John T Rankin

US Patent:

42451663, Jan 13, 1981

Filed:

Mar 6, 1979

Appl. No.:

6/018248

Inventors:

John C. Rankin - Los Angeles CA

International Classification:

H03K 1772
H03K 1722
H03K 17292

US Classification:

307252N

Abstract:

A field effect transistor is used to short circuit the timing capacitor of a thyristor when power is interrupted or removed. The short circuiting of the timing capacitor prevents the residual capacitor charge from being added to a new charge after an interruption so that the early firing of the thyristor is avoided and component damage is prevented. Because capacitor charging always starts at zero voltage when the field effect transistor is used, hysteresis at low voltages is greatly improved.

US Patent:

41722370, Oct 23, 1979

Filed:

Dec 26, 1978

Appl. No.:

5/972952

Inventors:

John C. Rankin - Los Angeles CA

International Classification:

H03F 338

US Classification:

330 10

Abstract:

A transistor amplifier consisting of a modulated radio frequency generator and a detector circuit wherein the operating portion of the input-output curve of the radio frequency generator is a complement of the operating portion of the input-output curve of the detector circuit. The curvature of the radio frequency generator is controlled by variation in the current of a radio frequency voltage through a diode, changing the loading on a tuned circuit so that the amplifier may be adjusted for low, zero or negative harmonic distortion. The amplifier may be adjusted to compensate for distortion in equipment connected to its input terminals or distortion in equipment connected to its output terminals.

US Patent:

43152180, Feb 9, 1982

Filed:

Oct 12, 1979

Appl. No.:

6/084107

Inventors:

John C. Rankin - Los Angeles CA

International Classification:

H03K 513
H03K 2322

US Classification:

328 8

Abstract:

A field effect transistor is used to short circuit the timing capacitor of a gaseous tube when power is interrupted or removed. The short circuiting of the timing capacitor prevents the residual capacitor charge from being added to a new charge after an interruption so that the early firing of the gaseous tube is avoided and damage is prevented. Because capacitor charging always starts at zero voltage when the field effect transistor is used, hysteresis, at low voltage outputs, from the gaseous tubes is greatly improved.