[time-nuts] KD2BD WWVB receiver/decoder in QEX
paulswedb at gmail.com
Mon Nov 23 19:41:18 EST 2015
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
Ah the smell of burning insulation and flux in the evening.
On Mon, Nov 23, 2015 at 1:28 PM, paul swed <paulswedb at 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.
> On Mon, Nov 23, 2015 at 12:16 PM, Charles Steinmetz <csteinmetz at 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.)
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