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LED or Incadescent 12 Volt Lamp Fader - (electronic circuit added 6/07)
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LED or Lamp Flasher - Minimum parts counting. Designed for3V battery operation
(added 9/04) |
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LED or Lamp Pulser - Astonishing effect4.5 Volt supply (added 9/04) |
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LED Oscilloscope - George Katz of Balgowlah Boys high in Sydney presented a
solid state oscilloscope. He says "probably the best advantage is its very small
size and the fact that it can run off the power supply of the circuit being
tested. Although it has a low frequency range, it can still be used for most
circuits. Its poor resolution will still allow for most waveforms to be
visualized." ….(electronic schematic added 11/08) |
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LED Oscilloscope - Uses a matrix of 100 LED as a display (circuit added 11/06)
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LED Photo Sensor Circuit - Here's a circuit that takes advantage of the
photo-voltaic voltage of an ordinary LED. The LED voltage is buffered by a
junction FET transistor and then applied to the inverting input of an op-amp with
a gain of about 20. This produces a change of about 5 volts at the output from
darkness to bright light. The 100K potentiometer can be set so that the output is
around 7 volts in darkness and falls to about 2 volts in bright light... (added
4/05) |
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LED Photodetector - Using the light-emitting diode as the photodetector
(circuit added 11/06) |
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LED Pilot Light AC or DC - LED current is constant between 6 and 8 mA at5
to30Vdc (added 4/02) |
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LED power meter - Used for testing RF transmitters (electronic circuit
added 05/07) |
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LED Relay Timer - This circuit provides a visual 9 second delay using a 7
segment digital readout LED. When the switch is closed, the CD4010 up/down counter
is preset to 9 and the 555 timer is disabLED with the output held high. When the
switch is opened,....(circuit / schematic design added 6/06) |
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LED RF Signal Meter - (circuit added 6/07) |
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LED senses and displays ambient-light intensity - 11/9/2006
EDN Design Ideas / (added 05/07) LED doubles as
photosensor and visual indicator of ambient-light intensity. |
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LED senses and displays ambient-light intensity - (Video Design Ideas- EDN,
9/5/2007 Dhananjay V Gadre of India's Netaji Subhas Institute of Technology
explains how an LED can double as a photosensor and a visual indicator of
ambient-light intensity. (electronic design idea added 9/2008) |
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LED Sequencer - The model 4017 integrated circuit is a CMOS counter with ten
output terminals. One of these ten terminals will be in a "high" state at any
given time, with all others being "low," giving a "one-of-ten" output sequence. If
low-to-high voltage pulses are applied to the "clock" (Clk) terminal of the 4017,
it will increment its count, forcing the next output into a "high" state...
(circuit added 6/07) |
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LED shine - If you wish to have some really nice looking LED's shining out of
your equipment panel, you may try the following trick: pass repeatedly a fine
sandpaper on the surface of any transparent and clear LED until the same …
(added 9/07) |
