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Logic Probe3 Audible TTL/CMOS - A logic tester with an audible
indicator can be handy when troubleshooting or testing a crowded circuit
board. It allows you to keep your eyes on the circuit, rather than on a LED
on the tester..…. [Tony van Roon's circuit] |
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Logic PSU with OverVoltage Protection - 6 volt regulated power
supply for TTL and 74LS series integrated circuits, includes output
Overvoltage fault protection… [Andy Collison, designer] |
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Logic Pulser - Has DIP switch for setting output waveform
characteristics. (schematic / circuit added 05/07) |
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Loop Sensor - Many security systems use a closed loop of wires and
switches arranged so that whenever a door or window is opened, the loop will
be broken and the alarm will sound. An obvious problem is that someone can
tamper.... |
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LOPIC Logic Probe with Pulser - This project is a combination
Logic Probe and Logic Pulser. It is capable of testing all sorts of digital
and microcomputer projects. You will find it extremely handy when
designing a project as the golden rule is to test everything in steps
and stages during the design-and-construction process. If you are not sure
how a Logic Probe or Pulser works.... |
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Low Cost Tamper-Resistant Energy Meter Based on the ADE7761 with Missing Neutral
Function - AN-687 Analog Devices Application Notes....[App Note]
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Low Cost Watt-Hour Energy Meter Based on the AD7755 Chinese Version-5/2000 -
AN-559 Analog Devices Application Notes....[App Note] |
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Low Cost Watt-Hour Energy Meter Based on the ADE7755 - AN-559 Analog Devices
Application Notes....[App Note] |
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Low Cost Watt-Hour Energy Meter Based on the ADE7757 - AN-679 Analog Devices
Application Notes....[App Note] |
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Low Frequency Oscillator - A low frequency test oscillator for testing tone
controls and experimenting….(circuit designed by Andy Collison added 09/09/09)
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Low Noise Amplifier for Phase Noise Measurements - 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.... |
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Low Power LED Voltmeter - This is a low power voltmeter circuit that can be
used with alternative energy systems that run on 12 and 24 volt batteries. The
voltmeter is an expanded scale type that indicates small voltage steps over the 10 to
16 volt range for 12 volt batteries and over the 22 to 32 volt.... [G. Forrest Cook] |
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Low power timer - Low power timer. It can operate with a CR2032 litium
battely. (added 6/06) |
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Low Speed AVR Oscilloscope - A few months ago as I was surfing on the net, I
saw an oscilloscope based on PIC18F2550 microcontroller and a KS0108 controller based
graphical LCD. That was Steven Cholewiak's web site. I had never seen before so
amazing microcontroller, only oscilloscope. That was realy impressive circuit, so I
decided to design something like that but in C language instead of assembly
….(electronic schematic added 11/08) |
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Low Value Capacitance Meter - This circuit was originally designed to
measure the volume of fluid inside a medical syringe. As designed, it
produces a zero to 5 volt output, corresponding to a capacitance change of about 10
picofarads. With a digital voltmeter, at its output, it can resolve a
capacitance change of 0.002 picofarads or 2 femtofarads. (added 12/04) ….
[Designed by David A. Johnson] |
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Low Voltage , High Current Time Delay Circuit - (diagram added 05/07)
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Low Voltage Disconnect Circuit - A simple automatic circuit that will
disconnect a battery before it can be discharged too low and be in danger of cell
damage. Very useful for remote radio sites and to protect any battery used for
emergency backup purposes…. [Circuit Design by Burton Lang] |
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Low-cost BER tester measures errors in low data rate applications - 5-Dec-05
Issue of EDN You don't need an expensive pattern generator to produce a PRBS
(pseudorandom-bit-sequence] signal for making elementary BER (bit-error-rate]
measurements in low-data-rate continuous-transmission systems.... [Design Idea by
Cedric Mélange, Johan Bauwelinck, Jo Pletinckx, and Jan Vandewege, Ghent University,
Ghent, Belgium; Edited by Brad Thompson and Fran Granville] |
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Low-cost current monitor tracks high DC currents - 1-Mar-07 Issue of EDN
Oscillator's output tracks current as it varies inductor's core characteristics....
[Design Idea by Susanne Nell, Breitenfurt, Austria; Edited by Brad Thompson and Fran
Granville] |
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Low-cost relative humidity transmitter uses single logic IC - 8-Nov-01 Issue
of EDN The low-cost percentage-relative-humidity radio transmitter in Figure 1
operates in a cold-storage warehouse for vegetable storage at temperatures of 1 to
5°C. It is generally difficult to collect such data from a low-temperature area with
high humidity and low illumination. The transmitter design is simple It uses a
readily available, capacitor-type percentage-relative-humidity se.... [Design Idea by
Shyam Tiwari, Sensors Technology Ltd, Gwalior, India] |
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Low-cost RF sniffer finds 2.4 GHz sources - 23-Nov-06 Issue of EDN
Locate interference sources in the ISM band.... [Design Idea by Vladimir Dvorkin,
Linear Technology Corp, Milpitas, CA; Edited by Brad Thompson and Fran Granville] |
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Low-power voltage-to-frequency converter makes a wireless probe for testing an
inductive power supply - 26-May-05 Issue of EDN Inductive pickup
measures low-power circuit's supply.... [Design Idea by Francis Rodes, Eliane Garnier,
and Salma Alozade, ENSEIRB Talence, France; Edited by Brad Thompson] |
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LT5528 WCDMA ACPR & AltCPR Measurements - AN99 Linear Technology ACPR
(adjacent channel power ratio) and AltCPR (alternate channel power ratio) are both
measures of spectral regrowth. They are important performance metrics for digital
communication systems that use, for example, WCDMA (wideband code division multiple
access) modulation....(app note added 2/06). |
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Lux Meter - This is a simple Lux Meter that is suitable for beginners.
(added 6/06) |
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