What circuit for computer audio out to key rig? - QRQcw2024-03-29T13:38:13Zhttps://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer?commentId=1993813%3AComment%3A3281&feed=yes&xn_auth=noHere is a LIVE DEMO of an Aud…tag:qrqcwnet.ning.com,2022-04-27:1993813:Comment:1348242022-04-27T19:25:35.962ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a LIVE DEMO of an Audio Derived CW Keying Switch Circuit KEYING a RIG's CW JACK</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/Xin03dMJ5Po?wmode=opaque" width="560"></iframe>
</p>
<p><span>SEUTP: in this demo, FLdigi is sending out a CW KEYING TONE at 1Khz using FLdigi's RT QSK feature/function the input of the SWITCH rectifies and doubles the VOLTAGE from FLdigi's output connected to the switch's input... the circuit stores the…</span></p>
<p>Here is a LIVE DEMO of an Audio Derived CW Keying Switch Circuit KEYING a RIG's CW JACK</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/Xin03dMJ5Po?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
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<p><span>SEUTP: in this demo, FLdigi is sending out a CW KEYING TONE at 1Khz using FLdigi's RT QSK feature/function the input of the SWITCH rectifies and doubles the VOLTAGE from FLdigi's output connected to the switch's input... the circuit stores the voltage doubling in a 1uF cap....when the circuit is receiving 1Khz TONEs from any CW KEYER, FLdigi in this case, the STORAGE CAP's voltage activates the BASE of an NPN Transistor and then the RIG's CW jack being connected to the COLLECTOR of that transistor, the CW JACK gets GROUNDed for every CW ELEMENT...thus keying the RIG's CW JACK</span></p> Here is another example of an…tag:qrqcwnet.ning.com,2022-02-02:1993813:Comment:1345332022-02-02T20:58:51.620ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is another example of an audio derived CW KEYING CIRCUIT, this time using a diode switch to key the RIG's CW JACK</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/RrrgyqoW_Zw?wmode=opaque" width="560"></iframe>
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<p><span>brief testing of FULL QSK keying of an ELECRAFT K3S at 65 wpm using FLdigi on a Raspberry pi 4, sending 2400hz CW AUDIO out of the PI's headphone jack to an audio derived CW Rig Keying Diode Switch circuit that keys…</span></p>
<p>Here is another example of an audio derived CW KEYING CIRCUIT, this time using a diode switch to key the RIG's CW JACK</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/RrrgyqoW_Zw?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
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<p><span>brief testing of FULL QSK keying of an ELECRAFT K3S at 65 wpm using FLdigi on a Raspberry pi 4, sending 2400hz CW AUDIO out of the PI's headphone jack to an audio derived CW Rig Keying Diode Switch circuit that keys the RIG's CW JACK</span></p>
<p><span>the circuit rectifies FLdigi's 2400 hertz CW audio and stores it in a 1uF CAP... and uses that voltage to forward bias a DIODE(for the length of the CW ELEMENT) that is connected across the RIG's CW JACK contacts(orientation of the DIODE is chosen so that the diode by itself, without any bias current, will not allow the RIG's CW JACK to "turn on" and key the rig...) [ diode ~ 1n4007 ]</span></p>
<p><span>QSK receive AUDIO is heard between letters at 65 wpm</span></p> Here is another example of ke…tag:qrqcwnet.ning.com,2022-02-01:1993813:Comment:1343562022-02-01T18:10:07.666ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is another example of keying an ELECRAFT K3S RIG - by an audio derived CW KEYING circuit - using a software CW KEYBOARD(YPLog in this example) and a Raspberry PI 4 headphone output jack</p>
<p><iframe allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/gLhlwrP5kzM?wmode=opaque" width="560"></iframe>
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<p><span>the Raspberry PI tested to have enough volume output at its own analogue audio output headphone jack - to activate an audio derived CW KEYING…</span></p>
<p>Here is another example of keying an ELECRAFT K3S RIG - by an audio derived CW KEYING circuit - using a software CW KEYBOARD(YPLog in this example) and a Raspberry PI 4 headphone output jack</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/gLhlwrP5kzM?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
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<p><span>the Raspberry PI tested to have enough volume output at its own analogue audio output headphone jack - to activate an audio derived CW KEYING circuit - that "grounds" the RIG's CW JACK</span></p>
<p><span>- rig used in this video demo is an ELECRAFT K3(S) with qrq+ mode engaged</span></p>
<p><span>- software CW Keyboard used in this video demo is YPLog(running via pi-apps WINE setup)</span></p>
<p><span>- the CW PITCH that seemed to work best to activate the CW KEYING CIRCUIT was 2400 hertz</span></p>
