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 Post subject: Re: A New $5 circuit for an AM Modulator and Generator
PostPosted: Apr Mon 12, 2021 1:24 am 
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Joined: Jun Sun 22, 2008 2:03 am
Posts: 1009
Location: Burke, VA 22015
Usually Lurking wrote:
I wonder if the modulation could be done by PWM of an otherwise squarewave output? This would eliminate any need for even a simple a DAC.


That's a good idea for low cost solution.

Tentative list of parts:
Pico board
R-2R array
Passive LPF for PWM output
Dual op-amp for AF and RF outputs
Long-channel JFET for AM modulation

There is no FM capability at this point.

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Binh


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 Post subject: Re: A New $5 circuit for an AM Modulator and Generator
PostPosted: Apr Mon 12, 2021 2:02 am 
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Joined: Jan Fri 02, 2009 11:32 pm
Posts: 725
Location: Equinunk PA 18417
Thank you Binh,

I look forward to watching this project progress.

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-Richard


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