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Old 23rd October 2010, 07:00 AM  
Zen Mod and Spavleski is offline Zen Mod and Spavleski
diyAudio Member
Join Date: Oct 2010
Default The Poor Serbian Man's Optical Attenuator

A gadget made by Spavleski & Zen Mod
Article scribed by Zen Mod

Click here to read the entire article

Last edited by Variac; 2nd April 2011 at 12:15 AM.
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23rd October 2010
Manu's Avatar
diyAudio Member
Dear Sascha & Slobo ...

Great article ...
And a real pleasure to read

Sincerely admirative

Manu, masked agent of entropy & ZMs Čiko
24th October 2010
diyAudio Member
I'm very impressed by the work you have done!

Bravo Majstori!

Poz iz Svedske
24th October 2010
diyAudio Member
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.
25th October 2010
dady's Avatar
diyAudio Member
Esteban Bikic
13th November 2010
diyAudio Member
Time to GB a few boards then
14th November 2010
Variac's Avatar
diyAudio Editor
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
23rd November 2010
diyAudio Member
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
23rd November 2010
spavleski's Avatar
diyAudio Member
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.
25th November 2010
diyAudio Member
thanks.. understood now
25th November 2010
spavleski's Avatar
diyAudio Member
Glad to hear. Cheers.


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