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Old 12th February 2018, 02:46 PM   #741
marconi118 is offline marconi118  Germany
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OK I got it now.
Will try this with a bridge rectifier
thank for your help
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Old 12th February 2018, 04:52 PM   #742
xrk971 is offline xrk971  United States
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So would a frequency dependent LCR meter that shows graph of impedance vs frequency (like DATS) do the same thing?
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Old 12th February 2018, 05:04 PM   #743
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no way Bubba

you need some electronic apparatus , comparative to Dynamometer in mechanical world

saturation means loaded ......
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Old 14th February 2018, 10:11 AM   #744
marconi118 is offline marconi118  Germany
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I measured 30mH starting declining at 2A
what is the safe bias I can go?
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Old 14th February 2018, 07:18 PM   #745
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no more than 1A5 to 1A7
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Old 15th February 2018, 01:42 AM   #746
LBHajdu is offline LBHajdu  United States
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If someone wanted to go all out on parts my guess is the Lundahl LL2733 filament current choke may work well. It has two coils which you can put in series or parallel. In series it gives 400mH at a recommended current of 1.7A saturating at 2.7A. Or in parallel it gives 100mH with a recommended current of 3.4A saturating at 5.4A. It's $100 from K&k audio (no affiliation). The LL1694 is also a contender. They claim to wind and gap them as meticulously as there audio transformers and IMO they look sexy if indeed a choke is capable of looking sexy.
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Old 15th February 2018, 11:55 AM   #747
sledwards12375 is offline sledwards12375  United States
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LBHadju:

The Lundahl 2733 is the choke used in my MoFo monos. See post #669.

Steve
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Old 15th February 2018, 01:05 PM   #748
Anchan is offline Anchan  United States
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There is quite a range of inductance values between all of these chokes. What is the effect on the circuit as these inductance numbers change? Maybe V = L dI/dt comes into play? But I'm not sure how it all ties together.
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Old 16th February 2018, 01:39 AM   #749
LBHajdu is offline LBHajdu  United States
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Quote:
Originally Posted by sledwards12375 View Post
LBHadju:

The Lundahl 2733 is the choke used in my MoFo monos. See post #669.

Steve
Apologies sledwards12375 I actually looked at the image, it's well built, but didn't realize it was the Lundahl. I should have looked closer as it's printed on the package.

Anchan if the inductance is insufficient, there will be insufficient magnetic field for it to swing negative getting worst at low frequencies. And swinging positive will also be difficult if it does not have sufficient impedance between the mosfet source and ground. I would need to do an LTSpice simulation to see what it looks like in practice.

Leve

Last edited by LBHajdu; 16th February 2018 at 01:50 AM.
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Old 16th February 2018, 09:40 AM   #750
marconi118 is offline marconi118  Germany
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are 30mH ok for 50hz ?
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