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The Poor Serbian Man's Optical Attenuator
The Poor Serbian Man's Optical Attenuator
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Old 23rd October 2010, 09:52 PM   #11
Manu is offline Manu  Europe
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Dear Sascha & Slobo ...




Great article ...
And a real pleasure to read

Sincerely admirative

Manu
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Old 24th October 2010, 05:37 PM   #12
snusovic is offline snusovic  Sweden
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I'm very impressed by the work you have done!

Bravo Majstori!

Poz iz Svedske
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Old 24th October 2010, 07:15 PM   #13
ronwande is offline ronwande  United States
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Default Optical Attenuator Distortion

Neat idea. I have some of these devices so I breadboarded two in series. Enough current through the LEDs (also in series) to make the total resistance 5K more or less. Tap to ground just about 2.5K as expected. Applied 2 volts signal to the pot and measured distortion at the tap. 0.06% distortion at 1 KHz. It is largely third harmonic. This is about ten times the distortion through my home built system from CD all the way through to speaker terminals!

I'll stick with plain old pots, thank you.
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Old 25th October 2010, 12:41 PM   #14
dady is offline dady  Croatia
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Fantastic.
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Old 13th November 2010, 03:14 PM   #15
Atilla is offline Atilla  Norway
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Time to GB a few boards then
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Old 14th November 2010, 03:57 AM   #16
Variac is offline Variac  Costa Rica
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The Poor Serbian Man's Optical Attenuator
Quote:
kudos for at least triple grammar and spell check work ; you boyz are the best

Toughest editing job so far, but the real ZM still shines through I think
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Old 23rd November 2010, 01:12 AM   #17
wabun is offline wabun  United States
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The BDX53C transistor at power supply section heats up, case worst in split supply whereby it gets heated up tremendously even thru I put up heatsink. CHecked the circuit, all connection properly soldered. Can any one check and share the experience? Thanks
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Old 23rd November 2010, 07:16 PM   #18
spavleski is offline spavleski  Serbia
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The Poor Serbian Man's Optical Attenuator The Poor Serbian Man's Optical Attenuator
Shunt supply will put all the current through the BDX53, if there is no load connected (that's the worst case for shunt regulator if we're talking about heating). If there is a load, part of the current will flow through it, and part through BDX53.
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Old 25th November 2010, 12:01 AM   #19
wabun is offline wabun  United States
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thanks.. understood now
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Old 25th November 2010, 05:13 AM   #20
spavleski is offline spavleski  Serbia
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The Poor Serbian Man's Optical Attenuator The Poor Serbian Man's Optical Attenuator
Glad to hear. Cheers.
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