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Old 1st May 2009, 03:57 PM   #1591
crt is offline crt  Indonesia
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yes, because this buffer is simple enough for newbie like me.
it take around 3 hours to build from scratch.

Power UP --> NO PROBLEM --> listen some my favorite song (ROCK LINE!)

Result is super amazing, for super cheap buffer.
it take less than US$ 30 for all the parts + PCB + Trasformator.

i will build a casing for this buffer next time i go back to home in Celebes (South East Sulawesi).
because right now i'm still study in Surabaya (East Java).
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Old 2nd May 2009, 05:45 PM   #1592
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Default Regulator

I'm building my B1 on a wimpy patterned vector board (Vector 4614), and after laying out all the parts on it, I seem to have some space left. So I thought I'd try to put a simple voltage regulator on it.

I settled on the Sulzer regulator because the part count is low and it should be able to fit, but I'm not completely sure if I can get it to work. Two questions:
1) Is there a good replacement available for the 2n3053 originally used in this application?

2) Newer regulators since then seem to use the D44H11, but this part is very high current gain. Since the B1 only draws 20mA, and the hfe of the D44H11 is 60 or more, is it appropriate?

For reference, the schematic I'm looking at is here:
http://www.alw.audio.dsl.pipex.com/sulzer_circuit.htm

thanks in advance,
-j
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Old 3rd May 2009, 12:53 AM   #1593
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Quote:
Originally posted by crt

I use the original article about the B-1 buffer. Can I remove the caps ?
salas version ?
No you can't with the original schematic but you can with Salas' version. Please see post #466.
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Old 3rd May 2009, 03:42 PM   #1594
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Quote:
Originally posted by jean-paul


No you can't with the original schematic but you can with Salas' version. Please see post #466.
Thank's jean-paul

interesting one! more simple with no input/output caps, but have a relay's. for what ?
can i remove this relays if i want to build this version ?
is there worth to build this salas version ? different sound ?

Many Thank's
La Ode
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Old 3rd May 2009, 03:48 PM   #1595
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I put the relay there just to avoid possibilities of thumping sounds if turning on the B1 while the main amp is on. Not essential, you can skip it, but do the classic procedure of turning on main amp last, turning it off first. The sound will miss any coupling capacitors signatures, so that will be its difference from a standard B1.
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Old 3rd May 2009, 04:01 PM   #1596
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Quote:
Originally posted by Salas
I put the relay there just to avoid possibilities of thumping sounds if turning on the B1 while the main amp is on. Not essential, you can skip it, but do the classic procedure of turning on main amp last, turning it off first. The sound will miss any coupling capacitors signatures, so that will be its difference from a standard B1.
OK Salas, Thank's
Look's like i will build this one too.
but i will skip the relays, because my amp have a delay time potector too. and will make this buffer more more simple.

10-20V ? what voltage are you using ?
in schematic i see resistor near 7812 wrote 10 bleeter ? what that's mean ?

Thanks
La Ode
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Old 3rd May 2009, 04:32 PM   #1597
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+/- 10V is the best sounding voltage point I have finally chosen.

That ''bleeder'' resistor is to help discharge the timing circuit. The 7812 is powering that circuit. You will have to omit all that part. Only use the 1Meg resistors to ground. Also try 220R gate stoppers and 220R output series resistors if you can attach them directly to the Jfets. It will sound more dynamic.
The concept in brief is as in the attachment.
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File Type: gif caplessb1.gif (4.8 KB, 1138 views)
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Old 3rd May 2009, 05:32 PM   #1598
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Quote:
Originally posted by Salas
+/- 10V is the best sounding voltage point I have finally chosen.

That ''bleeder'' resistor is to help discharge the timing circuit. The 7812 is powering that circuit. You will have to omit all that part. Only use the 1Meg resistors to ground. Also try 220R gate stoppers and 220R output series resistors if you can attach them directly to the Jfets. It will sound more dynamic.
The concept in brief is as in the attachment.
can i use a little bigger value of pot. for volume control (25K)?
i use stepped attenuator (ladder type).

and what maximum v in input ? can 2V input?

Yeah, that's better schematic picture.
Terimakasih Banyak = Thank's A Lot Salas

I will repot if i have finish this one.
La Ode
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Old 3rd May 2009, 08:44 PM   #1599
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Yes you can use 25k, only make the wiper to ground resistor 270k-330k. Don't omit that resistor! Strong DC will show up at output when switching the step attenuator if without that shunt resistor.

6VRMS input it can handle if with +/- 10VDC PSUs.

Good luck, I hope you will like it. Report your news.
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Old 4th May 2009, 04:11 PM   #1600
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Quote:
Originally posted by Salas
Yes you can use 25k, only make the wiper to ground resistor 270k-330k. Don't omit that resistor! Strong DC will show up at output when switching the step attenuator if without that shunt resistor.

6VRMS input it can handle if with +/- 10VDC PSUs.

Good luck, I hope you will like it. Report your news.
and for R1 = 220K still in use ?
270K-330K ? where i put this resistor ? can you draw me a simple schematic please.

Today i have replace the old 25K stepped attennuator with 22K value.
recalculate all the resistor again, that's pain but FUN!
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