Newsgroups: alt.sci.physics.new-theories From: snet@world.std.com (Glenda M Stocks) Subject: FOGAL`S PATENT Message-ID: Organization: The World Public Access UNIX, Brookline, MA Date: Mon, 29 Aug 1994 17:34:07 GMT Lines: 76 25 Aug 94 19:02:02 By: Walter Bartoo To: Glenda Stocks Re: Fogal's patent ------------------------------------------------------------------------------ AREA:ORVOTRON_PRI > (From): BJORN@QUARK.LU.SE > (To) : ALL > System: SNET > Conf. : 0019 - PHYSICS > I have read through William J. Fogal's patent no 5196809 "High Gain, > Low Distortion Faster switching Transistor". What he claims is more > or > less that you can greatly improve the performance of a common-emitter > amplifier by parallelling the emitter-resistance with a "0.2uF to > 22uF > filter capacitor". He states that the gain increases with a 22uF > capacitor @1kHz (according to his measurements), which it does and > should since the gain of this circuit is given by -Rc/Re where Re is > the resistor // the capacitor and Xc decreases with increasing > frequency. However, he claims that the distortion and noise will > decrease dramatically when you use a "filter capacitor" instead of an > ordinary capacitor. Well, I've tried this simple circuit by first > using ordinary plastic and electrolytic caps (Al wet, Al dry and Ta) > and then by using what I thought was filter caps: 22uF bipolar for > loudspeaker-filters and 22uF low-impedance for switched power-supply > (ordinary low-imp, and sanyo's organic electrolyt) BUT (suprise > surprise) the result with these where identical with those of the > other caps, so my question is: > What is a "filter capacitor"?! > Regards >BJORN BILL RAMSAY HERE. RE; FOGAL DEVICE. The crucial aspect in providing for the effect is to locate the capacitor, whatever it is, as physically close to the Xstr. substrate as possible. The closer, the more profound the effect. Only certain types of Caps by their basic nature are most suitable. For example surface mount tantalums of very small size are best used. Such as 4.7mfd, 6vdc or less. Of course it is imperative to also use surface mount Xstrs. of the general purpose type equiv. to American 2N2222, ECG123AP, etc..(NPN). If technically feasable it is even desireable to CAREFULLY remove some of the epoxy on the device and cement the Cap. in place. Multi-layer Caps. are NOT useable. Hope this is helpful and that you have good experimental success. One last note----DO NOT exceed about .5 volts input since device saturates and starts behaving like a conventional Xstr. 470 ohms is a good value to use in parellel with cap.. Also (Hmmm. More than one last note.) The effect will only be noted with a fairly decent sine-wave input. The DC gain WILL remain the same. Otherwise, bias just like any NPN Xstr. 3 - 4 Volts is enough for collector, have fun. Do you know Dan Winter? If so will you be seeing him on his upcoming tour? And, if you're who I think you are, are you having any luck with Callahan's detector? Chow. Bill. > PS. If anyone's interested in the patent document, I could scan it > and > post it here as GIF-pictures (11 pages). DS * Origin: ** Spirit BBS - Orvotron ** (114:704/0) GLENDA STOCKS | FidoNet 1:330/201.0 SearchNet HeadQuarters | InterNet GS@rochgte.fidonet.org Snet Mailing List info, SEND | Data: 508-586-6977 / 617-961-4865 info snet-l TO | Download SEARCHNT.ZIP For Info! majordomo@world.std.com | Voicemail: +1-617-341-6114 Searchnet.zec@channel1.com | FidoNet CHANNELS, & I_UFO moderator * RM 1.3 00257 * I don't have a ride, so I'll walk... *POOF*