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Old 7th September 2008, 02:36 PM   #2381
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Quote:

(it's probably time for one more Papalike RIAA ........... ) [/B]

speaking of which... Jacco, the eagle has landed.. I repeat, the eagle has landed.

10-4
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Old 7th September 2008, 02:45 PM   #2382
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got ya, sounds more like a crippled duck.
Instead of ETA they should give the EYA.
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Old 7th September 2008, 11:06 PM   #2383
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Quote:
Originally posted by luvdunhill



speaking of which... Jacco, the eagle has landed.. I repeat, the eagle has landed.

10-4

Quote:
Originally posted by jacco vermeulen
got ya, sounds more like a crippled duck.
Instead of ETA they should give the EYA.

?
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Old 7th September 2008, 11:14 PM   #2384
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last ot.
holger, d3 is "just" fast. buy d700. same pics, but slower (slow between pics)

greets
stefan
edit d700 instead of d300
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Old 7th September 2008, 11:40 PM   #2385
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Zen Mod: a certain part-monger sent me some little blue boxes for a RIAA filter.

Jacco: is there a third significant digit that I can aim for on those 3 capacitance values? I have access to a capacitance bridge at my dad's university lab, but it probably hasn't been calibrated in years probably better than nothing though.

Zen Mod: what to do with the CT and electrostatic shield wire from transformer (I don't have them yet, but... still would like to know) do they go to the board, or some sort of star ground through a thermistor?
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Old 7th September 2008, 11:49 PM   #2386
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Quote:
Originally posted by luvdunhill
......
Zen Mod: what to do with the CT and electrostatic shield wire from transformer (I don't have them yet, but... still would like to know) do they go to the board, or some sort of star ground through a thermistor?

shield winding from xformer goes directly to safety ground (case ) .

CT goes to safety ground/case either via NTC ........... or via NTC

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Old 8th September 2008, 12:27 PM   #2387
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Cig-Lighter,

check your email.

Building a capacitance meter with <1% accuracy is pretty easy, bet you a nickle there are plenty of schematics on the web.
0.1% is possible too, becomes a bit pricey though.
Calibrating a cap-meter is peanuts with a reference capacitor.
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Old 16th September 2008, 06:21 PM   #2388
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my little transformers just shipped from hong kong! it won't be long before the fireworks (either figuratively or not) begin!
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Old 19th September 2008, 10:21 AM   #2389
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G'Day Zen Mod,

Please can you tell how to work out the RC ratio, from cookie book

note 2 . use mica if you find ; value must be scaled according to value of R5/R6 ; if
you decrease/increase value of R5/R6 then increase/decrease value of C1/C2 to
preserve approx. same RC ratio.

Cheers
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Old 19th September 2008, 04:28 PM   #2390
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Quote:
Originally posted by Assesears
G'Day Zen Mod,

Please can you tell how to work out the RC ratio, from cookie book

note 2 . use mica if you find ; value must be scaled according to value of R5/R6 ; if
you decrease/increase value of R5/R6 then increase/decrease value of C1/C2 to
preserve approx. same RC ratio.

Cheers

R5/R6 =100K
C1/C2 = 5pF

so - RC = 100Kx5pF=5x10^-7

that's in fact connected to corner frequency of that RC pair

simple - if you decrease R5/R6 to 47K , you must increase C1/C2 (to preserve same multiple ) to ~ 10pF

so- C1/C2 = 5x10^-7/47K = 10p6

clear enough ?
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