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Old 6th August 2011, 01:39 PM   #401
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Silver micas have been snapped by Ian....


Fran
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Old 6th August 2011, 02:18 PM   #402
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Quote:
Originally Posted by Salas View Post
Naah, no good anymore, rather confusing on first look without had read, those come from different protos arrangements, lets revise up to what's adopted up to now and synchronize them schematics a bit.
Valve Itch all resistors 1/4W except: R2 & R10?

PSU Itch all resistor 1/4W except: R1 & R4?
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Old 6th August 2011, 02:54 PM   #403
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Yes, although I cannot see R1 in the two box PSU.....

Note also that the shunt is a separate item.... BOM is almost done, just needs checking.


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Old 6th August 2011, 03:35 PM   #404
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Quote:
Originally Posted by woodturner-fran View Post
Yes, although I cannot see R1 in the two box PSU.....

Note also that the shunt is a separate item.... BOM is almost done, just needs checking.


Fran
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File Type: gif VI1_1PSU.gif (13.5 KB, 368 views)
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Old 6th August 2011, 03:52 PM   #405
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Yikes,

I looked at that 10 times carefully to try and find it and couldn't see it!!


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Old 6th August 2011, 04:32 PM   #406
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Old 7th August 2011, 08:36 PM   #407
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I have the BOM ready, and it has already been examined by Salas. Would someone else volunteer to check it out? Let me know by PM if you would do it + your email address and I'll send it on.

Would be nice to get another pair of eyes to look before posting it here.


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Old 7th August 2011, 08:42 PM   #408
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If you need help with BOM YHPM
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Old 7th August 2011, 10:11 PM   #409
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by woodturner-fran View Post
Silver micas have been snapped by Ian....


Fran
Cool

I experimented with Silver Micas, PIO, Polystyrene & Tin Foil and now Teflon FT-1 on the 15nF placement and they all produce very different perspectives.

I hope I could get the Teflon definiton and extension with the Tin Foil/styrene presence and tone coherence, added with a little bit of SM snap
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Old 9th August 2011, 11:33 PM   #410
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Hi All,


attached is the BOM for the itch. It covers the valve itch circuit + the PS schematic shown above, i.e. heaters, basic HV but leaves out the actual shunt components.

The BOM is an excel type workbook. This first worksheet is the main BOM with links to mouser parts. The other worksheets show the schematics to match the BOM and a SSHV schematic with values to suit the itch current and voltage requirements is included. I have also included a PDF in case someone has no way of reading an excel file.

Purely selfishly, I have only done mouser parts as that's who I normally order this kind of stuff from. If someone would like to add digikey and farnell references as well, that would be fantastic. Likewise alternate ebay sellers for the other stuff too.

Now the disclaimer!! The BOM has been examined by 3 sets of eyes, mine, Salas and Merlin el Mago - BUT that's not to say there isn't some mistake in there, or indeed that a better choice could be made. So please keep your eyes open and minds active when doing your order!!!

Please let us know here if you do find something wrong - it may save hassle for others coming after you.


Fran
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File Type: zip valve_itch_1_1.zip (162.5 KB, 176 views)
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