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Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by Felipe Jimenez May 14, 2015
On Thursday, May 14, 2015 at 10:18:10 AM UTC-7, Phil Hobbs wrote:
> On 05/14/2015 01:12 PM, Phil Hobbs wrote: > > On 05/14/2015 01:04 PM, Felipe Jimenez wrote: > >> On Thursday, May 14, 2015 at 9:28:05 AM UTC-7, John Larkin wrote: > >>> On Thu, 14 May 2015 09:15:53 -0700 (PDT), George Herold > >>> <gherold@teachspin.com> wrote: > >>> > >>>> On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs > >>>> wrote: > >>>>> On 05/14/2015 11:50 AM, John Larkin wrote: > >>>>>> On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > >>>>>> <pcdhobbs@gmail.com> wrote: > >>>>>> > >>>>>>>> Oh and I'm fairly certain the non-inverting amplifier is > >>>>>>>> wired up correctly. Between switching back and forth from > >>>>>>>> the non-inverting to the inverting configuration several > >>>>>>>> times, I am fairly certain that both configurations were > >>>>>>>> wired up properly. > >>>>>>> > >>>>>>> Hmm... "several times" does make it sound like a solderless > >>>>>>> breadboard, as John suggested. Those things are slabs of > >>>>>>> misery, for sure. > >>>>>> > >>>>>> Someone deserves an IgNobel prize for inventing them. > >>>>> > >>>>> They work okay for making a PIC blink a LED, as long as they're > >>>>> new. > >>>>> > >>>>> Then of course somebody plugs in a resistor from an old reel > >>>>> without removing the residual adhesive, and two of the holes > >>>>> become flaky forever. Then the next resistor is maybe > >>>>> oversize, and bends the crappy metal fingers apart, and the one > >>>>> after that is corroded, and leaves semi-insulating dust all > >>>>> over the place.... > >>>>> > >>>>> Not to mention a couple of pF of capacitance between adjacent > >>>>> rows, and many nanohenries in series with all the (nastily > >>>>> daisy chained) grounds. > >>>>> > >>>>> Cheers > >>>>> > >>>>> Phil Hobbs > >>>>> > >>>>> > >>>>> -- Dr Philip C D Hobbs Principal Consultant ElectroOptical > >>>>> Innovations LLC Optics, Electro-optics, Photonics, Analog > >>>>> Electronics > >>>>> > >>>>> 160 North State Road #203 Briarcliff Manor NY 10510 > >>>>> > >>>>> hobbs at electrooptical dot net http://electrooptical.net > >>>> > >>>> Grin, I was laying out this little pressure circuit for testing > >>>> the other day, a few flaky connections later and I grabbed my > >>>> soldering iron and copper clad. > >>>> > >>>> I need to order more (copper clad) any decent sources? > >>>> > >>>> George H. > >>> > >>> ebay usually has tons. Or I can send you a few sheets. I might > >>> even include a bit of the gold stuff. > >>> > >>> https://dl.dropboxusercontent.com/u/53724080/Protos/Z356_EOM_Timer/Z356_Top.JPG > >>> > >>> > >>> > >>> > > https://dl.dropboxusercontent.com/u/53724080/Protos/Z338_PCB.JPG > >>> > >>> https://dl.dropboxusercontent.com/u/53724080/Protos/D200_BB_4.JPG > >>> > >>> > >> > >> Hey John...I'm always looking to improve my prototyping skills...What > >> do you use to cut away your copper on your prototypes? I just use a > >> razor and slice back and forth, but then I may create shorts when I > >> fill that part with solder. I see your prototypes have a pretty good > >> clearance when cutting away the copper to make isolated pads. > >> > > > > Serrated aviation snips (Wiss M3). They last for years. > > For making pads, you cut up small rectangles and glue them to the ground > plane. That makes good power supply bus bars, too. > > Cheers > > Phil Hobbs > > -- > Dr Philip C D Hobbs > Principal Consultant > ElectroOptical Innovations LLC > Optics, Electro-optics, Photonics, Analog Electronics > > 160 North State Road #203 > Briarcliff Manor NY 10510 > > hobbs at electrooptical dot net > http://electrooptical.net
That is true and I'll glue my surfboards onto the copper boards for ICs (when required), but I noticed John cut away his copper in a pretty nice fashion (along with gluing boards). As for me, I prefer to cut away copper for isolated pads instead of gluing a bunch of small pieces of copper to the board. Mainly because I never have glue around when I need it. And those serrated aviation clips. We have them and I hate them :) I can't cut straight long (several inches) pieces of copper board to save my life. Which is why I bought a cheap-o mighty mite table saw from harbor freight. But since I have to make a purchase for some lab supplies, I'll just buy a bulk of glue and be done with it.