originally Posted by AndrewT View Post
I have red LED from different suppliers that vary between 1.55V and 1.95V.
Wow! So I suppose I've been lucky...
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Old 26th June 2010, 08:20 PM   #1599
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Like mentioned before, it's more important to have two strings have similiar total values than the trying to get lower one's. I am using the yellow one's, and they sit @ 10v.
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Old 26th June 2010, 10:26 PM   #1600
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Well, soldering iron now is powered OFF...

Haargh, my R-Core transformer is still shipping from France...

I've implemented directly last mods, I think...

Vref caps are Wima MKS2XL 2,2uF, the value is ok?

Is 10 Ohm 5W the right value to replace the 68 Ohm couple?

Thanks in advance
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