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PC 's IRQ7 & INT1Ch measure currents charges - 10/12/00 EDN-Design
Ideas....Figure 1 shows that you can use just two interrupts (IRQ7 and INT1Ch] of
a PC and a few inexpensive components to make simultaneous measurements of two
electrical quantities. Two examples are low currents and their associated charges,
parameters important in ion implanters….PDF contains multiple circuits - scroll to
find this circuit....[K Suresh, IGCAR, Tamil Nadu, India] EDN is migrating links.
This link is not verified. Google the "title" + EDN for new link.
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PCB VSWR Bridge - Electroinic circuit schematic…. [from Harry Lythall's
website] |
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PC's serial Port controls programmable sine wave generator - 09/01/06
EDN-Design Ideas....Audio-frequency signal source uses few components.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Peak Reading Audio Level Meter - indicates peak audio response on an
analogue meter, similar to a tape recorder recording level meter (added 6/06)
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Peak-reading meters - (circuit / schematic design added 6/06)
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Perform PSRR testing with analyzers having no DC bias ports - 19-Jul-07
Issue of EDN A simple test setup sums the output of an analyzer and a dc
bias to test the RSRR of a DUT.... [Design Idea by David Karpaty, Analog Devices,
Wilmington, MA] |
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Performance Verification of Low Noise Low Dropout Regulators - AN83
Linear Technology In an increasing trend, telecommunications, networking, audio
and instrumentation require low noise power supplies. In particular, there is
interest in low noise, low dropout linear regulators (LDO). Establishing and
specifying LDO dropout performance is relatively easy to do. Verifying that a
regulator meets dropout specification is.... |
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pH meter with calibration - ….(Circuit design added 06/09) |
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Phantom Power Battery Test Circuit - LED will light when battery is
over42 volts (added 5/02) |
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Phase Meter Operates to 10 MHz - 07/04/96 EDN-Design Ideas....You need
phase measurements to set up and verify electronic devices in amplifiers and in
audio, control, ultrasound, and echo systems. Phase measurements can be
problematic, because not many simple, inexpensive phase meters are available.
Moreover, using an oscilloscope is time-consuming and imprecise. The phase meter
described.... [Design Idea by Ronald Mancini, Harris Semiconductor, Melbourne, FL] |
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Philips GM 3150 oscilloscope pictures, brochure, schematic - (circuit
added 04/05/06) |
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Philips GM 3152 oscilloscope pictures, brochure, schematic - (circuit
added 04/05/06) |
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Philips GM 5654 oscilloscope manual w/schematic (nl) - (circuit added
04/05/06) |
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Philips GM 5655/01 oscilloscope manual w/schematic (nl) - (circuit added
04/05/06) |
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Philips GM 6012 AF Millivoltmeter manual w/schematic - (circuit added
04/05/06) |
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Philips GM 655/03 oscilloscope manual w/schematic (nl) - (circuit added
04/05/06) |
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Philips GM 7633/01 "Cartomatic" III tube Tester schematic - (added
07/07/07) |
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Philips PW 4029 regulated power supply schematic - (circuit added
04/05/06) |
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Phone Busy Indicator - Simple busy indicator, does not meet regulations
of many countries because this circuit draws excessive continuous current from the
ph1-line even when not active and this can cause problems with Telephone system….
