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Old 10th February 2013, 03:27 PM   #11
hpeter is offline hpeter  Europe
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Quote:
Originally Posted by Elvee View Post
1.5H is not much, but it can be useful tough, and it could be parallel-tuned for 100Hz.
actually,is enough
i did simulations of same capacity used in multiple CLC filter, and compared to single choke 10H vs two 1H
/hammond has low current types at hi inductance, i was curious what is better- if one heavy or two smaller chokes/

believe or not, the two choke was better, and this has decreasing ripple with increasing current. (second one starts kickin in)
but single type had increasing ripple with

36W lamp choke /i have no LCmeter at home/ seems has ~0,94H 2,7µF paratune
(according to lamp datasheets 100V@0,43A)
18W lamp should have ~1,5H,
58W 0,57H
difference between currents are not high, therefore 18W seems best

also tried primary of 230 transformer as choke, but it failed-no filtering at all(obviously), but these puppies works for me
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Old 11th February 2013, 10:42 AM   #12
alka161 is offline alka161  Russian Federation
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Quote:
Originally Posted by Elvee View Post
I just measured a 15W ballast (for 230V). The (cold) DC resistance is 56 ohm, and the inductance is 1.56H (under small signal; at the nominal current, it is normally higher).
The maximum rms current is 0.33A --> 468mA instantaneous.
Strange. I measured the my choke by LCR meter, this is the result:
DC resistant of ~ 59 Ohms and the inductance is 115 mH
UFOlder.ru ?????????? ??????? ??????, ???????? ??????, ????? ???????.
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Old 11th February 2013, 12:56 PM   #13
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by alka161 View Post
Strange. I measured the my choke by LCR meter, this is the result:
DC resistant of ~ 59 Ohms and the inductance is 115 mH
UFOlder.ru ?????????? ??????? ??????, ???????? ??????, ????? ???????.
Click the image to open in full size.
Then, either your LCR meter does not work, or your ballast is damaged:

A fluorescent tube drops around ~100V; the reactance of your ballast is 0.115*6.28*50=36Ω, which results in a total impedance of 69Ω.
The current would be 130/69=1.88A, thus a power of ~188W in the tube: not very realistic
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Old 17th February 2013, 09:01 AM   #14
hpeter is offline hpeter  Europe
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testing few days tubeheadamp (ECC802+6L6), it is dead quiet, no hum

CLC+CRC supply with this 36W choke, AC filaments.
Beyers DT990 250ohm , TASCAM US200

satisfied very much
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Old 28th March 2013, 01:14 AM   #15
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Those chokes can be very usable in a PS. As allready mentioned, they are up to about 1,5H. If needed, you can use similar units in parallel/serial connections. I had the best results with "old" steel encased types (Philips) that have low dc-losses, low strayfields and no audible noise. If you want to know the exact inductance you must measure them in the actual circuit with the actual dc current applied (LCR meter readings may vary wildly and are most often worse than a educated guess).
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Old 28th March 2013, 01:28 AM   #16
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Quote:
Originally Posted by wabun View Post
Does it mean we can parallel the choke and ideally it should behave as follow..

50Ohms ( 1.5H ) || 50 Ohms (1.5H) = 25Ohms (3H)

and the max allowable current will double 0.33 A x 2 = 0.66A ?
2 x 50ohm 1,5H 0,33A in parallel = 25ohm 0,75H 0,66A
2 x 50ohm 1,5H 0,33A in serial = 100ohm 3H 0,33A
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