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Very Low cost, 2-250 MHz scalar network
analyzer with PC control (Synthetic instrument) - . . .
[Steve Hageman's Design Resource]
Very Low Noise Amplifier - The phase noise of low noise oscillators and signal sources is usually determined by
measuring the audio noise voltage at the output of the phase comparator in a phase-locked loop. The phase
comparator is typically a low noise doubly-balanced mixer with a phase slope from a few tenths of a volt per
radian to a few volts per radian. The low. . . [Charles Wenzel (unless otherwise noted)]
Vest Pocket VHF FM Test Generator - NOTE: Must register on this site. . . [Published in Elecktor July/Aug, 2010]
VHF signal generator - . . . [Sunamura Kazuhiro]
Victoreen 570 r-meter
manual w/schematic - . . .
Video Design Idea: Build your own laboratory precision voltage reference - 05/24/07 EDN Design Idea demonstrates an Amplifier-based circuit design for a relatively
inexpensive precision voltage source. . . [by Mark Thoren, Linear Technology, Milpitas, CA]
Video Design Idea: Measure nanoamps to ensure accurate computer clocks - 10-May-07 EDN Design Idea This EDN Video Design Idea explains why PC clocks are invariably
wrong, and how engineers can surmount the extreme measurement challenge involved in solving the problem. . . [by
Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a
stroke.]
Video DVM - A digital volt meter that displays voltages on your TV screen, with both giant digits and an
analogue bar display. Maximum and minimum peaks are displayed, too. Serial output for use as a data logger in
conjunction with your PC. . . . [Alberto Ricci Bitti]
Virtual instrument determines magnetic core's B-H-loop characteristics - 01/05/06 EDN Design Idea Inexpensive solution combines a laptop, DAQ card, and LabView. .
. [by Michael Nasab, Circuit Mentor, Boulder Creek, CA]
Vital-signs monitor consumes less than 50µA - 02/02/98 EDN Design Idea A remote data-acquisition circuit for monitoring a patient's
vital signs--pulse rate, respiration, and temperature--uses very little power as well as inexpensive sensors and
circuits (Figure 1). The. . . [by Leonard Schupak, Discovision Associates, Irvine, CA]
Volt Meter with Video Output - Video-DVM is a very cheap DVM that shows how an output as complex as a video composite
signal can be generated entirely in software: two I/O pins and three resistors are all the hardware required.
Connected to any TV set it displays voltages, included max and min peaks, using both giant digits and an analog
bar-display. A serial data output for computer data logging is provided, too. . . . [Alberto Ricci Bitto]
Voltage Boost to
Series Regulator provided by Capacitor - This circuit
adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal
operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts
out of a plug-in-the-wall power adapter power supply . . . [Hobby Circuit designed by Dave Johnson P.E.,
01/01/98]
Voltage follower with 1G ohm input resistance - . . . [by
IQ Technologies Industry, unless otherwise noted online]
Voltage Indicator - The solidstate voltmeter circuit described here indicates the mains voltage with a
resolution that is comparable to that of a general-purpose analogue voltmeter. The status of the mains voltage is
available in the form of an LED bar graph. . .
Voltage Inverter - This circuit inverts the polarity of the input. output is limited to less that 200mA. . . .
[Andy Wilson's site]
Voltage Inverter IC Forms High
Efficiency Rail Splitter - Application Note #218. . .
[Maxim Integrated]
Voltage Measurements
in Biomedical Research - Analog Devices-Analog Dialogue. .
. [by Franz, Rich]
Voltage Monitor - . . . [by IQ Technologies Industry, unless
otherwise noted online]
Voltage Monitor - This voltage monitor circuit is based on
an Elektor design with a 555 timer IC in the book 302 Circuits, which uses two LEDs (red and green) to indicate
whether the voltage is within range. must register on this site. . . [Published in Elecktor July/Aug, 2010]
Voltage Monitor - When the input voltage is 0 the LED glows. The LED stops glowing when the voltage rises to
the level determined by R2. Reverse + and, pins to reverse operating mode. To set voltage at which LED goes . .