[Aaron Cake's circuit] |
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Phone-line-voltage monitor meets FCC specs - 19-Aug-04 Issue of EDN
When you design equipment that interfaces to a phone line, it is often desirable
to be able to monitor the dc voltage on the line. This ability can be
useful, for example, to determine whether a line is in use before attempting to go
off-hook and possibly interrupting somebody's phone call. FCC regulations place
strict limits on the amount of leakage current an on-hook device can draw from a
ph.... [Design Idea by Brad Peeters, Theta Engineering, Costa Mesa, CA] |
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Photoresistor provides negative feedback to an op amp, producing a linear response
- 05/27/10 EDN Design Ideas....AGC (automatic-gain-control] amplifiers use
the nonlinear characteristics of control devices. The magnitude of the real
component in some of their differential parameters changes depending on variations
in their dc operating points. A typical example is the VA characteristic of a
silicon PN junction, which results in the differential conductance directly
proportional to the passing dc current (Reference 1]. In this form of control, the
main problem is the control element's nonlinear transfer characteristic, which
causes.... [Design Idea by Julius Foit and Jan Novak, Czech Technical University,
Prague, Czech Republic] |
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PIC Frequency Counter - Programmable frequency meter with PIC16F84 and
UPB1505 prescaler (circuit added 8/06) |
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PIC Logic Probe with Pulser - (electronic schematic / circuit added
4/02) |
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PIC RJ-45 Cable Tester - This RJ-45 cable tester automatically checks
cable continuity and tests the connection configuration. Each of the eight
connections is checked independently and short-circuits are detected. The
circuit can be built using either a PIC16C62B or a PIC16F72.….must register on
this site.... [Published in Elecktor July/August 2010] |
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PIC14C000 Calibration Parameter Theory & Implementation - Microchip
Application Note Published 26-Aug-97 (app note added 2/06) |
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PIC16F84A 3.5GHz LCD Frequency Counter - This Auto Ranging PIC16F84A
Frequency counter counts up to 35-40Mhz and has two separate input BNC connectors.
A pre-scale chip from Nec/CEL may be added with Divide by 256 counters to achieve
3.5GHZ frequency measurements. ….(electronic schematic added 11/08) |
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PIC16F877 APRS Weather Station - Weather Station is PIC16F877A based and
has a 4x20 LCD, a data logger output and accepts 1Wire wind instrument. It has a
built-in APRS TNC. Connect it to your portable rig thru a DIN5 connector and you
have a true portable weather station. ….(electronic schematic added 11/08)
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Picoammeter circuit with 4 ranges - …. [Site is under construction
right now] |
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Picoampere Leakage Tester - Here is a simple two-terminal picoampere
leakage tester for testing diodes, JFETs and other semiconductors. The tester
applies a variable voltage (0 to -4 volts) to one terminal of the component and
measures the ….(electronic design added 6/07) |
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Pink Noise Generator for Audio Testing (Aaron Cake) - For loudspeaker
and room acoustics testing ((electronic Circuit diagram added 03/03/03)
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Polarity Detector (Aaron Cake) - This tester can be used to check the
polarity of any power source, and is therefore very useful when installing
automotive equipment, alarm systems or anything else you can think of. Because
this circuit is so simple and cheap, even frying one with an over voltage is not a
big deal....(added 6/05) |
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Polonium Pen - Recent events point to the need for a simple device for
testing cocktails and beers for excessive quantities of polonium. The Polonium Pen
is a pocket-sized ion chamber with LED readout that is perfect for the job. Simply
hold the Polonium Pen over your drink and, if the LED lights up, order something
else.... |
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Power- and VSWR-meters - Some cheaper "SWR" meters. The Norwegian
Picomatch II to the left is quite good instrument for 144MHz, believe it is
specified quite strict, but some day the instrument people don't like any old
instruments.... [Jan-Martin Nøding's site] |
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Power Chopper Tester - (Circuit added 05/07) |
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Power Loss Indicator - Dave Campbell designed this clever circuit.
It uses two neon lamps to indicate if power to a 120vac appliance had been
interrupted. …. [Designed by David A. Johnson] |
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Powerline Voltmeter - Here’s a rather special voltmeter that will let
you measure the AC grid voltage and also see very accurately how it fluctuates
around its nominal value. The voltmeter has a measuring range of around 50 V that
you can centre around 220 or 240 V to suit your needs. ….must register on this
site.... [Published in Elecktor July/August 2010] |
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Power-up Trouble Shooting - Microchip Application Note Published
26-Aug-97 (app note added 2/06) |
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PRBS generator runs at 1.5 Gbps - 29-Mar-07 Issue of EDN FPGA and
serializer generate fast sequences to test communications links.... [Design Idea
by Lukasz Sliwczynski, AGH University of Science and Technology, Institute of
Electronics, Krakow, Poland; Edited by Charles H Small and Brad Thompson] |
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Precision Ac Peak Detector - This unique circuit uses a very inexpensive
voltage comparator to form a peak detector. The DC voltage produced tracks the
positive peak of the input signal. It works from about ten millivolts to
about 10 volts peak to peak. The maximum frequency is about 150KHz. ….
