Fw: Aw: Re: LF: A transductor for power regulation?

["Hans-Albrecht Haffa" <dk8nd@web.de>]

 

 

Gesendet: Samstag, 22. April 2017 um 16:21 Uhr
Von: "Hans-Albrecht Haffa" <dk8nd@web.de>
An: Langwellen-Reflektor <rsgb_lf_group@blacksheep.org>
Betreff: Fw: Aw: Re: LF: A transductor for power regulation?

 

 

Gesendet: Freitag, 21. April 2017 um 22:33 Uhr
Von: "Hans-Albrecht Haffa" <dk8nd@web.de>
An: rsgb_lf_group@blacksheep.org
Betreff: Aw: Re: LF: A transductor for power regulation?

Dear Lowfers,

years ago I have constructed a power reg. with a linear variable inductor. It was possible to regulate power from 1 kW down to 10 W / 60 Ohm at 136 kHz. The temp. coefficient of the inductor is that of the material N27, power dissipation is mainly due to dc losses in the dc-Winding in the centre leg. Clampes for the core halves I cold not use, as stray field in the saturated yokes caused edding currents in the clampes. So the core halves had been fixed with bath-room silicon from the diy-store/home store. Core size is ETD59.

More detrails upon request.

55,

Hans-Albrecht DK 8 ND

cba, qrz ok

 

 

 

Gesendet: Donnerstag, 20. April 2017 um 21:02 Uhr
Von: "Claudio Pozzi" <smtp01@email.it>
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: A transductor for power regulation?

On Thursday 20 April 2017 11:14:22 you wrote:

> Thanks for all the interesting contributions. The old book is a very

> nice one :-)

>

> I expect using saturated coils rather than a saturated transformer can

> give better results when it is used for keying a carrier (CW, DFCW,

> QRSS, OPERA...). But that will be rather a narrow band solution. The

> transformer has its advantages too. I will continue to improve the ratio

> between keyed and unkeyed power later...

>

> 73, Stefan

>

 

Some idea for the transformer...

 

May be that a small toroidal transformer core for mainline power supply can be useful for 2 and 6 kHz bands. But toroid are without transformer air gap.

 

A core from an old output transformer vacuum tube amplifier can surely be used from few hundreds Hz to 10 kHz, may be up to 20 kHz if salvaged from an Hi-Fi push-pull amplifier. Audio transformer are with air gap.

 

73 de Claudio ik2pii

 

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