Just wondering if anyone has built this
http://www.solorb.com/elect/sidetone/index.html. I'm looking for anyone
who has made a pcb out of it. Or if anyone would be willing to help me go
through the schematic a bit. I'm relatively new to reading schematics and
I'm sure this is not the one to start with but it looks like a good
project to help learn Morse code. If you are willing please contact me at
atkinss at shaw dot ca.

Stephen

Good lord, what a Goldburg way of doing things.

Use one transistor in a phase-shift oscillator configuration and chose
your components for the same waveform ;-)

--
Gregg "t3h g33k"
http://geek.scorpiorising.ca
*Ratings are for transistors, tubes have guidelines*

"Gregg" wrote in message
news:aPlPd.44227$L_3.26165@clgrps13...
Good lord, what a Goldburg way of doing things.

Use one transistor in a phase-shift oscillator configuration and chose
your components for the same waveform ;-)

Won't work. He has the amplitutude ramping up and down at the beginning and
end of the tone.

The same thing could be done digitally by a fast microcontroller. I think it
would be quite easy with a software DDS.

73, Leon

"Gregg" wrote in message
news:aPlPd.44227$L_3.26165@clgrps13...
Good lord, what a Goldburg way of doing things.

Use one transistor in a phase-shift oscillator configuration and chose
your components for the same waveform ;-)

While you may not get the same effect or knowledge of building the circuit
there are some ICs that will do that in one small package.
Even the one transisitor oscillators are good enough for learning the code.

Use one transistor in a phase-shift oscillator configuration and chose
your components for the same waveform ;-)

While you may not get the same effect or knowledge of building the circuit
there are some ICs that will do that in one small package.
Even the one transisitor oscillators are good enough for learning the
code.
=========================
Indeed a single transistor 'double Tee' phase shift oscillator with a single
chip audio amp ,if you wish to use a loudspeaker , + a key is all you need
to learn /practice morse code.
It is a popular 'very simple project' candidates for the UK Intermediate
Licence can choose to do .
At the moment candidates for this AR licence have to construct something
simple in order to be assessed for basic construction/soldering skills.

Frank GM0CSZ / KN6WH

Behold, Leon Heller scribed on tube chassis:

"Gregg" wrote in message
news:aPlPd.44227$L_3.26165@clgrps13...
Good lord, what a Goldburg way of doing things.

Use one transistor in a phase-shift oscillator configuration and chose
your components for the same waveform ;-)

Won't work. He has the amplitutude ramping up and down at the beginning
and end of the tone.

Hi Leon!

Sure will, I've done it....by accident ;-)

Had a slow-starting conventional phase-shift oscillator once and decided
to "fix it".....ended up using the "flaw".

Changed the oscillator and adjusted the Re so you get a nice shaped rise
on the leading edge, cap from keyside to ground gives you the lead-out and
a little 1N4148 in the base-bias keeps her stable across room temprature
range from 15 to 25C.

IIRC, the xsistor I used was a 2N5088, replacing the existing 2N2222 for
more gain control.


--
Gregg "t3h g33k"
http://geek.scorpiorising.ca
*Ratings are for transistors, tubes have guidelines*

On Sat, 12 Feb 2005 13:32:43 GMT, "Highland Ham"
wrote:


Indeed a single transistor 'double Tee' phase shift oscillator with a single
chip audio amp ,if you wish to use a loudspeaker , + a key is all you need
to learn /practice morse code.

Any method of locally generating the Morse characters are OK for
learning the Morse code.

It is a popular 'very simple project' candidates for the UK Intermediate
Licence can choose to do .
At the moment candidates for this AR licence have to construct something
simple in order to be assessed for basic construction/soldering skills.

According to the ITU-R recommendations, including the third harmonic
(for non-fading circuits) or even the 5th harmonic (for non-fading
circuits) is enough. For 12 WPM, this would translate to 30 or 50 Hz
bandwidth.

Why should any CW enthusiasts be encouraged to use any emissions
broader than this ?

Paul OH3LWR