Instruction manual

HR-80• 17
replacement. Remember the NE602 circuits similar to Ramseys
generally call for sets of C or D cell batteries! For Experienced
Builders more information regarding audio output is in the general
notes.
The simple design of the audio stage of the Ramsey HR-80 receiver
assumes preference for headphone or small speaker operation, low
battery drain and general economy.
• MORE AUDIO POWER - ANOTHER WAY
If you want to use your HR-80 for casual band monitoring while you
are busy across the room, in the shop, or to share with a class or
club, 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 A 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 HR-80 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