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HF Transmitter #13 - More Boards! 

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I've finished two more circuit board assemblies for my HF transmitter project - the main board which contains the Arduino Nano controller, and a power distribution module, which also contains a CW side tone generator.
My thanks to Mike Maynard for sharing his CW audio tone generator design at www.k4icy.com
No endorsement is made nor implied to any commercial products referenced in this episode.

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16 фев 2023

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Комментарии : 4   
@Paul_VK3HN
@Paul_VK3HN Год назад
You're right about sidetone being harder than it looks. The easy way is to use Arduino built in tone function which toggles a digital line, then RC filter and attenuate. This eliminates the components but can sound harsh. Your scheme is good, as long as there's no leakage around the FET. one slight problem, the volume is fixed. In a transceiver you want the Sidetone thru the receivers audio stage and volume control. A different challenge. Your transmitter will be a high quality unit, thanks for sharing. Paul VK3HN.
@TheEmbeddedHobbyist
@TheEmbeddedHobbyist Год назад
Aa you don't need to receive data you could bit bang the output spi signals and it would free up a pin. Just a thought. Nice to see a star ground, you can feed each set of grounds through 0ohm links etc, on a pcb as that let's you give each ground a different net name.
@t1d100
@t1d100 Год назад
Super!
@yakovdavidovich7943
@yakovdavidovich7943 Год назад
You mentioned not being able to etch for a TSSOP footprint... if you're ever interested in home-making such things, I've had good success with TSSOP and MSOP footprints by CNC milling my boards. Solder mask isn't really necessary if you're good with flux and thoughtful about your footprint and layout. It's nice not to have to wait a week or two for a fancy board sometimes :-).
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