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Trancid
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I'm currently doing Electronics at the University of Eindhoven (Netherlands) and we need to make an AM demodulator (input signal lays between 875 and 915 kHz). We have made some sort of circuit (two to be exactly), but we are questioning the accuracy of this demodulator.
The main problem is we cannot use most of the normal ICs, however, we may use opamps and a Voltagesource (+15V...-15V).
One of the circuits we had designed was the input signal going through a diode and the outcoming signal is split by two condensators (one going to ground, the other delivers the outputsignal. This is somewhat inaccurate when there are big jumps between different freqs (the output signal is an audiosignal between 60Hz - 20 kHz).
Schematic:
The othere circuit can be found at http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/amfmdet.html (the first circuit).
Like I said before, we doubt the accuracy of these demodulators. We don't need the values of the components. So if you can point out certain disadvantages or advantages of even new circuits, please do so. But keep in mind, no ICs...
Thanks for any help, Patrick
The main problem is we cannot use most of the normal ICs, however, we may use opamps and a Voltagesource (+15V...-15V).
One of the circuits we had designed was the input signal going through a diode and the outcoming signal is split by two condensators (one going to ground, the other delivers the outputsignal. This is somewhat inaccurate when there are big jumps between different freqs (the output signal is an audiosignal between 60Hz - 20 kHz).
Schematic:
Code:
in ----- (diode) ------- (condensator) ---- out
|
|
(condensator)
|
(ground)
Like I said before, we doubt the accuracy of these demodulators. We don't need the values of the components. So if you can point out certain disadvantages or advantages of even new circuits, please do so. But keep in mind, no ICs...
Thanks for any help, Patrick
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