A quick Google for “Freqbox” gives the following URL:
Clicking on the picture leads you to a site where you can buy a Freqbox of a different kind!
Edit: Just fixed the URL and don’t worry, it’s not too dodgy! 
Hmmmm… Don’t you mean “Freak” box? 
-andrew bunny
well, they said the mood freq was shipping now.
don’t try both boxes together…
Dr. Clark’s Zapper circuit has a natural analog sweep that will start at about 28 kHz and slowly climbs to about 32 kHz hitting many desirable frequencies in between during a single zapping session.
Oscillator drift??
"In earlier books a circuit was described that produced a totally Positive electrical field at all times, called “Positive offset”. But many zappers were built with small substitutions when the exact components were not available. This often brought the resulting electrical field too close to Negative so that brief excursions into the Negative field were inevitable. Even very brief “Negative spikes” are undesirable. For this reason the circuit given here has an additional component, a Positive offset resistor.
Or you could use an old one with the CP-251 mixer offset!
Many Zappers out there seem to have some modification that in one way or another deviates from Dr. Hulda Clark’s published design. For instance there are zappers out there that are digital, and Dr. Clark’s design is Analog
Good for us analog freqs!
Can I build my own Zapper? Yes, it’s rather easy to build your own zapper. If you have a few basic tools and consider yourself to be a bit handy, building a zapper will be great fun. Get enough electronic parts to make one for all your family members, handmade zappers make great gifts. There are several web sites with instructions, kits, and parts to make your very own Hulda Clark Zapper.
I don’t know about you guys, but I’m gonna go with the Moog.