LED values? [message #30349] |
Tue, 01 February 2005 20:35 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
colinhester
Messages: 1349 Registered: May 2009 Location: NE Arkansas
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Illuminati (3rd Degree) |
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I remember somewhere that the LEDs are supposed to be around 20mA apiece. I do not remember if there is was a specified voltage. Can anyone refresh my memory?
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Red lead [message #30351 is a reply to message #30350] |
Wed, 02 February 2005 05:55 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!, The red seem to be the quietest. It could be done with a 4V single, perhpas green or blue, but I have found even orange ones to contribute some noise. Perhaps it was just the Radio-Shack ones I tried, but...The 20 mA red, standard red, are the ones you want. The internal resistance of the specialty red ones is not optimum for Audio use. regards, Douglas
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interesting... [message #30358 is a reply to message #30355] |
Wed, 02 February 2005 07:42 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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I have a feeling that a small string of Schottky would be a cool idea. Forward biased at ~.4V each. We'd need more than two, but it would offer a far finer adjustment of the bias voltage. I suspect that the Schotky would be quieterin fwd bias than a Si one would be. Nice suggestion I must say. If I didn't need a 20-30 of them in the new one ( instead of 6 red LED's ), I'e be solderig up a string. regards, Douglas
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Re: LED values? [message #30363 is a reply to message #30349] |
Wed, 02 February 2005 13:34 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
cheetah
Messages: 70 Registered: May 2009
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Viscount |
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For the adventurous, a 6BE3 TV damping diode @ 15mA current should give approx 3-3.5 V bias voltage. Saw this done this way on the Axiom Amp. Haven't tried it, but it sure looks interesting. Joe
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Re: LED values? [message #30371 is a reply to message #30350] |
Wed, 02 February 2005 16:13 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) |
colinhester
Messages: 1349 Registered: May 2009 Location: NE Arkansas
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Illuminati (3rd Degree) |
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The red LED at RS were rated between 2.1 and 2.3V, and ranged anywhere from 15 to 60mA current draw....Colin
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