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LASER/LED light output intensity meter: (schematic / circuit added 05/07) |
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Latching Continuity Tester : A continuity tester is a must on every service bench for testing cables, pcboards, switches, motors, plugs, jacks,
relays, and many other kinds of components. But there are times when a simple continuity test (or your multi-meter) doesn't tell the whole story. For example, vibration-induced problems in
automobile wiring can be extremely difficult to .... (added 2/06) |
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LB-25: Linear
Brief 25 True RMS Detector: National Semiconductor Application Note (app note added 2/06) |
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LB-48: Linear
Brief 48 Simple Voltmeter Monitors TTL Supplies: National Semiconductor Application Note (app note added 2/06) |
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LCD
Frequency Counter (PIC16F84): (schematic added 8/03) |
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LED Audio VU Meter: logarithmic scale with3 dB steps, based in LM3915 IC (added 5/02) Fair Warning: this site has pop-up ads |
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LED Battery Condition Indicator: (circuit / schematic added 6/05) |
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LED Decibel Meter : (electronic circuit added 10/05) |
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LED Oscilloscope: Uses a matrix of 100 LED as a display (circuit added 8/06)
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LED power meter for testing RF transmitters: (electronic circuit added 05/07) |
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LEE
Test Fixture Instructions AN-60-021: Application Note MiniCircuits.com (app note added 6/06) |
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Light Pollution Meter : LED brightness control circuit and a millimeter to compare light levels to LED level. (added 5/02) |
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Light Sensor - 741 Based : CdS photocell used for light/dark controlled relay (added 05/07) |
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Light Sensor Adapter for Oscilloscope: (electronic schematic / circuit added 4/02) |
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Lightening Detector: A VLF receiver tuned to 300 kHz designed to detect the crackle of approaching lightning. A bright lamp flashes in synchrony
with the lightning bolts indicating the proximity and intensity of the storm. It has a superior RF section with a single resonance near 300kHz and plenty of sensitivity. The antenna is a
telescopic antenna that extends to two or three feet.... (added 5/05) |
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Lightning Activated Camera Shutter Trigger: This circuit is used to trigger a camera's electronic shutter circuit when a flash of lightning is present. This
circuit would also work for photographing fireworks displays or other events involving flashes of light. (added 10/05) |
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Lightning Detectors: A VLF receiver tuned to 300 kHz designed to detect the crackle of
approaching lightning. A bright lamp flashes in synchrony with the lightning bolts indicating the proximity and intensity of the storm. (added 10/05) |
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Lightning Storm Detector : Reverse engineered schematic diagram of a mass produced
lightning detector. The RF signal from lightning is quite strong and broad in spectrum so a tuned circuit is not required at the antenna input stage. Too much sensitivity will cause false
alarms in a simple receiver such as this one. The circuit uses clever pulse timing and integration techniques to discriminate between real lightning and other RF interference... . (added 2/05) |
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Lightwave Component Analysis: Aligent Application Note (added 2/06) |
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Line
Output/Flyback Transformer tester: (schematic added 8/03) |
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Line powered 60Hz clock generator: (diagram added 05/07) |
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Live Power Line
Detector: Detects the presence of a live mains conductor. Has minimum parts counting. (added 08/05)
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LM2675-5.0EVAL 1A Step-Down High-Efficiency SIMPLE Switcher Evaluation Board: The LM2675-5.0EVAL evaluation board is a fully-assembled and tested surface-mount
regulator that provides a 5V±1.5% output at up to 1A, from an input of 8V to 40V. The overall efficiency is typically as high as 90%. The operating temperature range is 0°C to +85°C.
(app note added 3/05) |
