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HR20• 18
• MORE AUDIO POWER - ANOTHER WAY
If you want to use your HR20 for casual band monitoring while you are busy
across the room, in the shop, to share with a class or club or group and want
LOTS more volume, try building up our very inexpensive Ramsey BN-9, 2 watt
general purpose amplifier kit. Supply DC voltage to such an amplifier
separately, using D-cells, a lantern or auto battery , or a well filtered power
supply.
• ADDING AN LED POWER ON INDICATOR
For many people, a pilot lamp to indicate “power on” is more than a nice
touch. They expect it and depend on it , reminding us that “real radios glow in
the dark!”
Adding a simple LED power-on indicator to your Ramsey HR20 is easy. All
you need is the LED itself and a small 1K or 2.2K resistor. Study the PC
traces between the positive battery supply wire and the on-off switch. The
unused connectors on top of your switch are an ideal point to get the + DC
voltage needed for the anode (longer lead) of the LED. Plan where and how
you wish to install the LED in your enclosure. Locating the LED immediately
above the on-off switch is ideal. The simplest way to make a neat installation
is to drill a hole just sightly smaller than the diameter of the LED. Then,
enlarge the hole a little bit at a time, just enough to let the LED be pressed in
and held firmly. The resistor may be connected to either the anode or cathode
side of the LED, but the anode must be connect to the + DC with the cathode
connected to the nearest common ground.
If you are wondering why we did not include these pennies worth of parts with
your kit , you can believe any of the following reasons: 1)We wanted to stretch
your battery budget and the current draw on the LED is about 6ma. How long
will your battery last if you leave your receiver on for a few days, just like we
leave on our computers and Ham gear on all the time? (2) We thought you’d
have more fun planning and installing your own lamp that glows in the dark!