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V/I Curve Tracer - The V/I Curve Tracer is an indispensable tool
for troubleshooting circuits and testing components. The circuit traces the
current versus voltage curve for the component under test on an ordinary
oscilloscope. The peak-to-peak test voltage.... |
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VCR Tuner Based RF Spectrum Analyzer Schematic - file open slowly,
be patient.... |
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Versatile Zener Diode Tester - This circuit will test zener diodes
up to 56v. See Talking Electronics website, left index, 200 Transistor
Circuits (circuits 1-100) and go to Zener Diode (making) to see how to make
a zener diode and how to create a zener voltage from a combination of zeners.
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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....
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Vest Pocket VHF FM Test Generator - ….must register on this site....
[Published in Elecktor July/August 2010] |
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Victoreen 570 r-meter manual w/schematic - (circuit added 07/07/07)
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Video Design Idea: Measure nanoamps to ensure accurate computer clocks -
10-May-07 Issue of EDN This EDN Video Design Ideaexplains why PC clocks are invariably
wrong, and how engineers can surmount the extreme measurement challenge involved in
solving the problem.... [Design Idea by Jim Williams, staff scientist with
Linear Technology] |
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Virtual instrument determines magnetic core's B H loop characteristics -
5-Jan-06 Issue of EDN Inexpensive solution combines a laptop, DAQ card, and
LabView.... [Design Idea by Michael Nasab, Circuit Mentor, Boulder Creek, CA; Edited
by Brad Thompson and Fran Granville] |
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Virtual RF generator measures load impedance and power - 6-Mar-08 Issue of
EDN Using a virtual instrument, you can measure the power and impedance of
various loads.... [Design Idea by Michael Nasab, Circuit Mentor, Boulder Creek, CA] |
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Vital Signs Monitor Consumes Less than 50 µA - 02/02/98 EDN-Design
Ideas....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…. [Design Idea by Leonard
Schupak, Discovision Associates, Irvine, CA] |
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Volt Meter with Video Output - (electronic circuit added 09/05) |
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Voltage Inverter - (electronic circuit added 4/05) |
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Voltage Inverter IC Forms High Efficiency Rail Splitter - Maxim Application
Note #218 (app note added 5/08) |
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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 ….... |
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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/August 2010] |
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Voltage Monitor Prevents Deep Discharge of Battery - 05/07/98 EDN-Design
Ideas....NOTE Page includes several designs, scroll to find this one....mCs such
as the 8051 and 8096 and UARTs such as the 82510 provide hardware support for a
multiprocessor asynchronous serial-communication protocol (MicroLan]. This
feature is useful....(added 11/05] [Design Idea by Rolando Herrero, Instituto
Tecnologico de Buenos Aires, Argentina] |
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Voltage Probe - (circuit added 9/04) |
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Voltage reference improves JFET - 26-Oct-00 Issue of EDN-Design Ideas....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 the circuit can obtain with a fixed R1.
Most users of JFET current-sources sample VP....PDF has several circuits, scroll to
find this one.... [Design Idea by Clayton Grantham, National Semiconductor, Tucson,
AZ] |
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Voltage timer monitors line connected ac loads - 16-Aug-07 Issue of EDN
A one-wire counter and an optoisolator keep track of the on-time of an ac load....
[Design Idea by Michael Petersen, Maxim Integrated Products, Sunnyvale, CA] |
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Voltmeter - …. |
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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….... [Site is under
construction right now] |
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Voltmeter Monitors TTL Supplies - National Semiconductor Application Note
(app note added 2/06) |
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Volume Control (Aaron Cake) - based on DS1669 Digital Pot IC (added 5/02)
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VU & PPM Audio Metering - circuits using analog needle meters
(added 5/02) |
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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.... |
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VU Meter (spelektoniikka) - 5 led VU meter, in PDF format, includes circuit
board, text in Finnish (added 5/02) |
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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.... |
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VU Meter Amplifier - (electronic schematic / circuit added 4/02)
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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
….(added 05/02) |
Water Seepage Monitor
A while back I got a request from a company who needed a water seepage detector.