[Designed by David A. Johnson] |
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Precision Audio MilliVoltmeter - Measures10mV to50Volt RMS in eight
ranges Simply connect to your Avo-meter set @50µA range.... |
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Precision capacitive-sensor interface suits miniature instruments 07/24/08
EDN Design Ideas....In some applications of capacitive sensors, the
instrument’s front end must be small enough to fit into a narrow space.
Figure 1 shows a precision capacitive-sensor interface for such use. The
square-wave….PDF has several circuits, scroll to find this design…. [Design Idea
by Jiaqi Shen and Xiaoshu Cai, University of Shanghai for Science and Technology,
Shanghai, China] |
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Precision Digital Altimeter - The current concept incorporates a
wireless transmitter and receiver and is thought to be used for remote controlled
airplanes or appliances with two separate parts. In other words, we have one
dedicated transmitter (acquisition, filtering) and one dedicated receiver part
(user-interface, look-up table, calibration, storage), capable of being
connected....(added 4/05) |
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Precision Fullwave Rectifier - I have used this handy circuit many
times. It accurately converts an AC signal into pulsing DC, which can be
filtered to provide an average of the input voltage. It works from
millivolts to volts. The circuit shown requires a stable +5v reference if a
single power supply is used. …. [Designed by David A. Johnson] |
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Precision tilt/fall detector consumes less than 1.5 mW - 3-Dec-09 Issue
of EDN Detect X-axis position and indicate it with an LED.... [Design Idea
by Marián Stofka, Slovak University of Technology, Bratislava, Slovakia] |
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Precision Wideband Current Probe for LCD Backlight Measurement - DN101
Design Notes (Linear Technology) (app note added 1/06) |
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Procedure for DDR Clock Skew & Jitter Measurements - Pericom
Semiconductor Application Note # 028 (app note added 2/05) |
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Procedure Tests Transducer - 03/01/96 EDN-Design Ideas....Testing
electromechanical transducers can be as simple as measuring a dc voltage. The
circuit in
Figure 1 and an accompanying test method enable you to measure the damping
coefficient ([beta]) of speakers, microphones, seismic geophones, and other
transducers that exploit electromagnetic phenomena. You can also tailor this
method for testing electrostatic devices, such as capacitive micromachined
sensors. In general, you can measure the damping in any second-order system or
signal, which conforms to the following basic equation for the free transient
process...[Design Idea by Alexander Belousov, SMP Inc Long Island City, NY] |
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Pulse generator aids IC testing 09/01/09 Test & Measurement World: As
ICs increase in complexity and decrease in size, their pin counts drop or, at
best, remain constant. The result: a need for pin-saving measures like serial
programming. In the past, multiple pins might have been available for programming
an IC’s current or voltage limit, but today’s ICs often encode that limit as a set
number of pulses on a serial line. -- [Kevin Frick, Maxim Integrated Products,
Sunnyvale, CA] |
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Pulse Generator Verifies Test Setups - 05/26/94 EDN-Design
Ideas....Verifying the rise-time limit of wideband test-equipment setups is a
difficult task. In particular, you must often know the "end-to-end" rise time of
an oscilloscope/probe combination to ensure measurement integrity. Fig1s circuit
provides an 800-psec pulse.... EDN is migrating links. This link is not verified.
Google the "title" + EDN for new link. |
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Pulse Reading Logic Probe solorb - (electronic diagram added 6/03)
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Pulsed LED Test Circuit - This circuit is designed to test visible and
infrared LEDs in pulsed mode operations. It can drive the LED with peak currents
in excess of 10 amps. A light detector nearby can monitor the response time and
intensity of the LED under test. …. [Designed by David A. Johnson] |
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Pulse-Generator Signal-Tracer - Dual-purpose test-instrument Very simple
circuitry, 1.5V Battery-operated.... |
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Pump Motor Monitor - This circuit can turn on a light or sound a beeper,
whenever an AC line powered pump motor turns on. It is designed to detect
the motor current using a small inductor placed on the outside of the motor’s
power cable. No direct wire contact is needed. (added 12/04) ….
[Designed by David A. Johnson] |
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