one issue we had with the 1n34 diode was that RF sometimes would burn 
it out. :)

At 11:09 PM 11/11/2015, you wrote:
>hmmm. well, a simple pre-amp wouldn't be hard. its just a simple =
>emitter-follower (high impedance input and about 3 or 4 parts).
>
>DE n7zzt Eric
>
>On Nov 11, 2015, at 10:35 PM, Tom Fowle wrote:
>
> > Eric
> > If you're referring to the "ADAM", as you say it takes several volts =
>of R.F.
> > We suggested improvements, but they weren't interested.
> >=20
> > Without a pre-amp, a 555 needs about 1/3Rd of VCC to shift it's freq.
> > tom WA6IVG
> >=20
> > On Wed, Nov 11, 2015 at 09:55:54PM -0700, Eric Oyen wrote:
> >> actually, there is another design that will work. it just requires a =
>555 =3D
> >> timer IC, about 10 or 11 parts and a 9 volt battery. One of the parts =
>=3D
> >> can be a piezon-electric transducer. There is a audio watt meter that =
>=3D
> >> uses something like this. However, its design is not sensitive enough =
>to =3D
> >> function as a field strength meter. I might get hold of the maker of =
>it =3D
> >> and suggest some designs he might look at.
> >>=20
> >> DE n7zzt Eric
> >>=20
> >> On Nov 11, 2015, at 8:48 PM, Tom Fowle wrote:
> >>=20
> >>> Ed,
> >>> Yeah I know you don't want to build, but since I don't know of a =3D
> >> commercial
> >>> device, there is at least one design in the
> >>> Smith-Kettlewell Technical File
> >>> http://legacy.ski.org/rehab/sktf/index.html
> >>> It's based on a very old circuit from the braille technical press =
>days
> >>> called "audio gimmick"
> >>> two transistors a simple audio transformer and a few parts.=3D20
> >>> Look for the article called=3D20
> >>> "gimmicks old and new" I think that's where you'll find the field =3D
> >> strength
> >>> meter.
> >>> =3D20
> >>> Let me know if you can't find it and care <GRIN>
> >>> 73
> >>> tom Fowle WA6IVG
> >>> =3D20
> >>> On Wed, Nov 11, 2015 at 03:27:40PM -0700, Ed Malmgren wrote:
> >>>> Where can a person get a field strength meter, audio of corse.  I =
>am =3D
> >> not in=3D20
> >>>> the moode to build things other than antennas any more? Could it be =
>=3D
> >> lazy or=3D20
> >>>> have I done too much of those kind of things hi hi.  73
> >>>> =3D20
> >>>> ED K7UC=3D20