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Electric Field Disturbance Monitor-1 - This schematic is the power supply and
front-end sections of the field monitor that is discussed in more detail at
Electric Field Disturbance Monitor. The system can detect human and animal motion
by the electric fields they disturb. ….(designed by David A. Johnson) |
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Electric Field Disturbance Monitor-2 - This schematic is the motion
discriminator alarm and battery monitor sections of the field monitor that is
discussed in more detail a Electric Field Disturbance Monitor. (link is off-site)
….(designed by David A. Johnson) |
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Electronic Card Lock System - (electronic Circuit / Schematic added 10/04) |
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Electronic Combination Lock (Randy Linscott) - This circuit is very basic to
build. To open a the lock which is connected to the K1 Load you must press each
momentary switch in the correct sequence. The sequence used in this circuit is
S1,S2,S3,S4. If any of the other switches are pressed….(added 08/08/08) |
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Electronic door codelock PIC16F84 - (schematic / circuit added 10/02) |
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Electronic Door Codelock with PIC16F84 - (circuit / schematic design added
6/06) |
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Electronic Keypad - (electronic design added 9/02) |
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Electronic Lock - This is my electronic combination lock to use with an
outdoor gate. The functionality is implemented in software. It turns on a relay
(usually to open a door) for a few seconds…. Uses a PIC16F84A (circuit added
08/07/06) |
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Electronic Lock (Bill Bowden) - The digital lock shown below uses 4 common
logic ICs to allow controlling a relay by entering a 4 digit number on a keypad.
The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are
gated...(added 05/07) |
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Electronic Locker - This circuit is an Electronic Locker. It is controlled by
a switches combination (by a code). There is a switch matrix on the door of the
locker. This one is a unit of switches connected into 4 arranged of 4 columns for
a total of eight terminals.....(circuit design added 09/08) |
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Electronic Police Siren - The sound produced imitates the rise and fall of an
American police siren. When first switched on the 10u capacitors is discharged and
both transistors...(electronic design added 6/07) |
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Electronic Safety Lock Based on Attiny26 - This safety-lock can be work with
up to 8 different telecards (empty or not) as access keys. Each telecard can be
registered or unregistered from the system, by press the corresponding
button.…(electronic circuit added 4/05) |
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Emergency Light - A simple circuit that activates a light when the power is
out. A version with a lightbulb and another with white LED light included.
(6/25/2006) |
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Emergency Light & Alarm - This circuit is permanently plugged into a mains
socket and NI-CD batteries are trickle-charged. When a power outage occurs, the
lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder
can be chosen...(electronic design added 6/07) |
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Emergency Lighting Systems & Battery Powered Fluorescent Lighting - Zetec
Semiconductors Applications Notes An overview of the principles behind
typical emergency lighting systems, fluorescent tube behaviour, and the
requirements of the transistors for efficient voltage inversion. The note also
includes two "Royer" based designs for low voltage systems. (app note
added 2/06) |
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Emergency Power - This unit was constructed in a plastic 4-outlet juction box
($5 from Home Depot). The front panel is cut from 60-thou Lexan, and a
scrapped Pep-Boys battery charger provided the transformer. The PIC16F870
keeps track of battery voltage as well as both charging and discharging currents.
….(design added 08/08) |
| Emergency Siren Simulator - This siren circuit
simulates police, fire or other emergency sirens that produce an up and down wail.
(added 10/05) |
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Enhanced Alarm Keypad - (electronic design added 9/02) |
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Factory Siren - This circuit produces a sound similar to a factory siren.
It makes use of a 555 timer IC used as an astable multivibrator of a center
frequency of about 300Hz. The frequency is controlled by the pin 5 of the IC. When
the supply is switched ON, the capacitor charges slowly and this alters the
voltage at pin 5 of the IC hence the frequency gradually increases. After ....
(added 10/05) |
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Fire Alarm - This circuit warns the user against fire accidents. It relies on
the smoke that is produced in the event of a fire. When this smoke passes between
a bulb and an LDR, the amount of light falling on the LDR decreases. This causes
the resistance of LDR to increase and the voltage at the base of the transistor is
pulled high due to which the supply to the COB (chip-on-board).... (added
8/06) |
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Frame Grabber - Intersil Application Block Diagram (app note added 6/06) |
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Gate Alarm Circuit zen22142 - (circuit design added 8/03) |
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Home Security Project - (circuit design added 8/03) |
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iButton electronic lock Circuit - This electronic lock can be used with any
type of iButtons you may already have, since the only thing needed is the internal
serial number, that's different for every iButton…..(circuit diagram added 09/08) |
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Infrared Detector (Tomi Engdahl) - This circuit is a simple IR detector for
testing IR remote controllers. The circuit is based on one phototransistor which
receives the IR beam. The NPN transistor works as an amplifier which feeds current
to the led. When this circuit detects IR or light, the LED is on. So you need to
shield the phototransistor from ambient light if you don't want to do your tests
in the dark. The best way ....(circuit / schematic added 2/03) |
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Infrared gate 2 (Peter Jakab) - This is an infrared gate with two sensors
planned to use in the wall in the way behind a door. It can be applied in a toilet
to keep track of that someone is inside exceeding a certain amount of time. After
that time elapsed, the circuit triggers the digital output wich can turn on a
ventillator. The time period ....(electronic circuit added 7/03) |
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Intruder Radio Alert System - (electronic Circuit / Schematic added 10/04) |
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IR 'slotted Switch' Sensor - ASCII format (added 10/04) |
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Keypad Controlled Switch No. 2 - This is a simplified version of the 4-Digit
Keypad Controlled Switch. I have modified the design to reduce the complexity of
the circuit, and the number of components required. As a result, the code is
somewhat less secure. However, there should be lots of situations where it will
still be adequate. (circuit design added 08/08/08) |
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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 4/02) |
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Lightning Detectors - The following circuit is an improved version of my
original Lightning Detector designed to run on a 5 volt supply...(circuit added
05/05/05) |
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Low cost/ Automatic Emergency Light - ….(electronic schematic added 08/08) |
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Low Power RFID Transponder - For some time railroad companies have been
wrestling with the problem of tracking rail cars. This has traditionally required
manual log entry of identification numbers displayed on the cars as they pass
through the switching yard….(diagram added 7/03) |
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Luggage Security System - (electronic Circuit / Schematic added 10/04) |
