diode bridge

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From: Charles Cashion (ccashion@spdmail.spd.dsccc.com)
Date: Mon Dec 04 1995 - 14:14:28 EST


Gentlemen and Q-R-Peers:

Charles Copeland <charles1@netcom.com> reported ( cc> )

 cc> HELPFUL HINT:
 cc> Install a diode bridge on DC input. (usually used to rectify AC to DC).
 cc> No matter what polarity you connect DC to board, the correct polarity
 cc> will be presented to the circuit board.

Yes. What Charles says is true. But, in addition, you also give up at
least 1.2 volts loss, and it leaves your receiver circuit riding at
least 0.6 volts above power supply ground. With a little forethought,
the 1.2 volts loss might be compensated (and therefore acceptable).
But if the receiver circuit were riding 0.6 volts above ground, and
the antenna circuit were not isolated from ground (i.e. the antenna
circuit is grounded), then I believe you have intentionally created a
ground loop (not desireable).

OBQRP: I have found my Explorer II. (which is to say it went on a little
exploration of its own?). It is sitting in an OOPS -- err -- UPS warehouse
someplace in North Dallas.....But on the other hand, without a valid
license, I really have no use for an Explorer just yet.

OB-humor: Who was it that said, "we don't need no stinkin licenses!"

Charles Cashion

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| ARRL  NorTex#116  NorCal#1320  QRP-L#76  ex-W5ISZ |
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