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Circuits, Page 11 Testers:
#'sA-BCDEF-GH-KLM-OPQ-RSTUV-Z Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits
Designed by Dave Johnson, P.E. :
RS232 Data Bus Status Indicator
This circuit indicates TXD and RXD activity. The thresholds are set at
plus 3 volts and minus 3 volts. (added 12/04)
RS232 Serial Interface Status Indicator
I designed this circuit many years ago and have used it several times since.
It uses a single logic IC to indicate the TXD and RXD line activity of a typical
RS-232 serial data communications link. The thresholds are set at plus 3
volts and minus 3 volts. Two dual color LEDs are used as indicator lights.
Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
Quickly find PC-Board shorts with low-cost tracer technique -
25-Nov-04 Issue of EDN A predominant failure mechanism for
production pc boards is shorted traces. Finding hidden shorts is often
time-consuming and frustrating. Typical techniques of cutting traces,
lifting pads, and "blowing" shorts are, at best, questionable because
they may affect the reliability of the circuit, and the ever-decreasing
geometries and lower voltage ICs make these practices tricky and
risky.... [Design Idea by Teno P Cipri, Engineering Expressions
Consulting]
Radar Speedometer - This circuit is a Digital Radar
Speedometer. It allows us to evaluate the speed of any object moving,
especially cars and other vehicles. The speed is calculated in
kilometers per hour (KPH). Its display has three digits. This
radar works with the laser reflexion. It sends laser radiation to the
object and this object reflects the laser radiation …. [Site is under
construction right now]
Radio Spectrum Monitor - This is an experimental project to analyze
radio band in FFT. (added 6/06)
Rain Detector (Aaron Cake) - This circuit uses a sensor made of a small
piece of etched PC board and a simple SCR circuit to detect rain and sound a
buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a
signal to a security system. (circuit / design added 8/03)
Rainbow LED indicates voltage with color - 7-Dec-04 Issue of EDN
Meters that indicate analog levels via a moving-pointer meter, a numeric display,
or a column of LEDs typically occupy considerable panel area and requirethan a
casual glance to read. An indicator lamp or LED takes little space but indicates
only an on or off condition. However, an unobtrusive LED that changes color as a
function of a measured value would enable an observer to easily asse.... [Design
Idea by David Prutchi, Impulse Dynamics, Haifa, Israel]
Real-world power tests-model FPGA’s thermal characteristics - 12-Apr-07
Issue of EDN Applying forward bias to parasitic diodes smokes out those
pesky thermal parameters.... [Design Idea by Jeremy Willden, Ad Hoc Electronics,
Pleasant Grove, UT; Edited by Charles H Small and Brad Thompson]