<p><span>The "key" to getting a PI to be able to key the RIG's CW JACK, because of its LOW AUDIO POWER OUTPUT from its headphone jack is picking the "right" audio transformer ratio...8 ohms(pi headphone jack) to 1000 ohms(AUDIO DERIVED CW KEYING CIRCUIT input) etc...</span></p> Here is another interesting…tag:qrqcwnet.ning.com,2021-06-15:1993813:Comment:1314322021-06-15T16:38:30.324ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p> Here is another interesting low cost circuit that might work well for an audio derived CW RIG Keying circuit:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/9095119865?profile=original" rel="noopener" target="_blank"><img class="align-full" src="https://storage.ning.com/topology/rest/1.0/file/get/9095119865?profile=RESIZE_710x"></img></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/9095119897?profile=original" rel="noopener" target="_blank"><img class="align-full" src="https://storage.ning.com/topology/rest/1.0/file/get/9095119897?profile=RESIZE_710x"></img></a></p>
<p>FROM: …</p>
<p> Here is another interesting low cost circuit that might work well for an audio derived CW RIG Keying circuit:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/9095119865?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/9095119865?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/9095119897?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/9095119897?profile=RESIZE_710x" class="align-full"/></a></p>
<p>FROM: <a href="https://web.eecs.umich.edu/~prabal/pubs/papers/kuo10hijack-islped.pdf" target="_blank" rel="noopener">https://web.eecs.umich.edu/~prabal/pubs/papers/kuo10hijack-islped.pdf</a></p>
<p></p>
<p>take a look here too...i think the FETs used in this article are no longer being made... however, there may be some help here -</p>
<p><a href="https://www.diodes.com/assets/Datasheets/ZXM62N03E6.pdf" target="_blank" rel="noopener">https://www.diodes.com/assets/Datasheets/ZXM62N03E6.pdf</a></p>
<p> <a href="https://www.mouser.com/ProductDetail/Diodes-Incorporated/ZXMN3A01E6TA?qs=rI7uf1IzohR8cWEQH6fLkA%3D%3D" target="_blank" rel="noopener">https://www.mouser.com/ProductDetail/Diodes-Incorporated/ZXMN3A01E6...</a></p> Here is a LIVE DEMO of using…tag:qrqcwnet.ning.com,2020-02-11:1993813:Comment:389372020-02-11T20:32:51.928ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a LIVE DEMO of using the full wave doubler circuit with a MOUSER 8 ohm to 200 ohm input transformer - this is a REMOTE CW setup, where a Low Power AM transmitter(1630 Khz) is modulated at the remote OP's desktop by the audio output of a CW KEYBOARD, and an AM RADIO RECEIVER's audio output headphone jack by the RIG is used to FEED the AUDIO DERIVED CW keying circuit input, keyed at 50 wpm…</p>
<p></p>
<p>Here is a LIVE DEMO of using the full wave doubler circuit with a MOUSER 8 ohm to 200 ohm input transformer - this is a REMOTE CW setup, where a Low Power AM transmitter(1630 Khz) is modulated at the remote OP's desktop by the audio output of a CW KEYBOARD, and an AM RADIO RECEIVER's audio output headphone jack by the RIG is used to FEED the AUDIO DERIVED CW keying circuit input, keyed at 50 wpm</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/AyDJvROQ9lE?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
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<p>using a low power AM transmitter circuit to modulate with CW AUDIO from a CW KEYBOARD...transmitting at 1630 Khz, to a "rig side" AM RADIO Receiver(GE SUPERRADIO II)...where the AM RADIO's audio output is connected to an AUDIO DERIVED CW Keying Circuit's input<br/><br/></p>
<p>- this video demo's remotely keying CW on an Elecraft K3S at 50 wpm</p>
<p><a href="http://www.techlib.com/electronics/amxmit.htm" target="_blank">http://www.techlib.com/electronics/amxmit.htm</a></p> Here is a video demo of testi…tag:qrqcwnet.ning.com,2020-02-10:1993813:Comment:388352020-02-10T19:58:37.456ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a video demo of testing these kind of circuits to key CW on a RIG to find the "best" audio pitch & volume</p>
<p><iframe allowfullscreen="" frameborder="0" height="267" src="https://www.youtube.com/embed/4Fqp_SIgt1Q?wmode=opaque" width="475"></iframe>
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<p>AUDIO DERIVED CW KEYING CIRCUIT - (what audio frequency to use)</p>
<p>Finding the "best" audio pitch to generate the most voltage from this passive circuit - sent to this circuit from a software CW Keyer's audio PC sound…</p>
<p>Here is a video demo of testing these kind of circuits to key CW on a RIG to find the "best" audio pitch & volume</p>
<p><iframe width="475" height="267" src="https://www.youtube.com/embed/4Fqp_SIgt1Q?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p>AUDIO DERIVED CW KEYING CIRCUIT - (what audio frequency to use)</p>
