Morse Oscillator using a 555 Project...

[2E0MLL]

Hi Folks,

I would like to build something from scratch, rather than a kit for my second project. I may even try acid etching a PCB for it. I'm not ready to design and build myself from scratch, so I'm looking for some plans. Does anyone know of any plans for a Morse oscillator using a 555 IC?

Thanks,

M6CLL

[G0CWA]

Hi Folks,

I would like to build something from scratch, rather than a kit for my second project. I may even try acid etching a PCB for it. I'm not ready to design and build myself from scratch, so I'm looking for some plans. Does anyone know of any plans for a Morse oscillator using a 555 IC?

Thanks,

M6CLL

Hi search for the 555 data sheet on line most manufacturers include a typical application circuit, some even give component values etc. Sorry I don't have one to hand.

You may find info on the RS site look for the 555 IC and then get the data sheet the 555 is a very useful little chip I would suggest using the TTL version NOT the Cmos one though as it's output power is higher and will drive either a piezzo-sounder or high impedance speaker directly.

Hope this helps, don't hesitate to contact me if I can help further
73 for now Nick G0CWA

[K8ERV]

555_Timer_Circuits.pdfHere is a very basic 555 oscillator, should work for a CPO.

TOM K8ERV Montrose Colo

[W4HAY]

Here ya go:

[W4HAY]

Once it's built, download these files and use them as a guide for proper element, letter, and word spacing.

[KD8DEY]

My buddy and I built a few back when I first got my ticket from the schematic I found on a website. The "Universal" IC board from Radio Shack works FB for this.
(mount a socket on the board in case you goof and blow the 555)

[KL7AJ]

555_Timer_Circuits.pdfHere is a very basic 555 oscillator, should work for a CPO.

TOM K8ERV Montrose Colo

Yep...use the TOY ORGAN project...it's got some wave shaping.

[K5UOS]

Hi Folks,

I would like to build something from scratch, rather than a kit for my second project. I may even try acid etching a PCB for it. I'm not ready to design and build myself from scratch, so I'm looking for some plans. Does anyone know of any plans for a Morse oscillator using a 555 IC?

Thanks,

M6CLL

Just because you mentioned the 555 timer IC: There was a 555 contest a while back.

http://www.555contest.com/

The entries are here:

http://www.555contest.com/news/

I have an electronic game for kids using a 555 timer that I used for homeschooling and cubscouts. It is just a very slow (like 1HZ) oscillator.

BLINK3.jpg


If you are not fixed on a 555 timer curcuit this is a good circuit for a code practice oscillator. I use it as a side tone for a transceiver. Nice enough tone.

TwinTSidetone.jpg


This circuit was a sidetone too: Simulates a UJT with two cheap transistors. Construction is not critical but has a rather hard sound.

100_0694.jpg


Whatever you choose have fun!

K5UOS

[K7ELP]

Here is a schematic of one I built a number of years ago. It uses a 555 as an oscillator and two integrators to convert the square wave to a sine wave and then uses a LM386 as an audio amplifer.
Any questions please contact me
73
Ned

[WB0RIO]

Most 555 code practice oscillators produce square waves, which will tire your ears out quickly.

You might want to check out my code practice oscillator / sidetone circuit here:
http://www.solorb.com/elect/hamcirc/sidetone/index.html
It produces sine wave tones with wave shaping, it's very easy on the ears.