--- In [email protected], "John H. Fisher" <[EMAIL PROTECTED]> wrote: > > Jean-Michel I have been studying your Avala SDR transceiver and it looks > like a wonderful project. Yes, I will be delighted to follow your > construction and development. I see Tasa uses 74HC4066's and NE5532's > all over the place. I would like to experiment with my own sampler > perhaps using this design. I don't know why softrock uses those other op > amps and multiplexers. I would like to try these AVALA parts. Do you > know what the considerations were or why the difference in parts. The > AVALA parts are certainly inexpensive and readily available, too. Thanks > for your thoughts :-) > > -- > Regards, > John
Hi John, the AVALA project is an intelligent design. I like to comment to your question: "Do you know what the considerations were or why the difference in parts." Not everywhere you have the possibility to purchase components like in USA. Not all parts are available, particularly in East Europe. To give you an example, not everywhere in Europe you can get the FST3253, while it maybe easier to get the FST3125. 74HCxxxx ICs are quite common and also the OPAs like NE5532 and NE5534 Their price is also quite cheap. Forget all those low noise and wide band OPAs with balanced input and output ... you will have to use 2x NE5534 or 5532 amplifiers to make one OPA1632. In a few words ... you have to use what you can "easily" purchase and few ... $$$$ needed for components. 73 Gian I7SWX
