Monthly Archives: March 2012

KK7B R2 receiver: lifted pads, a scorched board, and it works anyway

Posted on March 24, 2012 by Stephen Trier

I’m slowly making progress on my KK7B R2/T2 transceiver project. At my last report, I was waiting for replacement capacitors to arrive. They did, and I pulled out my ancient solder-removal iron, a Radio Shack unit from who knows how … Continue reading →

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Ouch! Watch out for power supply memory buttons

Posted on March 11, 2012 by Stephen Trier

What is it about power supplies?  They are so very boring, until suddenly they bring excitement. It’s always the wrong kind of excitement, too… It was a quiet day at work. I was using a GW Instek PST-3201 bench power … Continue reading →

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Cool chip: LT1970 power op amp with current limit

Posted on March 8, 2012 by Stephen Trier

This week I want to share a new favorite chip of mine, the LT1970 power op amp from Linear Technology. This nifty device runs from a 36 V supply and can source or sink 500 mA. That’s not too unusual, but … Continue reading →

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