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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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20th February 2004, 04:12 PM
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 how to set the center frequency of LM567??? I have followed the data sheet of LM567 to build up a circuit to encode 10kHz input singal, but it doesn't work........ :cry: I used R1=2k, C1=47nF, 0.1uF and 0.01uF at pin 1 and pin 2. It seems no center frequency appeard, all input signals with different frequencies have the similar value of output voltage.......... What can I do??? Did I make any mistake??? Please help me.... :wink: | |
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21st February 2004, 01:18 AM
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| The bandwidth is way too wide. Try 2000 uF at pin 2. For 10% bandwidth, 0.1 = 1070*sqrt(vin/Fo/C2) (9.3*10^-5)^2 = vin/Fo/C2 Let vin =0.2 & Fo = 10^4 then 87*10^-10 = .2/10^4/C2 C2 = .2*10^-4/.87*10^-8 = .23 *10^4 uF
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21st February 2004, 08:42 AM
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| o, thanks~ but what is Vi? is it the supply voltage of the circuit of the encoder?? :roll: | |
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21st February 2004, 02:58 PM
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| Vin is the amplitude of the signal input to the 567. I don't know why it affects the bandwidth.
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