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Electronic Combination Lock - Very simple circuit allows up to 9 digits . . . [Circuit by Stepan Novotill]
Electronic combination lock based on PIC - 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. . . . [Peter
Jakab, Electrical Engineer, Engineer of Informatics]
Electronic Combination Lock with AVR -
CodeLock AVR electronic combination lock is realised with Atmel AVR microcontroller AT89C2051 or AT90S2313 or ATtiny2313 or
ATtiny45. Program in hex code is 2 kB long. One user code (Ver. 1) is consisted of 1 to 8 digits. One user code (Ver. 2. 1,
2. 2, 2. 3) is consisted of 1 to 4 digits. If you buy the chip (Ver. 2. 1, 2. 2, 2. 3) than you can enter 1 or 8 user codes
that are consisted of 1 to 9 digits.
. . . [Designer's name not given]
Electronic Door Release - This circuit is designed to operate an electrical door-release mechanism, but it will have
other applications. When you enter the four-digit code of your choice, the relay will energize for a preset time period. Use
the relay contacts to power the release mechanism. The standby current is virtually zero, so battery power is a realistic
option. . . . [Circuit designed by Ron J.]
Embedded Automotive (6V to 36V Input) to 5V/3.3V/1.8V/1.2V Output Peak-Power Controller using
Two Supercapacitors - The LTC4425 is a
constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer
battery, a USB port, or a 2. 7V to 5. 5V current-limited supply. The part operates as an ideal diode with an extremely low
50mΩ on-resistance making it suitable for high peak-power/low average. . . [Linear Technology App Note, Mar 24th 2010]
Emergency Light & Alarm - Powered by two
AA NI-CD batteries; Four switchable options. . . [Flavio Dellepiane's web site]
Engine Control unit Schematics - . . .
[No designer name given]
Engine
Cooling - STMicroelectronics-Application. . .
Engine
Management Diesel - STMicroelectronics-Application. . .
Engine
Management Gasoline - STMicroelectronics-Application. . .
Exhaust Gas Recirculation - STMicroelectronics-Application. . .
Fake Car Alarm Light - Whenever the car’s ignition is turned off, this circuit activates a flashing LED, which can be
positioned to appear as an active alarm system . . . [Circuit by Dave Johnson P.E., 10/16/05]
Faulty Car
Indicator Alarm - Before taking a turn, either left or right, car
drivers need to switch on the car turn indicator lamps so that the approaching vehicle drivers can take precaution
accordingly. An accident is likely to occur in case your car turn indicator lamps fail to glow due to some reason or the
other. Here is a circuit that sounds an alarm if your turn indicator lamps dont glow, helping you to safeguard against any
accident. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
FCD (Fuel Cut Defencer) - . . .
Five output, Automotive (Vehicular) power
system, with dual Li-Ion battery chargers - . . . [Steve Hageman's
Design Resource]
Flashing / pulsing
third brake like for cars - . . .
Flashing High
Intensity LED 3rd Brake Light - This circuit to make a flashing3rd
brake light assembly was designed to be easy to locate all the needed components and reasonably in expensive to build. . .
[National Semiconductor]
Flashing Indicators - Need to flash "turn indicators" using a 555 and a single 20 amp relay. Here is our suggestion.
The timing resistor needs to be selected for the appropriate flash-rate. . . . [Name of designer is not given]
Flashing Light to
simulate Car Alarm - Whenever the car’s ignition is turned off,
this circuit activates a flashing LED, which can be positioned to appear as an active alarm system . . . [Hobby Circuit
designed by David Johnson P.E., 10/16/05]
Flashing/Pulsing third Brake lite for
cars - Several years ago these flashers were introduced in the
automotive industry as part of the third brake light and contained strobe lights (and strobing continuously for the duration
of pressing the break pedal) but got abandoned almost immediately sometime later because of the 'strobe' effect it has on
some people. This circuit has become obsolet since much better circuits are available these days without the 'lag' in between
brakes caused by R4 and C3. One of the circuits is listed below. . . [Tony van Roon's circuit]
Flashing-Cum-Running Light - This circuit generates flashing lights in
running pattern. In conventional running lights, the LEDs glow one by one. In this circuit, the LEDs flash a number of times
one by one. The circuit comprises two astable multivibrators (IC1 and IC3) and a decade counter (IC2). Astable multivibrator
IC1 produces approximately 0. 72Hz clock frequencies, which are given to decade counter IC2. . . . [by A. SIVASUBRAMANIAN-
Fuel Injector Pulse
Width Monitor - Shown below is the schematic for the pulse width
monitor. The heart of the circuit is the transistor current source which charges cap C10 to form an integrator. The theory is
that the cap is charged and the voltage across it increases linearly for the amount of time that the injector is energized.
As the injector is switched off the voltage in C10 is stored in cap C9 and then C10 is reset to 0 volts to get ready for the
next cycle. The output of the circuit is the voltage across cap C9, this voltage is fed directly into U3 the bar graph chip
to be displayed as a value betw1een 1-10 on the LEDs. . . . [Designer's name not included] |
