CODE PRACTICE OSCILLATOR powered by any computer MIC JACK - no batteries needed - EVER -

Every computer MICROPHONE INPUT jack,  has its own voltage and current that is already built inside it, in order to power Electret Mics.  By modifying a very simple and low voltage square wave generator circuit to make use of this MIC VOLTAGE, a very simple and NO BATTERY NEEDED -  EVER -   code practice oscillator can be made using this circuit, the MIC JACK,  and  an AUDIO to MIDI technique to regenerate the original input cw tone from this LM3909 and convert it to an amazing sine wave shaped cw note.

 

 Here is the circuit used for this:

 

- HERE IS WHAT THIS OSCILLATOR SOUNDS LIKE -

Just like it sounds with no filtering and then by using AUDIO to MIDI technique to regenerate the tone

Views: 264

Tags: AUDIO to MIDI, LM3909, code practice oscillator, software CPO

Comment by Chuck aa0hw on February 24, 2014 at 4:34pm

HERE IS A VIDEO SHOWING A SIMILAR SETUP USING A MICRO POWERED LOW VOLT 555 CHIP

This video demonstrates an experimental setup for powering a CODE PRACTICE OSCILLATOR css555 MICRO POWER, LOW VOLTAGE TIMER circuit from just the voltage and current available at any sound card MIC JACK. This example is for a STEREO MIC jack. [ This technique will also work on a mono jack too, but the MONO MICROPHONE /css555 circuit is different and will be demonstrated in a follow up video later on in this series. ] The micro power and low voltage mode of the css555 timer chip is the key ingredient in this stereo mic powered CPO CIRCUIT. You are able to hook as many keyers, bugs, straight keys, etc, all at the same time, to this circuit to key this CPO. AUDIO to MIDI is used to regenerate the cw tones. A 15khz output tone from the css555 is utilized for maximum performance from the REAGATE VST PLUG for AUDIO to MIDI technique which outputs midi NOTE ON and NOTE OFF data, precisely duplicating the original length of the dits and dahs from the keyer(s) output, also pitch midi messages are delivered to the software CPO - SATYR, that is keyed by these midi messages.

NOTE: the voltage measurements on my mic jack were 2.2 volts - no load, and 1.6 volts with this circuit engaged in a "key down" condition.

HERE ARE THE LINKS MENTIONED IN THIS VIDEO:
1. css555 from JAMECO
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001...
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?lang...
http://www.jameco.com/Jameco/Products/ProdDS/2158733.pdf
2. Data sheet for the css555
http://www.customsiliconsolutions.com/downloads/Revised%20Standard%...
3. previous videos for AUDIO to MIDI setups for generating a cw sidetone:
A. https://www.youtube.com/watch?v=h0nmo3FlHxA
B. https://www.youtube.com/watch?v=OPeYsPfjPqg
C. https://www.youtube.com/watch?v=FavCoF8IIG4
D. https://www.youtube.com/watch?v=2B47s1_WXbo
3. SATYR VSTi PLUGIN
http://www.vstplanet.com/News/10/Satyr.htm
4. AUDIO to MIDI - REAGATE PLUGIN
http://www.kvraudio.com/product/reagate_by_cockos
http://www.reaper.fm/reaplugs/
5. JACKROUTER VIDEO DEMO
https://www.youtube.com/watch?v=h883l3PUJ50

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