Richard,
I did not mean disrespect, my surprise was at the need for 4 dual rail powe=
r supplies.

With the technology available now, you can do with a single rail even for a=
nalog signals.
A lot of op amps now can run rail to rail output with 5V or even 3.3V.
I suppose your project has more stuff than just a counter and display.
Unless you really need a DC component on your measurements, a single rail o=
p amp with AC coupling and bias at midpoint will do the job.

Jean-Paul
AC9GH


On Jul 25, 2014, at 12:07 PM, Richard R. Pope <mechanic_2@charter.net> wrot=
e:

> Jean-Paul,
>     Thanks, for the complement. Please watch the language. The pictures=20
> are posted here:
> https://groups.yahoo.com/neo/groups/TekScopes/photos/albums/147414244
>     Because I do circuit designs with op-amps.
> rich!
>=20
> On 7/25/2014 10:59 AM, Jean-Paul Louis wrote:
>> Hello Rich,
>>=20
>> Nice work description. But I am curious about the 4 different voltages t=
hat you use.
>> Why in hell do you need +/-5V AND +/-12V?
>> Where did you upload the pictures?
>>=20
>> Jean-Paul
>> AC9GH
>>=20
>> On Jul 25, 2014, at 11:14 AM, Richard R. Pope <mechanic_2@charter.net> w=
rote:
>>=20
>>> Hello all,
>>>     I just posted some pictures showing my lab and the frequency
>>> counter that I am building. Keep in mind that this is just the
>>> prototyping stage. I complete a section, build a test setup, and then g=
o
>>> on to the next section. The display board that is mounted to the larger
>>> board is completed. The larger board is just a test fixture that I will
>>> disassemble once I am finished with it.
>>>=20
>=20
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