morse code in another

code pratice chart

Morse Code PICS

HAM INTRODUCTION

INTRODUCTION
The VEC-254 is the finest keyed oscillator on the market. Its professional
quality is well suited for demanding classroom use and abuse. The VEC-254's
unique design removes any harsh key clicks. Making the VEC-254 a perfect
complement to any keyer paddle. This unit enhances classroom instruction of
Morse Code by delivering a full watt of power to the internal 3 inch speaker.
Key clicks can be especially annoying in high output units where they tend to
bounce around the room. The VEC-254 produces a true pure sinewave so you'll
hear the clearest sounding tone you have ever heard from a code practice
oscillator. You'll get low distortion CW--typically less than .2% total harmonic
distortion from its BTL (Bridge-Tied-Load) amplifier.
FRONT PANEL
Power (On/Off)................................Power Switch
Volume............................................Volume Control
Tone ................................................Tone Control
Pwr ..................................................Power Indicator
Key Input.........................................1/4" Phone Jack
REAR PANEL
Power...............................................2.1mm Coaxial Jack
Ext. Speaker ....................................3.5mm Speaker Jack
OPERATION
The VEC-254 requires a 12V source for power operation. The power jack
accepts a 2.1mm coaxial type plug with the outside sleeve as the ground pole and
the inside as the positive pole. Apply power to the unit by plugging a power
adapter to the jack on the back of the unit labeled "Power". With the switch in
the Off position (out), connect a keyer paddle to the "Key Input" of the VEC-
254. The Key Input requires a 1/4" mono or stereo plug with a 2-conductor wire
from the keyer. The sleeve is connected to ground and the other wire is
connected to the tip. Once the power and keyer have been attached, the VEC-
254 is ready to use. Push in the power switch to the On position and verify that
the indicator labeled "Pwr" is lit.

Morse Code - Code Practice Oscillator

Morse Code - Code Practice Oscillator

Assembling a Code-Practice Oscillator
It isn’t difficult to construct a code-practice oscillator. A complete oscillator that mounts on a small piece of wood is
shown in Figure A. Figure B shows all the parts for this project laid out ready for assembly. The circuit board for this project
can be ordered from FAR Circuits, 18 N. 640 Field Court, Dundee, IL 60118-9269. A complete parts kit, including circuit
board, is available from the Hoosier Lakes Amateur Radio Club, PO Box 981, Warsaw, IN 46581-0981
Contact these vendors for the latest pricing.
Please read all instructions carefully before mounting any parts. Check the parts-placement diagram for the location of
each part.



o Check each box as that part is installed and soldered.
Radio Shack Component Used in
Quantity Description Part Number Number Step Number
Capacitors
o 1 0.01-mF 272-131 C1 3
o 1 0.01-mF 272-131 C2 6
o 1 220-mF, 35-V electrolytic 272-1029 C3 5
Resistors
o 1 10-kilohm, 1/4 W (brown-black-orange stripes) 272-1335 R2 4
o 1 47-kilohm, 1/4 W (yellow-violet-orange stripes) 272-1342 R3 8
o 1 10-kilohm, 1/4 W (brown-black-orange stripes) 272-1335 R1 9
o 1 47-ohm, 1/4 W (yellow-violet-black stripes) 271-009 R5 11
Miscellaneous
o 1 100-kilohm potentiometer 271-284 R4 7
o 1 8-pin IC socket 276-1995 2
o 1 7555 CMOS Timer IC (or 555 Timer IC) 276-1718 U1 13
o 1 Loudspeaker — 2-inch, 8-ohm 40-245 LS1 11
o 1 Six to 10 inches of insulated wire, about 18 11
or 22 gauge
o 1 9-V battery connector 270-325 10
o 1 9-V battery 23-553 BT1 10
o 1 U-shaped battery holder 270-326 12
o 1 Brass rod, 2 inches long, approximately
18 gauge (about the diameter of a coat hanger).
Available at hobby shops.
o 4 1/4-inch spacers 64-3024 12
o 1 2´ 4 ´ 1/2-inch piece of wood for base 12
o 5 No. 6 wood screws, 3/4-inch long 12
o 2 No. 6 wood screws, 3/8-inch long 12
o 1 Five-lug tie point, used to mount speaker (optional) 274-688 11