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Heath EUW-20A Servo-Recorder specs & schematic - (added 07/07/07)
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Heath EUW-24 VTVM specs & schematic - (added 07/07/07) |
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Heath EUW-25 DC Oscilloscope specs & schematic - (added 07/07/07)
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Heath EUW-27 Sine-Square Wave Generator specs & schematic - (added 07/07/07)
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Heathkit AV-1 AC voltmeter schematic - (added 07/07/07) |
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Heathkit G-5 Signal generator schematic - (added 07/07/07) |
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Heathkit HD-1 harmonic distortion analyzer schematic - (added 07/07/07)
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Heathkit HD-1250 solid-state dipper schematic - (added 07/07/07)
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Heathkit HM-10A "Tunnel Dipper" schematic - (added 07/07/07) |
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Heathkit IB-2 impedance bridge schematic - (added 07/07/07) |
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Heathkit IM-18 VTVM schematic (similar to most other Heath VTVMs) - (added
07/07/07) |
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Heathkit IP-17 0-400V regulated power supply schematic - (added 07/07/07)
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Heathkit IP-27 LV regulated power supply schematic - (added 07/07/07)
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Heathkit RC-1 Radiation Counter partial manual - (added 07/07/07)
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Hewlett-Packard 200CD AF oscillator schematic (early model with 6SH7/6AU5GT) -
(added 07/07/07) |
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Hewlett-Packard 206A AF oscillator schematic - (added 07/07/07)
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Hewlett-Packard 3200B VHF oscillator operating & service manual - (design
added 08/03) |
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Hewlett-Packard 339A Distortion Analyzer manual - (design added 07/07/07)
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Hewlett-Packard 400 AF VTVM manual w/schematic - (added 07/07/07)
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Hewlett-Packard 410B RF VTVM schematic - (added 07/07/07) |
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Hewlett-Packard 606A RF generator manual w/schematic - (design added
07/07/07) |
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Hewlett-Packard 711A Power Supply manual - (design added 07/07/07)
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High & Low Voltage Cut Off With Time Delay - The power line fluctuations and
cut-offs cause damages to electrical appliances connected to the line. It is more
serious in the case of domestic appliances like fridge and air conditioners. If a
fridge is operated on low voltage, excessive current flows through the motor, which
heats up, and get damaged.….(electronic schematic added 08/08) [Site is under
construction right now] |
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High Impedance Voltmeter - This circuit is designed to provide an
inexpensive way to to create a High Impedance Voltmeter while making use of an
inexpensive analog or digital multimeter. The circuit is specifically designed for
testing phototransistors when they are used in the circuits shown at this site. It has
a very high input impedance that will not "Load Down" the sensor that is being
checked.... [from Rob Paisley's Model Train web site] |
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High Precision Rail-to-Rail Output Operational Amplifier - National
Semiconductor Application Note LMV2001 April 2004....[App Note] |
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High Resistance Voltmeter - .... |
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High-impedance FET probe extends RF spectrum analyzer's usable range -
21-Jul-05 Issue of EDN Op amp and careful design/construction build
high-impedance RF probe.... [Design Idea by Steve Hageman, Windsor, CA; Edited by Brad
Thompson and Fran Granville] |
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High-impedance voltmeter - An ideal voltmeter has infinite input impedance,
meaning that it draws zero current from the circuit under test. This way, there
will be no "impact" on the circuit as the voltage is being measured. The more current
a voltmeter draws from the circuit under test, the more the measured voltage will
"sag" under the loading effect of the meter, like a tire-pressure gauge....
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High-side current monitor operates at High-Voltage - 22-Jul-04 Issue of EDN
The simplest technique for measuring current in an actuator or a motor is to monitor
the ground current with a resistive element between the load and the ground. Because
the device and its associated electronics share a ground potential, you need to
amplify only the ground-current signal. This approach, however, does not detect
device short circuits to ground, which can overload the high-side d.... [Design Idea
by Greg Sutterlin and Brian Whitaker, Maxim Integrated Products, Sunnyvale, CA] |
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High-Side Current Sensing: Considerations & Applications for High-Side Current
Monitoring - Zetec Semiconductors Applications Notes A guide for
using the ZXCT range of products. Contained within the note are application ideas for
extended supply ranges, a circuit for bi-directional current sensing and an
over-current/short circuit protection circuit. Now updated and contained within AN39
(app note added 2/06) |
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High-side Current-sense causes little error - 0316/95 EDN-Design
Ideas....Measuring dc would be simple if you could always reference your measurement
signals to the positive rail. Unfortunately, most current-metering applications
require a ground-referenced output. Typically, the signal that you want to measure
consists of a small differential signal that rides on a large common-mode voltage....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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High-side current-sensing switched-mode regulator provides constant-current LED drive
- 14-Apr-05 Issue of EDN Drive LEDs with constant-current source....
