The Phonoclone and VSPS PCB Help Desk - Page 9

rjm · 27th September 2005, 02:53 PM

To prove it could be done: here is a phonoclone version with with the LM78xx/79xx replaced with LM317/337s.

/R

brainspex · 27th September 2005, 04:56 PM

I found it convenient to use variable regulation for the 3*7. You can adjust the voltage precisely and you can use different voltage supply +-10V, +-12V, +-15V just for exploration. I think variable resistors do no cost that much and results are more flexible.

- BSPX

PauSim · 29th September 2005, 05:56 PM

Just to say boards arrived today. Thanks.

Bas Horneman · 29th September 2005, 07:21 PM

Mine too...Thanks!

kn · 30th September 2005, 07:26 AM

In only four days.
What exactly does KJ think is wrong with the Japanese post?

rjm · 30th September 2005, 08:33 AM

This is wa-ay off topic, but ...

Japan Post is also the country's largest saving bank, with some trillion dollars in the vault. The polical moves are all about who gets to control this piggy bank, and how the money gets reinvested into the country's economy. Nothing to do with the mail service, which is stellar, or even its inefficiency.

/R

toseland · 30th September 2005, 08:43 AM

Richard it appears to me that the conversion of the VSPS boards to take a VSPS Ultra requires:-

1) the removal of R1 and R2
2) the cutting of IN+ to IC+ track near the IC.
3) Bridge between part of track comming from IN+ to track going
from C1 to IC-
and 4) Bridge from IC+ solder pad to COM track.

Is this correct or is there an easier way?

BT

rjm · 30th September 2005, 10:00 AM

Hi,

Sorry about the not getting back to you by email - but it was a bit more involved a question than I had time for this week.

Ok, double check everything I write here: I havent done the mod myself.

In its simplest form, the mod is as follows: use R1=10ohms, or bridge the pads with wire, leave out R2, and connect the input wire to the top pad where R2 would normally go.

/R

toseland · 30th September 2005, 11:33 AM

Thanks Richard

That will work.

BT

ran_ph · 30th September 2005, 11:35 AM

I have a question about lm317/lm337 regulation.

Lets say for an output of 15v we set R1 = 121ohms and R2 = 1330ohms. If the maximum possible current (Iadj) flowing through R2 is 100uA (from datasheet) then the voltage across R2 (also across C2) is 0.0001 x 1330 = 0.133volts. Is this correct?

I am asking because I want to use a 22uF/6.3v Blackgate Nx for C2 and I want to make sure the voltage rating will suffice.

27th September 2005, 04:56 PM	#82
brainspex diyAudio Member Join Date: Mar 2005 Location: Cologne	*New Board 37 Regulation** I found it convenient to use variable regulation for the 3*7. You can adjust the voltage precisely and you can use different voltage supply +-10V, +-12V, +-15V just for exploration. I think variable resistors do no cost that much and results are more flexible. - BSPX

29th September 2005, 05:56 PM	#83
PauSim diyAudio Member Join Date: Jan 2004 Location: Portugal	Just to say boards arrived today. Thanks. __________________ Paulo

29th September 2005, 07:21 PM	#84
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	Mine too...Thanks! __________________ Boatanchor amps forum My "adventures" in audio

30th September 2005, 07:26 AM	#85
kn diyAudio Member Join Date: Sep 2005	my boards also arrived In only four days. What exactly does KJ think is wrong with the Japanese post?

30th September 2005, 08:43 AM	#87
toseland diyAudio Member Join Date: May 2002 Location: -Southampton, England	Conversion to VSPS Ulra Richard it appears to me that the conversion of the VSPS boards to take a VSPS Ultra requires:- 1) the removal of R1 and R2 2) the cutting of IN+ to IC+ track near the IC. 3) Bridge between part of track comming from IN+ to track going from C1 to IC- and 4) Bridge from IC+ solder pad to COM track. Is this correct or is there an easier way? BT


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30th September 2005, 08:33 AM	#86
rjm Richard Murdey diyAudio Member Join Date: May 2004 Location: Kyoto Blog Entries: 32	This is wa-ay off topic, but ... Japan Post is also the country's largest saving bank, with some trillion dollars in the vault. The polical moves are all about who gets to control this piggy bank, and how the money gets reinvested into the country's economy. Nothing to do with the mail service, which is stellar, or even its inefficiency. /R

30th September 2005, 10:00 AM	#88
rjm Richard Murdey diyAudio Member Join Date: May 2004 Location: Kyoto Blog Entries: 32	VSPS to VSPS Ultra PCB mod Hi, Sorry about the not getting back to you by email - but it was a bit more involved a question than I had time for this week. Ok, double check everything I write here: I havent done the mod myself. In its simplest form, the mod is as follows: use R1=10ohms, or bridge the pads with wire, leave out R2, and connect the input wire to the top pad where R2 would normally go. /R

30th September 2005, 11:33 AM	#89
toseland diyAudio Member Join Date: May 2002 Location: -Southampton, England	VSPS to VSPS Ultra PCB mod Thanks Richard That will work. BT

30th September 2005, 11:35 AM	#90
ran_ph diyAudio Member Join Date: Jun 2004 Location: makati	Question about lm317/lm337 regulation I have a question about lm317/lm337 regulation. Lets say for an output of 15v we set R1 = 121ohms and R2 = 1330ohms. If the maximum possible current (Iadj) flowing through R2 is 100uA (from datasheet) then the voltage across R2 (also across C2) is 0.0001 x 1330 = 0.133volts. Is this correct? I am asking because I want to use a 22uF/6.3v Blackgate Nx for C2 and I want to make sure the voltage rating will suffice.

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