The Poor Serbian Man's Optical Attenuator - Page 2

23rd October 2010, 07:00 AM
Zen Mod and Spavleski diyAudio Member Join Date: Oct 2010	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.

23rd October 2010

Manu

diyAudio Member

Dear Sascha & Slobo ...

Great article ...
And a real pleasure to read

Sincerely admirative

Manu

Manu, masked agent of entropy & ZMs Čiko

24th October 2010

snusovic

diyAudio Member

I'm very impressed by the work you have done!

Bravo Majstori!

Poz iz Svedske

24th October 2010

ronwande

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

diyAudio Member

Fantastic.

Esteban Bikić

13th November 2010

Atilla

diyAudio Member

Time to GB a few boards then

14th November 2010

Variac

diyAudio Editor

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

"The geek shall inherit the earth"
Burning Amp thread here on diyAudio

23rd November 2010

wabun

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

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.

PSMLS CookBook by ZM

25th November 2010

wabun

diyAudio Member

thanks.. understood now

25th November 2010

spavleski

diyAudio Member

Glad to hear. Cheers.

PSMLS CookBook by ZM

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

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