 Milestone Technologies |
 a division of Milestone Technologies, Inc. "Everything for the Morse Enthusiast!" |
 |
 |
| Milestone Technologies |
a division of Milestone Technologies, Inc. "Everything for the Morse Enthusiast!" |
|
|
 |
 |
 |
 |
 |
MX T-Tone
Code
Practice Oscillator Kit
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Designed by Morse Express and WB9KZY, the T-Tone CPO uses a "twin-T" oscillator circuit to provide a shaped sine-wave tone, which is much more pleasant to listen to than the 555 timer-based square wave oscillator typically found in CPOs. It is also much better for FM transmission, and will support high-speed keying with a paddle and electronic keyer. A "line out" signal at up to 600mVPP is available, and a zobel network on the output of the amplifier provides for clean audio at higher volumes. Click here for a demonstration of the T-Tone's audio output when keyed by hand at around 15wpm and by a electronic keyer at 28wpm. The classic Twin-T oscillator circuit is the same circuit used for the side-tone in OHR transceivers. It feeds an LM-386 audio amplifier to provide plenty of audio power to drive a small speaker (included). The kit includes a high-quality printed circuit board, all necessary parts and controls, and detailed, illustrated instructions. The off-board parts, which are not shown in the photo, ARE included in the kit-- a 9V battery connector, RCA jacks for key input and line out, an audio taper pot for volume control, power switch, 8 Ohm speaker, and hookup wire. The frequency of the tone is variable via an onboard trim-pot. The oscillator runs continuously, but its output is grounded through the 2N7000 MOSFET keying transistor. A second trim-pot works with the 2N7000 to shape the wave train, providing for crisp, clean dots and dashes even with electronic keyers at high speeds. A suitable enclosure is our 6.5x3x2 inch project box |
| MX T-Tone Code Practice Oscillator Kit - $19.95 |
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| Project box for MX T-Tone CPO - $5.95 |
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or call 303-752-3382 for more information |
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