|
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....(added 08/08/08) |
|
VCR Tuner Based RF Spectrum Analyzer Schematic - file open slowly, be patient.
(diagram added 05/07) |
|
Versatile Zener Diode Tester - 11/25/04 EDN-Design Ideas: This 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....(electronic Circuit / Schematic.....(design idea added 12/04) |
|
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.... (added 7/03) |
|
Victoreen 570 r-meter manual w/schematic - (circuit added 07/07/07) |
|
Video Design Idea: Measure nanoamps to ensure accurate computer clocks - 05/10/07
EDN-Design Ideas: In this EDN Video Design Idea, Jim Williams, staff scientist
with Linear Technology, explains why PC clocks are invariably wrong, and how engineers
can surmount the extreme measurement challenge involved in solving the
problem.....(design idea added 9/08) |
|
Virtual instrument determines magnetic core's B H loop characteristics - 01/05/06
EDN-Design Ideas: Inexpensive solution combines a laptop, DAQ card, and LabView.....(design
idea added 05/06/07) |
|
Virtual RF generator measures load impedance and power - 03/06/08 EDN-Design
Ideas: Using a virtual instrument, you can measure the power and impedance of
various loads.....(design idea added 03/08) |
|
Vital Signs Monitor Consumes Less than 50 µA - 02/02/98 EDN-Design Ideas:
(design idea added 6/06) |
|
Volt Meter with Video Output - (electronic circuit added 09/05) |
|
Voltage Inverter - (electronic circuit added 4/05) |
|
Voltage Inverter IC Forms High Efficiency Rail Splitter - Maxim Application Note
#218 (app note added 5/08) |
|
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 ….(design added 08/08) |
|
Voltage Monitor Prevents Deep Discharge of Battery - 05/07/98 EDN-Design Ideas:
contains multiple circuits, scroll to find this circuit.....(design idea added 05/02) |
|
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.....(design idea added 11/05) |
|
Voltage Probe - (circuit added 9/04) |
|
Voltage reference improves JFET - 10/26/00 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.....(design idea added 05/03) |
|
Voltage timer monitors line connected AC loads - 08/16/07 EDN-Design Ideas:
A one-wire counter and an optoisolator keep track of the on-time of an ac
load.....(design idea added 09/08) |
|
Voltmeter - ….(electronic schematic added 08/08) |
|
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….(design added 08/08) |
|
Voltmeter Monitors TTL Supplies - National Semiconductor Application Note
(app note added 2/06) |
|
Volume Control (Aaron Cake) - based on DS1669 Digital Pot IC (added 5/02) |
|
VU and PPM Audio Metering - circuits using analog needle meters (added
5/02) |
|
VU Meter - 5 led VU meter, in PDF format, includes circuit board, text in Finnish
(added 5/02) |
|
VU meter - 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.
(added 08/08/08) |
|
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...(added 08/08/08) |
|
VU Meter Amplifier - (electronic schematic / circuit added 4/02) |
|
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) |
|
Waterman S-10-A "Pocketscope" oscilloscope schematic - (circuit added 07/07/07) |
|
Watt-Hour Meter using PIC16C923 and CS5460 - Microchip Application Note Published
16-Oct-00 (app note added 2/06) |
|
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. ….(circuit
design added 11/08) |
|
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) |
|
Whistle Responder - Beeps when hears your whistle A gadget suitable for
key-holders, games etc. (added 9/04) |
|
White LED Life Tester - This simple circuit is designed to plug into a standard AC
electrical outlet. It uses four super bright white light emitting diodes (LED)
in conjunction with a capacitor coupled full wave rectifier circuit. The LEDs are
mounted in a box and are angled slightly to bounce the light off of a nearby wall.
The light should last about 10 years. The circuit draws less than one half of
one watt of power and can therefore run continuously. In spite of the low power,
the LEDs provide sufficient illumination for most night light applications.
Circuit component values for both 120vac and 240vac are shown. ….(designed by David A.
Johnson) |
|
Xmas Lights Tester - (circuit added 9/04) |
|
XTal Tester - ….(circuit design added 08/08) |
|
XTAL-CONTROLLED FM TX (V6) - One solution to the problem would be to use a
low-frequency crystal oscillator and modulate it. Since a crystal can be modulated by
typically only 1KHz or 2KHz, then the multiplication factor would have to be around
72. This would require a 1.3888MHz crystal and several multiplier stages, each
individually tuned....designed by Harry Lythall, SM0VPO (circuit design added
04/05/06) |
|
Zener diode and 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.....(design idea added 2/06) |
|
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) |
|
Zener Diode Tester zen22142 - 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.....(schematic added 8/03) |
|
Zener test circuit serves as DC source - 11/25/04 EDN-Design Ideas: 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.....(design idea added 11/04) |
