QRZ Forums - Radio Circuits, Repair & Performance for Monday 2 October 2017
 

Radio Circuits, Repair & Performance

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Power Topologies Handbook : Texas Instruments

Posted: 02 Oct 2017 04:12 PM PDT
https://forums.qrz.com/index.php?thr...uments.583321/

Power Topologies Handbook

by Markus Zehendner and Matthias Ulmann

Texas Instruments

https://www.ti.com/seclit/ug/slyu03....quasegment-wwe

This book shows waveforms and equations of the most common hard switched
power supply topologies and the soft switched Phase-Shifted Full-Bridge.

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ICOM 756 PRO display issue

Posted: 02 Oct 2017 08:49 AM PDT
https://forums.qrz.com/index.php?thr...-issue.583267/

I came across an interesting problem on an Icom 756PRO. The issue is with
a control board. The board works perfectly but the display is monochrome,
specifically green letters on a black background only. This condition
exists regardless of the display option settings. This is strictly a
control board issue as with another control board installed in the radio
the display is fine. Any Icom experts out there that have ideas?