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John Linsley Hood Ripple Eater

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F

fff0

Member
Joined 2008
4 more to the list.

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 4
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4

TOTAL 211
 
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T

TheShaman

Member
Joined 2007
3 more.

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 4
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3

TOTAL 214
 
J

johngalt47

RIP
Joined 2004
Count me in for 4

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 4
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4

TOTAL 218
 
A

awpagan

Member
Joined 2004
Put me down for 4 pcb's
Allan
email sent

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 4
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4
awpagan 4

TOTAL 222
 
G

Ginum

Member
Joined 2008
Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 4
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4
awpagan 4
Ginum 6

TOTAL 228
 
EUVL

EUVL

Member
Joined 2003
xen-audio.com
I'll increase to 12 :

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 12
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4
awpagan 4
Ginum 6
johnYks 12

TOTAL 248
 
F

finneybear

Member
Joined 2003
I am in for 4.

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 12
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4
awpagan 4
Ginum 6
johnYks 12
finneybear 4

TOTAL 252
 
S

Spartacus

Member
Joined 2002
2 Please.

Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 12
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udaily 3
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4
awpagan 4
Ginum 6
johnYks 12
finneybear 4
Spartacus 2

TOTAL 254
 
J

jonclancy

Member
Joined 2002
AndrewT said:
Hi,
where is the technical input/enquiry thread for this Group Buy?

I have only found that other Forum.
Click to expand...

That's where all the info is, Andrew.

I opened the GB to DIYA when it became clear that, due to the requirement to be a signed-in member to see the GB thread over there, the project was not getting the traction it deserved.

This is non-profit and all proceeds are going to Cancer Research UK. Additionally, we are hoping to submit an article to ETI to update the 16 year old original. I have been incontact with Wimborne Publishing.

Outline technical details are at index , but most of these were lifted from JLH's original article.

Hope this helps,

Jon
 
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J

jonclancy

Member
Joined 2002
AndrewT said:
how about adding this Email address to post1 and/or adding it to Jon's signature.

jlh AT gt6.co.uk
Click to expand...

I'd prefer it if people went to the website and found the mail link there, as it will allow them to read through the material there and hopefully answer any questions they may have, rather than PMing me.

I'd also rather the full JLH email address was not published here in full, as it will only take a moment before the spam-bots start to fill the mailbox with V14GRA adverts!

I suppose the name list save me from having to update the Board-O-Meter every few hours!! :D

Cheers

Jon
 
U

udailey

Member
Joined 2008
picasaweb.google.com/udailey/MyRef#
Rock Grotto 84

Liliya 2
audi0 4
sandbasser 4
Jaimo 4
EUVL 12
housing 4
sandyhooker 2
piero7 2
ymwong 8
jims 10
Ed LaFontaine 6
jrenkin 4
pchw 4
paudux 6
neutron7 4
ppcblaster 10
puffin 10
grufti 4
touchdown 6
thosuk 6
cliff 4
MoodySteeve 4
udailey 6 UPDATED
korben69 4
fredlock 4
fff0 4
TheShaman 3
johngalt47 4
awpagan 4
Ginum 6
johnYks 12
finneybear 4

TOTAL 255
 
J

jonclancy

Member
Joined 2002
Tripmaster said:
Hi Jon

I have requested 6 boards via email

Thanks :)
Click to expand...

Thanks Richard!

For those interested, here is the PRELIMINARY BOM.

Actually, it's the one from the previous version, but will serve as a good indicator of which parts are required.

Here is the BOM:

I use MRS25 0.6W resistors - small size, decent power rating.

POSITIVE VERSION

R1,2,6,7,10 = 100K
R3,4 = 2K7
R5 = 2K2
R8 = 33R
R9 = 1K
R11, 13 = 10K
R12 = 1R 0.5W

C1,2 = 2U2 Film (Wima MKS)
C3,4 = 2200uF 10V Suntan CD286 from Jaycar RE6306
C5 = 10uF Electrolytic
C6 = 100uF 25V Electrolytic
C7 = Optional 100nF (0.1uF) Film (Wima)

D1,2 = 1N4148

Q1,2 = BC550C
Q3 = BC639

Semiconductor A (Current Limiter) = 2SA1930
Semiconductors B, C = 2SC5171


NEGATIVE VERSION

R1,2,6,7,10 = 100K
R3,4 = 2K7
R5 = 2K2
R8 = 33R
R9 = 1K
R11, 13 = 10K
R12 = 1R 0.5W

C1,2 = 2U2 Film (Wima MKS)
C3,4 = 2200uF 10V Suntan CD286 from Jaycar RE6306
C5 = 10uF 25V Electrolytic
C6 = 100uF 25V Electrolytic
C7 = Optional 100nF (0.1uF) Film (Wima)

D1,2 = 1N4148

Q1,2 = BC560C
Q3 = BC640

Semiconductor A (Current Limiter) = 2SC5171
Semiconductors B, C = 2SA1930

NOTES:

As you can see, the NEGATIVE version swaps the 2SA1930 and 2SC5171 semiconductors around, but they go in the PCB the SAME way shown on the silkscreen.

The NEGATIVE version also replaces the Q1, Q2 BC550C with BC560C devices, and the Q3 BC639 with a BC640. Also fitted the SAME way as the silk.

HOWEVER, The electrolytic capacitors, C3, C4, C5, C6 must be fitted REVERSED on the NEGATIVE version. Film caps don't mind which way they are installed, but a 'Lytic is polarised (directional) and if fitted the wrong way, will go off with a big pop! Additionally, the diodes, D1 and D2 must be fitted REVERSED to the silkscreen.

Fit -ve power in to left connector and keep GND on the right (as per the POS version).

From Alex's diagram, and in summary:

Current Limit = 0.65V x R12
To bypass the Current Limiter, remove the 2SA1930 (POS) or the 2SC5171 (NEG) limiter, D1 and D2, R12 and R13 and link from +ve or -ve in directly to R1.
Only do this if the PSRR is PRECEDED by a LM78xx/79xx or LM317/337 with built in current limiting, or your PSRR will draw a load of current on start up and go pop!

BC550C and 560C will enable operation up to +- 40V. But check CAP RATINGS!!!

C5 and C6 voltage ratings are selected to suit voltage rails. So for 15V rails, use 25V caps, for 40V rails, use 63V caps. Might get away with 50V, but I haven't tried this yet. A 55V version is out there, but as I mention, I haven't tried this yet. I intend to, for use on my Pearl phono raw power supplies.

R3 is optional. Fit for added performance only if Q1 and Q2 are matched. You can match hFE on your digital multimeter - do it, fit R3, know you've done a good job!
 
S

sandyK

Member
Joined 2007
JLH Ripple Eater

" R3 is optional. Fit for added performance only if Q1 and Q2 are matched. You can match hFE on your digital multimeter - do it, fit R3, know you've done a good job!"

I would recommend fitting this resistor irrespective. Most transistors from the same batch are often reasonably close in HFE and VBE.
Alex
 
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