John Linsley Hood Ripple Eater - Part 2 - Page 5 - diyAudio
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Old 19th October 2010, 11:58 AM   #41
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Please include me for 2 sets.

Thank you.
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Old 19th October 2010, 08:37 PM   #42
Ryssen is offline Ryssen  Sweden
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Quote:
Originally Posted by Woodenhead View Post
*looks at pcb from previous GB*

Q5 (bc640 on the +ve board) is marked on PCB, to the right of Q3, C3.

Q5, 6 aren't, well spotted that man!

They are both 2SA1930 on the +ve version, 2sc5171 on the -ve.
Maybee itīs me..but on the schema on the possitive i says Q6 2SA1930
on the manual it says Q6 2SC5171.

whats right?
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Old 19th October 2010, 09:02 PM   #43
sandyK is offline sandyK  Australia
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Quote:
Originally Posted by Ryssen View Post
Maybee itīs me..but on the schema on the possitive i says Q6 2SA1930
on the manual it says Q6 2SC5171.

whats right?
Ryssen

When configured as a +VE rail version, the transistors used are 2 x BC550C,
BC639, and 2 x2SC5171. The optional Current Limiter device is a PNP 2SA1930.

When configured as a-VE rail version, the transistors used are 2 x BC560c,
BC640,and 2 x 2SA1930.The optional Current Limiter device is a NPN 2SC5171.

This will permit operation with voltage rails up to +-40V, as long as suitably rated 10uF and 100uF capacitors are used. It would be advisable to fit small heatsinks to the Current Limiter devices when used above +-20V.

Alex.
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Old 19th October 2010, 09:18 PM   #44
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Quote:
Originally Posted by Ryssen View Post
Maybee itīs me..but on the schema on the possitive i says Q6 2SA1930
on the manual it says Q6 2SC5171.

whats right?
Ryssen,

Q1 is the current limiter for the positive it is 2SA1930; Q4 & Q6 are 2SC5171;
for the negative Q1 is 2SC5171 and Q4 & Q6 are 2SA1930.

The problem lies in the earlier reported non-labelling of these 3 trannies, to add to the confusion the circuit diagram on page 8 of the full manual has different numbering for the various devices.

Looking at the board Q1 is the tranny next the +ve input and R1.

In the circuit diagram Q6 is the current limiter - ignore the naming used!! As I said I will produce an overlay ASAP. The silk screen is correct and ties in with the BOM.

Alan
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Old 19th October 2010, 09:30 PM   #45
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Quote:
Originally Posted by Ryssen View Post
Maybee itīs me..but on the schema on the possitive i says Q6 2SA1930
on the manual it says Q6 2SC5171.

whats right?
Yes, I cocked up there, my apologies. It is as SandyK has posted and listed in the downloadable manual.

The schematic that corresponds to the BOM is on page 17 of the build manual.
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Old 19th October 2010, 09:47 PM   #46
Ryssen is offline Ryssen  Sweden
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Ok,now I should get it together.
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Old 20th October 2010, 12:58 PM   #47
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Please wait until the boards have arrived and have been checked before paying

Alan
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Old 22nd October 2010, 10:52 AM   #48
shoom is offline shoom  Europe
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hi Alan

any chance of putting me down for 10 boards.

thanks

take care
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Old 23rd October 2010, 12:41 PM   #49
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Hi Alan,

Please putt me in for 6 boards.

Cheers Hans.
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Old 23rd October 2010, 12:44 PM   #50
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Alan,

Hello!

Please reserve 4 boards for me (that's 2 'stereo' +ve/-ve pairs, right?)

Cheers,

Steve.

PS What a fantastic way to raise money for charity!
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