MNA Posted May 5, 2006 Report Share Posted May 5, 2006 Hi Audio and all,I implemented your circuit,Audio...but I changed 330nF to 300nF,Used 100 nF and 5-35pF to 4-30pF.....I was unable to find LM2931A 5.0 .....I used 7805(Is it ok??).....I heard a whistling sound!!! That whistling sound spoiled all the voice which i was transmitting...just i got an idea that voice has been received....Why is that whistling sound coming??? ....I am nearly not receiving the voice..... If it is not the parts replacement problem then can u give me an idea at what point to troubleshoot? Quote Link to comment Share on other sites More sharing options...
MNA Posted May 5, 2006 Author Report Share Posted May 5, 2006 Audio Guru FM TX circuit Quote Link to comment Share on other sites More sharing options...
MNA Posted May 7, 2006 Author Report Share Posted May 7, 2006 Audio,I think i didn't know how to do tuning and adjustment.....I asked someone and he told me ...... The Transmitter is working really good now....I haven't yet tried to measure the maximum range but has tried it with a good distance and transmission is good.... I tried this crkt to get the basics and it has really motivated me and I will be proceeding furthur with Xtal controlled transmitters etc......I don't think that I've to mention that u r too good :D Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 8, 2006 Report Share Posted May 8, 2006 I changed 330nF to 300nF330nF is a very common film capacitor value.IUsed 100 nFFor which capacitor? and 5-35pF to 4-30pF.That will be fine.I was Quote Link to comment Share on other sites More sharing options...
MNA Posted May 25, 2006 Author Report Share Posted May 25, 2006 Can a PLL digital tunning(DIP Switches) crkt be added in any VCO tx? can it be done in this crkt ? Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 26, 2006 Report Share Posted May 26, 2006 Can a PLL digital tunning(DIP Switches) Quote Link to comment Share on other sites More sharing options...
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