.
Voltage Monitor for
a 9v Battery - Nine voltage batteries are used in a
wide variety of electronic devices. But, you often don’t know when it is time to change the battery until the
device stops operating. The hobby circuit below provides a visual indication when the battery needs to be . . .
[Hobby Circuit designed by David Johnson P.E., 07/09/06]
Voltage Monitor Prevents Deep Discharge of Battery - 09/26/96 EDN Design Idea To avoid the deep discharge that can destroy or shorten the life
of a rechargeable battery, you must disconnect its load before the discharge is complete. This disconnect
function requires a battery-voltage monitor, which must incorporate considerable hysteresis to prevent chatter in
the disconnect switch. The chatter occurs as the battery voltage first dips below threshold and then bounces back
on load removal. . . [by Ron Clark and Larry Suppan, Maxim Integrated Products]
Voltage Probe - . . . [Flavio Dellepiane's web site]
Voltage Recorder
With Playback (ATMEGA48V) - The recorder includes the
functionality of a data logger but also plays back recorded voltages and can perform a curve trace function. A
simple file system provides for up to 128 different sequential files totaling up to 130, 000 samples. At 1 sample
per minute, that's 90 days of continuous recording. . . [From Dick Cappels' project pages]
Voltage reference improves JFET
- 10/26/00 EDN Design Idea The common JFET current-source in Figure 1a has average output impedance and
depends heavily on the JFET's VP and IDSS variations. These manufacturing variations limit the initial accuracy
of the current setpoint that t. . . [by Clayton Grantham, National Semiconductor, Tucson, AZ]
Voltage timer monitors line connected AC loads - 08/16/07 EDN Design Idea A one-wire counter and an optoisolator keep track of the on-time
of an ac load. . . [by Michael Petersen, Maxim Integrated Products, Sunnyvale, CA]
Voltmeter + Ammeter LCD
panel - This multimeter was designed to measure output
voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the
negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional
function. . . [by IQ Technologies Industry, unless otherwise noted online]
Voltmeter Monitors TTL Supplies - Application Note. . . [National Semiconductor]
Volume Control - based on DS1669 Digital Pot IC. . . [Design by Aaron Cake]
Volume unit meter spans 60 dB dynamic range - 10-Nov-05
EDN Design Idea An audio volume-unit meter displays peak-related audio Amplitudes to aid in accurately setting
recording levels or for displaying an Amplifier's operating conditions. A simple diode and capacitor network
provides a classic volume-unit meter's peak-weighted response, but the circuit typically limits response to about
23 dB of displayable dynamic range, and the meter suffers from errors that its pointer's inertia and mechanical
"ballistics" introduce. Contemporary displays eliminate the inertia problem by using arrays of lighted elements
to form bar graphs, but any shortcomings in response and accuracy characteristics now shift to the
signal-processing domain. . . [by Jon Munson, Linear Technology Corp, Sunnyvale, CA]
VU & PPM Audio Metering - circuits using analog needle meters . . .
VU meter
- Dieses Stereo-VU-Meter ist sehr simpel aufgebaut und lässt sich einfach an
ein Line Audio-Signal hängen. Dann zeigt es den Signalpegel mit 10 Leuchtdioden pro Kanal an. Diese Schaltung hat
keinen Verstärker vorgeschaltet, weshalb der. . .
VU Meter (spelektoniikka) - 5 LED VU meter, in PDF format,
includes circuit board, text in Finnish . . .
VU Meter 3 - A very simple circuit of indication of level, with 10 Led. Is used the circuit of half-wave
rectification of precision round the IC2, with gain one. With switch S1, we can select the indication of Led. The
level of entry is 60 mV-1. 25 V. . .
VU Meter Amplifier - . . .
VU Stereo Meter - This project will indicate the volume level of the audio going to your speakers by lighting
up LEDS. The LEDs can be any color so mix them up and really make it look good. The input of the circuit is
connected to the speaker. . . [Randy Linscott]
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