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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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PostPosted: 31 Jul 2012, 08:43 
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Joined: 10 Jul 2011, 04:45
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Location: Banda Aceh, Indonesia
Hi Everybody,

I'm looking for best discrete regulator for my PCM1793. Does any one here has an experience to built its ? I look for 5 Vdc and 3.3 Vdc. Many thanks before.

Arie

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Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....

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Arie


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PostPosted: 30 Nov 2013, 02:06 
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Location: Banda Aceh, Indonesia
Hello All,

I plan to build low drop regulator for my DAC or my preamp with maximum load up to 500mA. After several reading about voltage reference, I'd rather prefer to using Infrared LED due to less noise (0.22uV) at maximum current (@20ma).

Please check this threath .... http://www.diyaudio.com/forums/parts/35821-some-noise-measurements-leds-zener-diodes.html

So this is my schematic on electronic simulator. Seems working well. The cct can be working with 10 - 22 Vin to produce 5.1 Vout at 500mA.
Attachment:
LED - LDO 5V Regulator.JPG

The firts step is CCs (base on Rod Elliot schematic) to feed current about 20mA to five IR Led as voltage reference. The second is regulator (with BD139) with 5.87 Vref.

So because I'm really newbie :D and goes to crazy :bawling: about all audio things I need somebody to help me to make corrections on my cct.

Many thanks before... :up:


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Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....

Salam,
Arie


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PostPosted: 30 Nov 2013, 20:34 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, My thoughts are ...why do it the hard way. Use a pair of LM317s and set them for what ever you want. A modest cap up front of the pair and some polys and electrolytics on the output side. The supposed noise they make is typically orders of magnitude lower than what ever they are hooked up to. A keep it simple design. If you need lower current use one of the low power variants or a LR8 type.

Good listening
Bruce

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PostPosted: 30 Nov 2013, 22:06 
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Location: Banda Aceh, Indonesia
Hi Bruce ... Thanks for comments.

Since I know a little about electronic things... seems I goes to crazy... :P even I'm really newbie....
I think its same like a cooking.... We can't judge some ingredients of food before we can try to cook and eat it. :D And its really fun for me...

I read this article http://www.tnt-audio.com/clinica/regulators_noise3_e.html about listening test for several discrete voltage regulator. And the conclusion (like your point) .... the simple is better. Zener + Emitter Follower CCt is very low noise.

So, I think I can replacing Zener with LED due to more less noise. My CCt actually base on that. Just replacing Zener with IR LED and add CCS to limitting 20 mA for 5 string IR LED (Vf. 1.17).

What do you think Bruce ?

Many thanks for your support...

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Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....

Salam,
Arie


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PostPosted: 11 Dec 2013, 01:33 
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Joined: 05 Nov 2010, 21:07
Posts: 658
Location: South East US - Tennessee
redsky wrote:
... I think I can replacing Zener with LED due to more less noise...


Salam, Arie.
Firstly, true, an LED is less noisy than a zener, however, not by much. Additionally, LEDs inherently do inject high frequency noise that can "color" your audio product. This can be handled with a small capacitor of, say, 47nF to 100nF. But, in the end, I'm afraid I must agree with Bruce, simpler is better. You can't get much more simple than the LM117/317, LR8 or similar type regulator devices. They have exceptionally low noise figure and you only need 2 or 3 components TOTAL. The LM117T/317T can handle 500mA easily as it is designed to handle up to 1.5A (with appropriate thermal support).

Cheers!

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The key to a successful build is to keep the smoke IN the circuit.
-Les

Science without religion is lame, religion without science is blind. - Albert Einstien
_________________________________
LM380 Bridged Guitar Amp, Oatley K301 Phono Pre-amp, Oatley K272 Headphone Amp, Tube proto-board
Current project: 6V6 "pseudo Champ" prototype
Still to come (On hold): 6CG7/12AX7 Guitar amp (modified FireFly)


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PostPosted: 12 Dec 2013, 11:20 
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Joined: 10 Jul 2011, 04:45
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Location: Banda Aceh, Indonesia
Les wrote:
But, in the end, I'm afraid I must agree with Bruce, simpler is better.


Hi Les thanks for comments.

I do believe too... the simpler is better. :D . Now, how about to simplify my CCT ...? :idea: I think I still prefer to using LED as voltage reference... Can you help me... ?

Terima kasih banyak....

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Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....

Salam,
Arie


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