Rerurn to Romy the Cat's Site

Allo

Pieter is super-talented and a great guy; if you are a Larry David fan he looks a bit like his Dutch cousin...

The only problem is that he has a long waiting list... I don't think you would get the OPTs any time soon.

If we will try Sowters then I would suggest:

Primary inductance of about 2H, for use above 1kHz.

Turns ratio of 12:1 would give you a 2.4k load with 16 ohm secondary.

With a gap of 50mA, I reckon on the order of 1-2W may be possible at 500Hz - let's see what Brian thinks once spec is complete. Not sure the biggest mumetal core they have will handle much more.

As for secondary configuration, if you don't need the facility to play with taps, you are generally better off without all the connection options as you don't have to re-terminate all the secondary options. (The secondary will always need to be sectioned internally). If you do have taps, it's vital to use the entire secondary or else the tx is suboptimal.
Sowter have a range of options, scroll down at:

http://www.sowter.co.uk/2se.htm

So you pick any option except the "tapped" one! I don't understand why you want to insist on half series/half parallel connections when internally, the secondary is made of more than 4 sections? Just because the "mapping board" has 4 sections coming out of the tx...

Anyway, I will email Brian and see what he reckons.
cv

Rerurn to Romy the Cat's Site