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Old 30th October 2012, 05:37 PM   #141
pdul is offline pdul  Denmark
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A lot of good possibilities, Thank you guys
I must admit that i fell in love with the Lumberg solution, when i saw that it is good for 5A. Very compact too
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Old 30th October 2012, 05:56 PM   #142
pdul is offline pdul  Denmark
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What is the minimum DC voltage, I can feed into the shuntreg on paradise?
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Old 30th October 2012, 05:58 PM   #143
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I use the Lumbergs too, they have a convenient locking system.
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Old 30th October 2012, 06:00 PM   #144
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I think the absolute minimum is 25V. When the Leds do not glow you have too little.

Last edited by Joachim Gerhard; 30th October 2012 at 06:03 PM.
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Old 30th October 2012, 06:01 PM   #145
pdul is offline pdul  Denmark
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Thanks.
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Old 30th October 2012, 08:08 PM   #146
pdul is offline pdul  Denmark
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I just salvaged a nice transformer from a JVC home theatre, and measured it to 18,4-18,4v unloaded. with a simple prereg. and both paradise boards connected, i measure +/-23v and all the leds are glowing. Best of all the heatsinks cant be used as a stowe anymore, temp. around 40 degrees Celsius.
So how low can we go.
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Old 30th October 2012, 08:13 PM   #147
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When it works, it works. Maybe you got a new low voltage record.
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Old 30th October 2012, 08:28 PM   #148
pdul is offline pdul  Denmark
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Backside is that i used it to keep my coffeecup warm while soldering, so now i have to remember to drink it faster
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Old 31st October 2012, 09:14 AM   #149
hesener is offline hesener  Germany
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Leaving 5V (23V-18V) for the current sources is a low number, I think it should not go below that. While they will still be working, the noise isolation they provide will degrade a little bit, due to the VAS parameter of the bipolars increasing at low VCE - not dramatic though. Maybe Frans has looked into this, any comments?
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Old 31st October 2012, 09:20 AM   #150
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btw
where is Frans ?
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