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Rosemary's original test circuit is shown in the article she tried to have published in a refereed scientific journal, but the submission was always rejected. In the last 5 months, I have had extensive email correspondence, and numerous telephone...
A schematic diagram for a broadband QRP SWR metering circuit intended for use in a QRP antenna tuner. The circuit allows the user to press a momentary DPDT switch to observe an LED indicator while adjusting the capacitors of...
Circuit for applying a DC-coupled FM or PPM to a 555 configured as an oscillator. IC-1 is a Motorola MC-1374P, and IC-2 is a National LH0002C. L1 and L2 are Mouser Electronics #421IF200. C1 and C2 are silver mica...
This high-Q notch filter operates at 60 Hz and is based on the "Twin-T" design. It creates a significant notch in the response curve at approximately 59.7 Hz, effectively eliminating 60 Hz hum and noise from audio recordings or...
The FAN7710 Ballast Control IC for Compact Fluorescent Lamps, developed using Fairchild's unique high-voltage process and system-in-package (SiP) concept, enables the design of a simple and low-cost fluorescent lamp driver electronic project. The FAN7710 ballast control manages internal high-voltage...
An incandescent lamp operates with a two-wire connection and features a life extension open circuit. It has a longer warm-up time compared to other types of lamps, resulting in a significant delay before illumination. Upon closing the switch, a...
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