A selection of circuits and ideas for your perusal. Some are original, and others plagurized from elsewhere. In any event the use of them is at your own risk. No responsibility is offered or accepted from your use of them.
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Very simple audio attenuation for soundcard / txcvr use etc |
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AF derived PTT circuit from sound output from soundcard for PSK etc |
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AF compressor based upon the SSM2165 ic. PDF data sheet listed below this item |
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AMD Data sheet for the above SSM2165 in PDF format |
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AF AGC based on the TLO81 op amp |
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A non ground isolated method of using the 3.5mm audio jack on the FT847 for PSK etc. |
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High Pass Filter for use where intermod is a problem when using 144 or 432 MHZ. |
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IC706 Auto Tune circuit by G4FZN |
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Icom CI-V interface circuit with ptt, and cw key option |
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Icom CI-V interface circuit with ptt. Using MAX232 IC. |
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Mic Pre-Amp with tone controls. Excellent for electret inserts. Based upon ARRL circuit |
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Pulsed Tone Tune . Used to be called the woodpecker, it can be used to tune auto atu's etc |
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Pseudo Stereo CW....A project which gives a "Spatial" effect when copying CW |
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Simple Speaker Muting Circuit For Use With Soundcard Software's Like MMSSTV Etc |
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Simple circuits for switching a linear etc. |
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Simple variable voltage dc power supply 1.2 to 24V at 1.5A |
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T Notch AF Filter..Try it out in series with your rx audio line to soundcard. Bust QRM |
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Using DTR to switch on a radio cooling fan with EchoTime software |
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Very simple audio attenuation for soundcard / txcvr use etc |
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Yaesu interface circuit with ptt. Using MAX232 IC. |
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The Minisynth VFO From Ham Radio Today By G4JST And G3WPO Another Classic |
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"Arguing with an engineer is like mud wrestling with a pig; After a while you realise you are getting muddy, and the pig is enjoying it"
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CIRCUITS