They wanted a device that ran on 24vac and detected water using a fully isolated
circuit. They wanted a circuit which switched off 24vac to a load when water was
detected. The circuit below performs this function. By changing the
phototransistor’s position in the detector circuit, the circuit logic can be changed
so the 24vac source can be turned on when water was detected. This might be
handy to activate a pump.....[circuit designed by Dave Johnson, P.E.] |
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Waterman S-10-A "Pocketscope" oscilloscope schematic - (circuit added
07/07/07) |
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Watt-Hour Meter using PIC16C923 & CS5460 - Microchip Application Note
Published 16-Oct-00 (app note added 2/06) |
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Wattmeter - The extra input B is for a later SWR brigde project, also the TX
serial output will be in use later. The uncalibrated signal response is: +1/-1 dB from
1MHz to 450MHz. Input SWR vill varry from 1.00 to 1.30, depending on input frequency.
To make the SWR this good, you need to assemble the input circuit correct and adjust
the capasitor. Input power range: -60 to +30dBm that is 1 nW to 1 Watt. …....
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Weighting Filter - Weighting filters are used to determine the "loudness" of
sounds, particularly noise. You can very much discuss and criticise sense and nonsense
of different weighting filters….(electronic schematic / circuit added 6/07)
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Whistle Responder - Beeps when hears your whistle A gadget suitable for
key-holders, games etc..... |
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White LED Life Tester - There are lots of white LEDs for sale these days.
Many eBay and electronic component surplus sales claim to sell some very bright
devices. Over the years I have purchased some of them to experiment with.
I also have purchased some products, which contain white LEDs. A major
disappointment for me was some LED night lights I bought from Costco. In just
three months of operation, the night lights I purchased were too dim to be of any use.
What I have discovered is that many of the LEDs.... [Hobby Corner Circuit by Dave
Johnson] |
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Wide-swing Variable Crystal Oscillator - amateur radio construction
projects…. [from Peter Parker's website] |
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Xmas Lights Tester - Like every year around the same time, I hurried to get
my Christmas tree all set up and the first thing we do when the tree is 'standing' we
like to hang the lights in the tree. Okay, better first test them before putting all
50 of them in the tree. Yep! Working beautifully. I started a carefully planned
organization of the lights so they would be evenly divided over the branches. Now the
second string of lights, tested, yep working. In the tree with them. Putting the plugs
into the receptacle and....oh no-- one series of them are on in full glory, all the
others are out. Annoyed I tried to 'fix them' by trying to push each bulb further into
their sockets. Still no go.…. [written by Jan Hamer] |
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XTal Tester - …. |
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XTAL-Controlled FM TX (V6) - My FM Wireless microphone V5 has been very
popular, both as a beginners project and as a kit. It is interesting that it has also
been the biggest cause of lots of e-mail, the most common question being How can I
make it crystal controlled?. The oscillator can be made crystal controlled; replace
the 2p7 with a 5th harmonic crystal. The oscillator will then be very stable, so
stable in fact, that it cannot even be modulated!This means that you could only use it
to send CW (morse code).... [from Harry Lythall's website] |
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Zener diode & MM ICs produce true broadband noise - 10/14/00 EDN-Design
Ideas....A broadband source of white noise can be useful for measuring and testing
communications equipment. The source in Figure 1 is simple and produces a large noise
signal at its output terminals. The circuit.... EDN is migrating links. This link is
not verified. Search the "title" + "EDN" for new link. |
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Zener Diode Tester - Here is a handy zener diode tester which tests zener
diodes with breakdown voltages extending up to 120 volts. The main advantage of this
circuit is that it works with a voltage as low as 6V DC and consumes less(added 10/05)
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Zener Diode Tester - This circuit will test zener diodes up to 56v. See
Talking Electronics website, left index, 200 Transistor Circuits (circuits 1-100) and
go to Zener Diode (making) to see how to make a zener diode and how to create a zener
voltage from a combination of zeners.... |
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Zener Diode Tester (Andy Collinson / Aleksander Dakic) - Using a single 555
Timer IC and a small transformer to generate a high voltage, this circuit will test
zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable
mode, the output at pin3 drives a small audio transformer such as the LT700....
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Zener test circuit serves as DC source - 25-Nov-04 Issue of EDN This Design
Idea describes a versatile test circuit for zener diodes after yet another misread
zener diode had infiltrated the ranks of 1N4148 diodes assembled on a pc board. As a
bonus, the circuit can serve as a moderate-voltage, power-limited adjustable dc
source. Although conventional multimeters' resistance ranges typically apply enough
voltage to forward-bias most diodes, few can drive a.... [Design Idea by John Jardine,
JJ Designs, West Yorkshire, UK] |
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