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Old 24th July 2008, 09:23 PM   #281
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by A Sanchez
Hi, a newbie here,

.....
\
B1 is exactly what you need for chipamp , either it is inverted or not ;

you can rid off input cap in B1 if you feed it with +/-9V , tying input gate to gnd , instead to resistive divider on half PSU voltage , as in original B1
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Old 24th July 2008, 10:19 PM   #282
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Quote:
Originally posted by Zen Mod


\
B1 is exactly what you need for chipamp , either it is inverted or not ;

you can rid off input cap in B1 if you feed it with +/-9V , tying input gate to gnd , instead to resistive divider on half PSU voltage , as in original B1
Thanks Zen,

My chipamp is a non inverted one : http://www.diyaudio.com/forums/showt...38#post1569138 and these are the schematics: http://www.vikash.info/audio/p2plm3886/

I have a spare 2X18V 300 watts toroidal transformer and I wonder if I could use it with a regulator for the B1 project. I really do not understand what you mean with feeding the B1 with +- 9V. The schematics say 18V.

Antonio
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Old 24th July 2008, 10:43 PM   #283
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Quote:
Originally posted by Tolu




So, dear members: don't discuss like hell theories, talk about the sound!
Personally I have been sitting with my F3 for months , listening , playing my instruments with music , wondering how good that amp can be .

Now just give me some days , for having some "experience " with the B1 which is playing very very well , and also let me take some pics of it to let you see.




PS , dont forget I have also the new entry F5 ....

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Old 24th July 2008, 10:51 PM   #284
udailey is offline udailey  United States
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Sanchez, check out the schematic for the F5 by Nelson Pass. This is as easy to build as the B1 and will probably blow your mind. I paid an extraordinarily low amount to build the F5 and you can put that toroid to good use rather than using it for the B1. Of course you could just power both of them from that one toroid, but dont waste that big ol toroid on 200ma of power for the B1. Just go get a wallwart out of your bag of old computer junk you dont use anymore.
Uriah
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Old 24th July 2008, 11:18 PM   #285
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by udailey
Sanchez, check out the schematic for the F5 by Nelson Pass. This is as easy to build as the B1 and will probably blow your mind. I paid an extraordinarily low amount to build the F5 and you can put that toroid to good use rather than using it for the B1. Of course you could just power both of them from that one toroid, but dont waste that big ol toroid on 200ma of power for the B1. Just go get a wallwart out of your bag of old computer junk you dont use anymore.
Uriah

hehe - ya mean on 20mA , not 200 ?





Quote:
Originally posted by A Sanchez


Thanks Zen,

My chipamp is a non inverted one : http://www.diyaudio.com/forums/showt...38#post1569138 and these are the schematics: http://www.vikash.info/audio/p2plm3886/

I have a spare 2X18V 300 watts toroidal transformer and I wonder if I could use it with a regulator for the B1 project. I really do not understand what you mean with feeding the B1 with +- 9V. The schematics say 18V.

Antonio
in 10 min. I'll post re-drawed circ for you

edit :

little more than 10 min

here it is : you can mount it in same case with chip/drek amp , using any type of IC or discrete voltage reg , to have nice and stable +/-9V , from same PSU ( of chipamp ) ;

dunno - probably LM317/LM337 will do the job for you , or nice discrete zenner followers
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Old 24th July 2008, 11:52 PM   #286
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@ A Sanchez .... again

build it , enjoy it ....... and think about building proper amp , for change .......

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Old 25th July 2008, 03:21 AM   #287
udailey is offline udailey  United States
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Give or take a 0
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Old 25th July 2008, 07:30 AM   #288
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Quote:
Originally posted by Zen Mod
@ A Sanchez .... again

build it , enjoy it ....... and think about building proper amp , for change .......

Thanks for your replies.

Zen thanks for the schematics. Yes it seems really easy and I can put it inside the same box as you say, so I only need the few components and perforated board. I will definitely give it a try.

Ah! and yes I will definitely also build a more sophisticated amp next year. I started with a chipamp because it is the easiest way to learn to solder and to read schematics. I did start from zero not so long ago and thought that was the best way to go.

Antonio
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Old 25th July 2008, 09:11 AM   #289
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Some pictures of the B1 :
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Old 25th July 2008, 09:12 AM   #290
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the second for the inside and back ...
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