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Old 14th June 2019, 03:32 AM   #2151
PRR is offline PRR  United States
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Location: Maine USA
Quote:
Originally Posted by Eric View Post
...variations of these transformers...
It is hard to generalize about iron-core windings.

However if the inductance is low, it would be a heavy load on the intended 120V/230V wall-power.

If the resistance is high it would get hot delivering the rated 1,000+ Watts to cook your food.

So there can't be any huge difference between the several models.

120V versus 230V should be a clear difference. I'm thinking most work has used 120V jobs, but some report 230V lumps.

Basically we are using a $300 part for a $30 chore, BUT these over-size parts are cheap or free, so we use a 1KVA part for a 20 Watt job.
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Old Yesterday, 08:07 AM   #2152
nzlowie is offline nzlowie  Australia
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Quote:
Originally Posted by Stanislav View Post
The choke is in parallel of the load (your 16 ohm driver) acting as a HP filter like in a 1st order series crossover.

Based on that you need a choke of around 6 - 7 mH, but with very low DCR, eg. 0.1 ohm would be good, lower even better.
Not sure how possible it is to find such a choke that can also handle the current of the MoFo.

Better approach IMHO would be to use whatever high current, low DCR choke you can find and then fit a cap that sets the HP point, in series with the positive input of the driver.
Calculate the value of the cap as for a 2nd order HPF.
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