Building a symmetrical PSU B1 buffer

I wouldn't pretend that I have the energy to scrutinize your layout for connections (40C here). Just make sure it follows the schematics accurately.
But others may spot something or not.
Unfortunately super bright LEDS have a reputation for being noisier than normal ones which I can not confirm how much right now.
But surely I have never seen them in instrumentation as voltage references. Better use 3mm generic reds or greens in the 3+5 proven configuration.

Oh, I see that why no one use bright LED's...
I will change to original 3 + 5 that has proven configuration & check again if any error
maybe I'll give it a try in few days :cool:
I need buy some LEDs :)
 
I wouldn't pretend that I have the energy to scrutinize your layout for connections (40C here). Just make sure it follows the schematics accurately.
But others may spot something or not.
Unfortunately super bright LEDS have a reputation for being noisier than normal ones which I can not confirm how much right now.
But surely I have never seen them in instrumentation as voltage references. Better use 3mm generic reds or greens in the 3+5 proven configuration.

You are not the " Central Scrutinizer " ( Frank Zappa ) . :):):)
 
Hi everyone,
I've read all post here from page 1 to last one... need some days :D
Sunny Sunday... &
My handycraft PCB almost done ... :cool:
time to do some holes :D

I heard the buffer yeasterday and I am sorry to say I was very dissapointed. NICE but booring.
Hi Erlend, why it is NICE but make you disappointed?
Maybe any wrong setup, could you tell us the story

I'm going to made it, wish me like it :)
 

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Hi Udailey, thx...
I use permanent marker & hand drawing
it is my old way but you can try it, it's fun & work very well on me.
well I hope I can explain what I do correctly:

First I print the layout in a paper, than make a sandwich (paper on top the board)
with a little hammer hitting the steel needle I made a mark on the copper side, so dot's (a little hole made by the needle) everywhere on the copper plane. The little hole help a lot to guide you to drawing on the blank copper plane (also when drilling the pads make more accurate). Then I start to draw pads, all pads, all traces,... that quite exiting :)

Double or triple the layer with permanent marker for best result (I even add refill ink on new marker, they dried fast)
Error drawing, don't worry fix with it :
An externally hosted image should be here but it was not working when we last tested it.

"the magic pencil"
http://imageshack.us/a/img850/549/tusukjarum.jpg

That why it is called PCB arts-work :D

ps: I'm sorry for this off topic

Regards
 
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I guess it's ready to test

Good luck then. What kind of amplifier you project it to drive? Does it have at least 26dB of gain so a buffer will bring enough sound pressure level?
Hi Sir Salas,
sorry for very late reply, ...the amp is 30dB & another one 40dB...

Today I almost done it, I want to test the voltage first before put the missing 2SK170 pairs
because I can't get 1.8 volt LED's so I use 1.88 volt instead.
I hope nothing bad happening ;)

Regards
 

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DCB1 is Ready to Rock

Hi all...
I measured the voltage today & they are okay I guess :)
so I put the 2SK170 pairs & they are a bit warm :cool:

Hey, they are working :drink:
maybe tomorrow I will surprise with the sound

Warm Regards :)
 

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All Ok, thanks to all

Fine until now. Verify that the relay clicks to engage the audio outputs. You should measure some DC offset at the audio outputs. If it is lower than 5mV it is acceptable.
It all fine... :)
The relay clicks after few seconds, I just use BC550C for relay(no BC517 available here locally).
DC offset is below 5mV, the DC offset was about -1mV to -2mV.

Thank's for Salas for this wonderful circuit... :drink:
& Nelson Pass for the B1.

If anyone want to try it too I will give the layout :)
or should I post it here?

Regards
 
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It all fine... :)
The relay clicks after few seconds, I just use BC550C for relay(no BC517 available here locally).
DC offset is below 5mV, the DC offset was about -1mV to -2mV.

Thank's for Salas for this wonderful circuit... :drink:
& Nelson Pass for the B1.

If anyone want to try it too I will give the layout :)
or should I post it here?

Regards

Please post your layout :)
 
I like it :)

Congratulations. Did you put it in your audio system too?
Yes, I did it ...

When I use the amp with a bigger gain, the difference is not so much
(maybe amp was not built properly by me :D)
Then I use the PeeCeeBee ...
Now I could feel my work is more alive, what a surprise ...
If I said the amp is only 50W then they (some people here, nearby) will say I was lying because the sound is so loud.
Better bass, mid, & high,
when I use tone control in the amp,
I turn to max position(not the volume) & no "over control" like before.
The DCB1 make it straight like what it is should be
I like it so much, maybe I should make it again some day :cool:

Please note that I'm use cheap source that built in volume & remote control so I don't use 20k pot (but I already order it).
So next time I must use better setup :) & get ready for another better story

Please post your layout :)
Hi, RCruz only if you want to build it fast :D

Ok, I will post it tommorow cos the PC I use is being repaired
there will be bottom & top component placement, jpg & pdf :)