[Design Idea by Bradley Albing, Philips Medical Systems Inc, Cleveland, OH; Edited by
Brad Thompson] |
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High-speed lightwave component analysis - Aligent Application Note 1550-6
(added 4/08) |
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Home-Brew electronic altimeter - A while back, I decided I wanted an
altimeter to record how high my rockets were flying. I didn't want to buy one, since
a) they aren't cheap (at least, not the ones which do everything I want them to do),
and b) buying one is far too easy. I considered the CP Technologies kit, which is
based on the Missile Works RRC2,.... |
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HOTCHEK - The HOTCHEK is a compact expanded scale voltmeter designed to
check the receiver battery pack. Its very small size makes it great as onboard voltage
monitor or it can be used as a "pocket meter," replacing those old fashioned bulky
meters. A 0.3A load can be placed across the batteries with a push of a button
allowing the true state of the pack to be tested .... |
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How to Use the MAXQ2000 as a Voltmeter - Maxim App Note 4194 --
3/24/2008 -- (app note add 5/08) |
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HP48SX IR DECODER - (electronic design added 6/07) |
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HV430 105 Volt RMS Ring Generator - Supertex Semiconductors (app note
added 2/06) |
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Hygrometer and hygrostat - A simple handheld relative humidity meter,
complete with settable control output. [Manfred Mornhinweg] |
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IC and DMM form direct-read-out temperature probe - 1-Sep-06 Issue of EDN
Simple circuit yields linear voltage-versus-temperature output.... [Design Idea by
Alfredo H Saab and Bich Pham, Maxim Integrated Products Inc, Sunnyvale CA; Edited by
Brad Thompson and Fran Granville] |
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IEC Compliant Active-Energy Meter Design using the MCP3905/6 - Microchip
Application Note Published 27-Jul-05....[App Note] |
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IEC Compliant Active-Energy Meter Design using the MCP3905/6Chinese -
Microchip Application Note Published 17-Oct-05....[App Note] |
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Improved current monitor delivers proportional-voltage output - 19-Jan-06
Issue of EDN New, improved circuit delivers an accurate linear-voltage output
proportional to current in primary winding.... [Design Idea by Susanne Nell,
Breitenfurt, Austria; Edited by Brad Thompson and Fran Granville] |
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Improved Kelvin contacts boost current-sensing accuracy by an order of magnitude -
17-Feb-05 Issue of EDN Many power-supply designs rely on accurately sensing the
voltage across a current-sense element. Multiphase regulators use the sense voltage to
force current sharing among phases, and single-phase regulators to control the
current-limit setpoint. As internal complexity and clock speeds increase, processors
impose narrower operating margins for power-supply voltages and currents, which in
turn m.... [Design Idea by Craig Varga, National Semiconductor Corp, Phoenix, AZ] |
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Improved two-tone, third order testing - Application Note MiniCircuits.com
(app note added 04/05/06) |
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In Circuit Transistor Checker - It is able to check transistors, in the
circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can
also check the output power transistors on amplifier circuits….(added 04/05/06)
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In-circuit electrolytic Tester - This project comes in two versions: as an
"add-on" for the 5x7 project (pages 1&2) and as a "stand-alone" project (pages3&4).
Read both sections before deciding on which version you will build….(circuit added
05/06) |
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Increasing Regulator Current - An outboard pass transistor used to increase
the current output of a voltage regulator IC….(added 01/2010) [Andy Collison -
designer] |
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Indicator features expanded scale - 21-Feb-02 Issue of EDN Test
equipment for a production line should be user-friendly (read "idiot-proof"] and
should offer minimal test time. In many cases, the test fixture must give an operator
only one answer pass or fail. Usually, two indicators assume this role
green for pass and red for fail. In most applications, a sensor transforms the tested
parameter to a voltage; the test fixture must measure this v.... [Design Idea by Abel
Raynus, Armatron International, Melrose, MA] |
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Inductance meter - Determination of the resonance frequency of a parallel LC
network is one of the most important measuring problems in the ham shack. Not unjustly
the commonly used dip meter is nicknamed “sounding-rod of the radio amateur”. A
more elegant method for measuring the resonance frequency is …(circuit added 04/05/06)
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| Inductance meter - .... |
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Inductance meter adapter - The following circuit enables me to measure
inductance of the inductor labeled LX which is the inductance to be measured. The o/p
of the circuit is a TTL square wave whose frequency relates….By Tosin Osanyintuyi (TAFRICA)
(circuit added 09/08) |
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Inductance meter for RF Inductors - needed a way to measure
hand-wound RF inductors in my second lab, and since I would only be doing this
occasionally, I didn't need anything fancy, and since once a friend finishes his
AT90S1200-based design, I plan to make one myself, I figured I'd use this for less
than a year, so I didn't t,....(schematic / circuit added 6/07) |
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Inductive meter adapter - ….(design added 03/08) |
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Inductor Self-Resonance Tester - If you want to know what the self-resonance
frequency is of an inductor, this circuit will help. It adds only a few picofarads of
parallel capacitance to the inductor under test. With the aid of an oscilloscope and a
signal generator this circuit will allow you to measure resonant frequencies from
kilohertz to over 10 megahertz. …. [Designed by David A. Johnson] |
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Infra Red Remote Control Tester) - ….(design added 03/08) |
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Infrared Remote Control Tester - This circuit is the result of my research.
