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LED (Light
Emitting Diodes) Circuits Page 8d
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Last Updated on:
Wednesday, November 29, 2017 05:40 AM |
| Circuits
Designed by Dave Johnson, P.E. : |
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Lighthouse LED Flasher
This was originally designed for a model in a HO train set. It simulates the
behavior of the light from a lighthouse. The LED intensity gradually
increases, then flashes with a bright light and finally decreases slowly in
intensity.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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LED3X LED Sensor Electronic Tracker with H-Bridge Drive - The
LED3 using surface technics was just to hard to assemble in a timly manor
as sales were increasing. I needed a circuit that could be built with
mostly through hole components. At the same time, there were other
features and..... [The site is owned by Duane C. Johnson] |
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LED7 Solar Tracker - (electronic circuit added 7/03)
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LED-Based Message Display - ..... |
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LED-Current Limiting Resistor Calculator - The calculators on
this page can be used to find current limiting resistors and currents for
Light Emitting Diodes...[from Rob Paisley's Model Train web site] |
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LEDs Flasher Alternately - Classic astable multivibrator using 2
transistors. Transistor is not critical. Try these: 2N4401, 2N2222,
NTE123A, NTE123AP, NTE159, TUP/TUN and those in your junk box, you may
find that most of them will work.… [Tony van Roon's circuit] |
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LEDs or Lamps Sequencer - Very simple, versatile modular design
No limits to the number of modules used in the ring..... |
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Light a white LED from half a cell - 12-Jun-03 Issue of EDN Whether
you use them as indicators or to provide illumination, LEDs are hard to beat in
efficiency, reliability, and cost. White LEDs are rapidly gaining popularity as
sources of illumination, as in LCD backlights, but with forward voltages typically
ranging from 3 to 5V, operating them from a single cell presents obvious
difficulties..... [Design Idea by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK] |
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Light Emitting Diode - Current Limiting Resistor Calculator - The
calculators on this page can be used to find current limiting resistors and currents
for Light Emitting Diodes. The first calculator determines the resistance for a
desired LED current while the second calculates the current for a given resistance.
[from Rob Paisley's Model Train web site] |
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Light Pollution Meter - LED brightness control circuit and a millimeter to
compare light levels to LED level...... |
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Lighthouse LED Flasher - This was originally designed for a model in a HO
train set. It simulates the behavior of the light from a lighthouse. The
LED intensity gradually increases, then flashes with a bright light and finally
decreases slowly in intensity. …. [Designed by David A. Johnson] |
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