<p>Finding the "best" audio pitch to generate the most voltage from this passive circuit - sent to this circuit from a software CW Keyer's audio PC sound card output</p>
<p>2k load on the TRANSISTOR that grounds the RIG's CW JACK...<br/>when it is turned 'on' by the audio at the circuits input stage.</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/3QCXDz5sKD4?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
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<p>AUDIO DERIVED CW KEYING CIRCUIT</p>
<p>finding the "best" amount of volume ... <br/> too much = ~ heavier keying<br/> too little = ~ lighter keying</p>
<p>the green wave is the cw keyboards output wave, the RED WAVE is what is being transmitted by the rig from being keyed by the audio derived cw keying circuit shown in the webcam view above on the breadboard...there is an 8ohm to 200 @ ohm isolation transformer at the input yellow with the green clip leads etc... the AD5DZ CW KEYBOARD also has an adjustment for compensation you can increase or decrease the length of the cw elements so between the two settings of volume and compensation...you can dial in how heavy or light you want the rig to sound</p> Just a note on how the audio…tag:qrqcwnet.ning.com,2017-04-06:1993813:Comment:292482017-04-06T22:32:35.436ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Just a note on how the audio volume effects the Audio Derived CW keying circuits output to KEY the cw jack of a rig...too much volume into the switch, your cw elements will be longer than the original, too little volume into the switch, your cw elements will be shorter than the original...this is a picture of the original DIT sent by a cw keyboard(top), to the AUDIO DERIVED CW KEYING CIRCUIT SWITCH, and on the bottom is the sidetone output from the Elecraft K3S CW SIDETONE MONITOR,…</p>
<p>Just a note on how the audio volume effects the Audio Derived CW keying circuits output to KEY the cw jack of a rig...too much volume into the switch, your cw elements will be longer than the original, too little volume into the switch, your cw elements will be shorter than the original...this is a picture of the original DIT sent by a cw keyboard(top), to the AUDIO DERIVED CW KEYING CIRCUIT SWITCH, and on the bottom is the sidetone output from the Elecraft K3S CW SIDETONE MONITOR, showing an exact replica of the original length of the dit element....</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127150672?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127150672?profile=original" width="339" class="align-full"/></a></p> Measure the input and output…tag:qrqcwnet.ning.com,2013-04-30:1993813:Comment:194702013-04-30T17:38:21.108ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p style="text-align: center;"><span style="text-decoration: underline;"><strong>Measure the input and output impedance of your own setup using this online calculator</strong></span></p>
<p style="text-align: center;"><a href="http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm" target="_blank">http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm…</a></p>
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<p style="text-align: center;"><span style="text-decoration: underline;"><strong>Measure the input and output impedance of your own setup using this online calculator</strong></span></p>
<p style="text-align: center;"><a href="http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm" target="_blank">http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm</a></p>
<p style="text-align: center;"></p>
<p style="text-align: center;"><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127147457?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127147457?profile=original" width="644" class="align-center"/></a></p>
<p style="text-align: center;"></p>
<p style="text-align: center;"><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127147597?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127147597?profile=original" width="671" class="align-center"/></a></p>
<p style="text-align: center;"></p>
<p style="text-align: center;">Here are measurements of the output impedance of some of my sound cards using this calculator:</p>
<p style="text-align: left;"></p>
<p style="text-align: left;">BEHRINGER UCA222 headphone output - 63 ohms</p>
<p style="text-align: left;">BEHRINGER UCA222 LINE OUT - 560 ohms</p>
<p style="text-align: left;"></p>
<p style="text-align: left;">SOUNDBLASTER MP3+ USB LINE OUT - 108 ohms</p>
<p style="text-align: left;">SOUNDBLASTER MP3+ headphone output - 83 ohms</p>
<p style="text-align: left;"></p>
<p style="text-align: left;">AUDIGY PCI SOUNDCARD OUTPUT - 32 ohms</p>
<p style="text-align: left;"></p>
<p style="text-align: left;">TURTLE BEACH USB OUT/has amp - 3 ohms</p>
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<p style="text-align: left;">As you can see from these results, there is quite a variance in the output impedance of different sound cards. </p>
