Charles great suggestion on the NE5532. Just bread boarded the first section of the receiver very quickly and the component values work as is. Thats also as it should be. I need to do a noise check tomorrow but it appears I can heat up the ole soldering iron and build quite a bit of the receiver. Ah the smell of burning insulation and flux in the evening. Regards Paul WB8TSL
On Mon, Nov 23, 2015 at 1:28 PM, paul swed <paulsw...@gmail.com> wrote: > Charles I did see the slew rates and bandwidth and came to the conclusion > those were not issues. Thats why I will build up a test board pretty > quickly to confirm the component values still work. They should. It also > means I do not need to wait for the LM873s to showup. Lots can be wired > without the LMC6484s. > Regards > Paul > WB8TSL > > On Mon, Nov 23, 2015 at 12:16 PM, Charles Steinmetz <csteinm...@yandex.com > > wrote: > >> Paul wrote: >> >> post down conversion to 10 Khz I was scratching my head as to why not >>> the TL08X series. >>> >> >> Input voltage noise. Unless you need the low input current of the FET >> part, there is no need to take the noise hit. If you *do* need the low >> input current, there are 4 or 5 generations of FET-input opamps that are >> all far superior to the TL0xx parts. Take a look at the OPA134/2134/4134, >> for example. (I haven't used TL0xx opamps since the '70s.) >> >> BTW: I suggested using NE5532s instead of LM387s and said they were >> better in every way. Comparing the LM387 to the NE5532, one might notice >> that the bandwidth spec of the 5532 is lower (10MHz) than that of the 387 >> (15MHz). But what is important for most applications is not the >> small-signal BW, it is the power BW (full-output BW), which depends on the >> slew rate, not on the SSBW. The 5532's 9v/uS slew rate supports a PBW of >> 140kHz, while the 387's PBW is only 75kHz (S/R is not stated). (This tells >> us two things -- first, that the 387's slew rate must be <5v/uS; and >> second, that the 387 has less phase margin than the 5532.) >> >> >> Best regards, >> >> Charles >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
