Audio Guru FM TX

[MNA]

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?

 

[MNA]

Audio Guru FM TX circuit

View attachment 38958

 

[MNA]

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

 

[audioguru2]

I changed 330nF to 300nF

330nF is a very common film capacitor value.

IUsed 100 nF

For which capacitor?

and 5-35pF to 4-30pF.

That will be fine.

I was

 

[MNA]

Can a PLL digital tunning(DIP Switches)  crkt be added in any VCO tx? can it be done in this crkt ?

 

[audioguru2]

Can a PLL digital tunning(DIP Switches)