Hi Guys,
There are some cheap AM/FM pocket radios with LCD screens telling the tuned
frequency to the user, but without any PLL.
They still have variable tuning capacitors.
http://www.jaycar.com.au/productView.asp?ID=AR1741
My question is how do they know the frequency they are tuned to?
I thought maybe using the tuning capacitor,
but other connections to it would interfere with the radio.
Maybe there is a spare capacitor gang in the tuner.
Also thought the value off the tuner would be a bit small to use a resistor
to time the discharge of the tuning capacitor.
Thanks, Art.
There are some cheap AM/FM pocket radios with LCD screens telling the tuned
frequency to the user, but without any PLL.
They still have variable tuning capacitors.
http://www.jaycar.com.au/productView.asp?ID=AR1741
My question is how do they know the frequency they are tuned to?
I thought maybe using the tuning capacitor,
but other connections to it would interfere with the radio.
Maybe there is a spare capacitor gang in the tuner.
Also thought the value off the tuner would be a bit small to use a resistor
to time the discharge of the tuning capacitor.
Thanks, Art.
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