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On Mon, 28 Jul 2003 22:52:21 +0100, Paul Burridge
wrote: Have a look here http://www.ife.tugraz.at/datashts/nsc/h7912.pdf You'll have to forgive me here, John, as i'm battling with a duff display on the computer I'm using at the moment and I was only able to glimpse the data for a few seconds, but this chip doesn't seem to be suitable for 40Mhz FM, does it? I'm sure your general solution to the problem is an excellent one, though, if a suitable chip can be found. -- Hello Paul, under Features on page 1 it says 50KHz to 72 MHz but not FM. I forgot about that. My mistake. OK we'll keep looking for something that suits your FM transmitter. Or find, beg, borrow, "buy used," or build an ordinary AM R/C transmitter. Ten quid should get you an old style metal cased Futaba transmitter. A model shop gave me the circuit diagram decades ago of an old JR brand transmitter that I bought off them in dud condition, cheap. Keep looking. That model shop/sanwa agency are a bit mean that is why I said dump their product. Stick with brands that will offer support and circuits. There is plenty of info with that LM1872 chip, that is what makes it attractive to use. Have Fun, John Crighton Sydney |
#3
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On Mon, 28 Jul 2003 22:52:21 +0100, Paul Burridge
wrote: Have a look here http://www.ife.tugraz.at/datashts/nsc/h7912.pdf You'll have to forgive me here, John, as i'm battling with a duff display on the computer I'm using at the moment and I was only able to glimpse the data for a few seconds, but this chip doesn't seem to be suitable for 40Mhz FM, does it? I'm sure your general solution to the problem is an excellent one, though, if a suitable chip can be found. -- Hello Paul, under Features on page 1 it says 50KHz to 72 MHz but not FM. I forgot about that. My mistake. OK we'll keep looking for something that suits your FM transmitter. Or find, beg, borrow, "buy used," or build an ordinary AM R/C transmitter. Ten quid should get you an old style metal cased Futaba transmitter. A model shop gave me the circuit diagram decades ago of an old JR brand transmitter that I bought off them in dud condition, cheap. Keep looking. That model shop/sanwa agency are a bit mean that is why I said dump their product. Stick with brands that will offer support and circuits. There is plenty of info with that LM1872 chip, that is what makes it attractive to use. Have Fun, John Crighton Sydney |
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