I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET opamp, CA3140 is
used in the differential mode to amplify the pulses of current from the photodiode.
LED1 is an ordinary coloured led which will light when IR radiation is being received.
The output of the opamp, pin 6 may be connected to a multimeter set to read DC volts.
Infra red remote control strengths.... [Andy Collison designer] |
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Instrumentation amplifier extends DSO - 5-Jan-06 Issue of EDN Elusive
current waveforms required scope documentation.... [Design Idea by Bob Perrin,
Sacramento, CA; Edited by Brad Thompson and Fran Granville] |
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Integrator enables simple ohmmeter with gigohm range - 24-May-07 Issue of
EDN With the aid of an external counter and control circuitry, this system can
measure resistances in the tens of gigohms.... [Design Idea by Stefano Salvatori and
Gennaro Conte, Università degli Studi di Roma Tre, Rome, Italy] |
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Integrator Forms Picoammeter - 07/17/97 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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Introduction to Time, Frequency & Modal Domains 5988-6765EN - Aligent
Application Note 1405-1 (added 4/08) |
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Invisible Broken Wire Detector - Circuit / schematic (added 02/05)
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IR Digital Thermostat for FAN - ….(electronic schematic added 08/08) [Site
is under construction right now] |
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IR Remote Control Tester - Gadget Freak Case 147: Couch potatoes
should be particularly interested in Bill Bowden's remote control IR receiver, which
allows users to control the power of virtually any electrical appliance (including
those not equipped for remote) using their standard remote control. It's based on an
IR receiver circuit, |
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IR Remote Control Tester - A simple IR receiver to facilitate in testing of
Infra Red Remote Control handsets…. [Circuit design by Andy Collison] |
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IR Remote Volume Controller - …. |
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IR Remote-Control Checker - Suitable for any Infra-red emitting device.
3V battery supply .... |
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IRDCiP1202-A 300kHz Dual 15A 5.5VIN to 13.2VIN Dual Output Synchronous Buck Converter
using iP1202 - This board allows engineers to easily evaluate the iP1202 in
an independent and parallel configuration that is capable of providing up to 15A per
phase with double-sided heat sinking. (added 3/05) |
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IRDCiP2001-A 500kHz 40A 2-phase Synchronous Buck Converter using iP2001 -
This board enables engineers to easily evaluate the iP2001 in a 2-phase configuration
that is capable of providing up to 40A in a lab environment without airflow.
(added 3/05) |
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IrOn-Off - ….... |
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Isolated Ac Current Monitor - This circuit uses a small AC current
transformer from Magnetek to produce an isolated voltage proportional to the AC
current in the primary winding. The transformer contains a single turn primary
with a low 0.001 ohm resistance. It can easily handle 30 amps of AC current and
provides at least 500vac of isolation. With the components shown, the output AC
voltage is scaled so 1 amp of current produces 100mv of AC voltage.... [Designed by
David A. Johnson] |
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Isolated circuit monitors ac line - 5-Jul-07 Issue of EDN A simple
circuit develops a square wave whose pulse width is proportional to the mains-voltage
level.... [Design Idea by David Williams, Millington, MI] |
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Isolated clock source acts as test generator - 19-Mar-09 Issue of EDN
A cost-effective approach to implementing an isolated clock source uses a high-speed
optocoupler with low input-to-output capacitance.... [Design Idea by Daniele Danieli,
Eurocom-Pro, Venice, Italy] |
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Isolated Probe - This probe allows connecting to such 'floating' circuits to
a normal scope input. As seen in the circuit, it is based on using an
optocoupler. The one shown in the diagram is a dual unit, but I had a pile of
them here, so thats what I used. …....) [Luhan Monat - Mesa Arizona] |
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Jitter Measurement Techniques - Pericom Semiconductor Application Brief #
036 (app note added 2/05) |
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Jitter Measurements using Eye Patterns Test Report #1 - National
Semiconductor Application Note (app note added 2/06) |
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Keys finder - The ear and mouth of the circuit is a piezoelectric buzzer.
Fizzling in a frequency of 3....4 KHz produced sound waves that piezoelectric buzzer
converts them to an oscillation. This oscillation passes thought C1 and thought
inverters N1....N3.The inverters along with R1 and R2, compose an amplifier with gain
400 ! .The C8 and C9 stabilize and reduce the signal's level.….... |
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