Hi again,
Well how bad do you want to build this thing? Maybe one of us here could get the FET's and mail a few to you. Would that be enough to get the thing built?
Wow............ It would be extremly happy moment if I got these few!!!
Almost a year ago I made this (attached) basic FM Tx designed by audioguru. I made few other Tx too as an experiment but this one has VERY crystal clear sound like a professional radio. But sound was little small than professional radio. I didn't know about such limiter/compressor so I experimented lot more with audio amplifier stage of the Tx, simulated with different bias, applied differents voltages, used differents transistors, even I used a 1000 hFE transistor MPSA18; But got nothing more than distortion. Later audioguru said about compressing audio to trasnmit loud audio. Very later I found few circuits on internet, made me excited to do! Excited to see its comprecessed and bypassed audio spectrum on computer screen by making it myself, wow! It would be cool thing to me. In past I asked 100ths of questions to audioguru and learnt lot more, sometime he was irritated too by my childish questions hehehe.
I was much more excited to make "stereo encoder" but after searching 3 years I made my hands up (same components problem).
Anyway, In real- I didn't find the jFET anywhere in past days too. But when I sent an email to a local distributor of Kathmandu (capital city), they said "we have only TL072 ICs, not others", then I stopped once in past.
Kathmandu is far and no home delivery service is stablished here in such rural places of mine. There is a friend who can buy few TL072 but he will not return soon, only after 7/8 months later he can buy them (he is out of Kathmandu now so). Currently, I have two pieces of LM358 opamp but most of experts said that it is not good opamp for audio purpose which can create hiss.
So in conclusion- to find jFET (2N5459 or any) is 'impossible' and to find TL072 is 'hard'. If it is not bad to request few things then along with jFETs I would request these things too-
- few pieces of TL072
- few pieces of high value resistors like: 1M, 2M2, 3M9, 4M7... I need 1M and 3M9 resistors here on this Limiter too. I didn't find such Meg resistors in past so searched hardly on old TVs or radios' circuit.
But, if it is hard to manage and send these additional things, I will manage myself by taking even long time as I said before- more than 8 months, maximum a year. Almost I have an addiction of searching components, so searching unavailable components from 4 years. That is why each semiconductor has very high important on my life. I have bought more than 100 pieces of general purposes BJTs which I can find here. Sorry for long text.
Thank you lot!!!