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<p style="text-align: left;">On my BEHRINGER UCA222, LINE OUT , RCA jacks, I was able to (barely) key the switch using a 1/1 ratio- 600ohm - audio transformer with FLdigi set to zero db attenuation. However, If I added even just one db of attenuation, the switch would not work. </p>
<p style="text-align: left;"></p>
<p style="text-align: left;">By far the best results I have had in using an audio derived cw keying switch circuit - is using a 2nd sound card, a USB SOUND CARD, that has an audio amplifier included in its design. A SIIG SOUNDWAVE 7 did a great job for me and has plenty of audio power to work with this switch. I used a radio shack 8ohm to 1k ohm audio transformer for the interface when using this sound card due to the impedance involved; the SIIG USB SOUNDCARD impedance was very low at 3 ohms.</p>
<p style="text-align: center;"><a href="http://www.siig.com/it-products/multimedia/sound/usb/usb-soundwave-7-1.html" target="_blank">http://www.siig.com/it-products/multimedia/sound/usb/usb-soundwave-...</a></p>
<p style="text-align: left;"><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127147659?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127147659?profile=original" width="300" class="align-center"/></a></p>
<p style="text-align: left;"> </p>
<p style="text-align: center;"></p> HERE IS A GOOD EXAMPLE OF KEY…tag:qrqcwnet.ning.com,2013-04-29:1993813:Comment:196642013-04-29T16:31:53.221ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p style="text-align: center;">HERE IS A GOOD EXAMPLE OF KEYING A CODE PRACTICE OSCILLATOR USING THE FLDIGI QSK ON RT CHANNEL FEATURE</p>
<p style="text-align: center;"><iframe frameborder="no" height="166" src="https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F90012226" width="100%"></iframe>
</p>
<p style="text-align: center;"></p>
<p style="text-align: left;"><span>This audio file demonstrates FLdigi's QSK FEATURE, on the RT CHANNEL, keying an old HEATHKIT CODE…</span></p>
<p style="text-align: center;">HERE IS A GOOD EXAMPLE OF KEYING A CODE PRACTICE OSCILLATOR USING THE FLDIGI QSK ON RT CHANNEL FEATURE</p>
<p style="text-align: center;"><iframe width="100%" height="166" frameborder="no" src="https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F90012226"></iframe>
</p>
<p style="text-align: center;"></p>
<p style="text-align: left;"><span>This audio file demonstrates FLdigi's QSK FEATURE, on the RT CHANNEL, keying an old HEATHKIT CODE PRACTICE OSCILLATOR at about 75 wpm. The POST KEYDOWN timing, on the QSK CONTROL SCREEN, was set to minus 7 milliseconds [-7ms]. (You may notice a lighter keying from this setting.) The POST KEYDOWN TIMING is quite adjustable however, and you can make the "keyed" cw on the target hardware, whether it is your own RIG or an external CPO, to be as light or heavy as you desire. The text was taken from TOM's, W4BQF, famous qrq cw article, COPYING CW OVER 70 WPM. FLdigi does a great job of reproducing the exact, intended cw parameters by using an audio derived cw keying circuit.</span></p>
<p style="text-align: center;"><span><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127147618?profile=original" target="_self"><img width="400" src="http://storage.ning.com/topology/rest/1.0/file/get/3127147618?profile=RESIZE_480x480" width="400" class="align-full"/></a></span></p> Here is a picture of FLdigi's…tag:qrqcwnet.ning.com,2013-04-27:1993813:Comment:194632013-04-27T14:19:00.603ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a picture of FLdigi's audio derived keying voltage compared to the actual RF output of my rig. FLdigi does a great job of producing the exact cw element lengths using its QSK FUNCTION for audio derived cw keying.</p>
<p dir="ltr"><span>NOTE: <strong>this is not AFCW mode,</strong></span></p>
<p dir="ltr"><span>this is typical cw mode, and my rig’s own cw waveform with a short rise time and exponential wave construction...the picture came out blurry but still shows the accuracy of…</span></p>
<p>Here is a picture of FLdigi's audio derived keying voltage compared to the actual RF output of my rig. FLdigi does a great job of producing the exact cw element lengths using its QSK FUNCTION for audio derived cw keying.</p>
<p dir="ltr"><span>NOTE: <strong>this is not AFCW mode,</strong></span></p>
<p dir="ltr"><span>this is typical cw mode, and my rig’s own cw waveform with a short rise time and exponential wave construction...the picture came out blurry but still shows the accuracy of FLdigi in audio derived mode </span>keying the cw jack of my rig with the audio derived switch</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127147900?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3127147900?profile=RESIZE_1024x1024" width="721" class="align-center"/></a></p>