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Dark activated switch - started this project with the idea to
build a simple single-ended tube amplifier. I didn't have any experience
with the construction of tube amps so I was looking for a beginner's
project.…(electroninc design added 04/05/06) |
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Dark Activated Switch - This circuit will activate a relay when
light falls to a preset level. Light level can be adjusted with VR1 and the
relay contacts may be used to operate an external light or buzzer.… [Andy
Collison] |
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Dark Detector - When the level of light on the photo-cell
decreases, the 555 is activated. Photo-cells (Photo-resistors) have a wide
range of specifications. Some cells go down to 100R in full sunlight while
others only go down to 1k. Some have a HIGH resistance of between....
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Dark Sensitive Switch - Dark Sensitive Switch is a simple project
which operates a relay when the light falling on the LDR goes below a set
point.…. |
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Dark/Light Activated Relay - The potmeter adjust the trigger 'on'
level. The diode in the diagram shows to be 1N914. This is ok if you
have a light-duty relay, also the 1N914 is a signal diode so actually does
not qualify.... [Tony van Roon's circuit] |
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Dark-activated 230V Lamp - Compact circuitry using small-size parts only.
Can be wired in parallel to existing switches. (added 3/05) |
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Dark-activated LED or Lamp Flasher - This circuit adopts the rather unusual
Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about
1Hz and is set by C1 value…..(electronic design added 6/07) |
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Dark-activated switch needs only three components - 23-Jul-09 Issue of EDN
Build a dark-activated switch with only a triac, a photocell, and a resistor....
[Design Idea by Abel Raynus, Armitron International, Malden, MA] |
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Dark-Detecting LED Circuit - Here's a simple problem: "How do you make an
LED turn on when it gets dark?" You might call it the "nightlight problem," but the
same sort of question comes up in a lot of familiar situations-- emergency lights,
street lights, silly computer keyboard backlights, and the list goes on. Solutions?
Lots. The time-honored tradition is to use a circuit with a CdS photoresistor,
sometimes called a photocell or LDR, for "light-dependent resistor.".….(design added
11/08) |
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Darkness monitor - Schematic only, no circuit description |
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Day & Night Infrared Detection - The following is a method to allow day and
night detection using Infrared/Visible light sensitive phototransistors and a simple
LM339 voltage comparator circuit. [from Rob Paisley's Model Train web site] |
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Day/ Night/ 24 Hour Select Sensor - (circuit added 04/05/06) |
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Demodulator Makes Low Cost Optical Tracker - 06/18/98 EDN-Design Ideas....A
project required building a synchronous-demodulator circuit to track a line drawn on
paper. The beauty of the synchronous-modulator/demodulator approach is its inherent
noise rejection. The method rejects nearly all out-of-band noise, whether from
internal drift....File has several circuits, scroll to find this one.... [Design Idea
by Steven Sarns, Kesta Technology Inc, Wheat Ridge, CO] |
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Detection for Day & Night - The following is a method to allow day and night
detection using Infrared/Visible light sensitive phototransistors and a simple LM339
voltage comparator circuit. [from Rob Paisley's Model Train web site] |
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Digitally control room light intensity - 11-Nov-04 Issue of EDN Many
people favor different light and temperature settings for different rooms depending
upon their mood or whether they are working or relaxing. The circuit in Figure 1
controls the intensity of the artificial light in a room and monitors the temperature
of two zones. The two main circuit blocks are the PIC16C67 master controller and the
ADT7516 temperature-sensor interface, which includes a.... [Design Idea by Donal
McNamara and Kieran Kelly, Analog Devices, Limerick, Ireland] |
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FET Input High Speed Light Detector - This circuit is yet another design
that converts current from a PIN photo diode to a voltage. It has a bandwidth that
extends beyond 50MHz. …. [Designed by David A. Johnson] |
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High-speed lightwave component analysis - Aligent Application Note 1550-6
(added 4/08) |
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Honeybee Counter - I designed a circuit similar to this one a long time ago
to help a beekeeper count the number of bees going into or out of a hive. The low
power circuit uses a slotted opto-sensor to detect the passing bees. The circuit
advances an electronic counting module whenever a honeybee passes through the sensor.
The device only counts the number of bees going through the sensor. A different
circuit would be needed to count the number of bees only going out or only coming into
the hive.... [Designed by David A. Johnson] |
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Image-capture system uses USB and LabView 24-Jun-10 Issue of EDN Capturing
and processing graphical images requires manipulating data into a form that you can
use. This Design Idea describes an imaging system using a USB (Universal Serial
Bus ) image-capturing system that uses OmniVision’s 640×480-pixel, 8-bit-color OV7660
image sensor. The CY7C68013A-128AXC from Cypress Semiconductor provides a USB
interface between a PC and the image sensor (Figure 1). The control software is
written in LabView from National Instruments.... [Design Idea by Chien-Hung Chen and
Po-Jui Chen, National Applied Research Laboratories, Hsinchu, Taiwan] |
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Infrared Detection - The following is a method to allow day and night
detection using Infrared/Visible light sensitive phototransistors and a simple LM339
voltage comparator circuit. [from Rob Paisley's Model Train web site] |
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Infrared Light Photo-Detector Circuit - In this circuit the light falling on the
phototransistor will be from an Infrared Light Emitting Diode (IrLED) but otherwise it
is the same as the phototransistor circuit shown above. When the light falling
on the phototransistor (Q1) is blocked, its conductance will decrease and the voltage
across Q1 will rise....scroll to find this circuit.... [from Rob Paisley's Model Train
web site] |
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Inspect solar cells without a microscope - 26-Nov-09 Issue of EDN Use
a short-wave infrared camera to capture the image of an entire wafer.... [Design Idea
by Chun-Fu Lin and Tai-Shan Liao, National Applied Research Laboratories, Hsinchu,
Taiwan] |
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Introduction To Photovoltaic By-Pass Diodes - MicroNote 304 from Microsem....[App
Note] |
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IR Proximity Detector - The circuits on this page are for an Infrared
Proximity Detector using the Vishay Electronics TSOP4830 "IR Receiver Modules for
Remote Control Systems"….Scroll down to view all the circuits…. [from Rob Paisley's
Model Train web site] |
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