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125KHz Wireless Smart Key Detector
This circuit will turn on an indicator light whenever it detects a smart car key
containing an RFID chip. (added 7/06)
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
10A car battery charger - The charger is suitable for lead-acid
car batteries and it is assembled in two units: a metal box with the
toroidal transformer, instrument, lights, etc, and a small plastic box
housing the voltage....(circuit added 05/08)
125kHz Wireless Smart Key Detector - This circuit will turn on an
indicator light whenever it detects a smart car key containing an RFID
chip.... [Designed by David A. Johnson]
12V to +/- 30V DC to DC Converter - This is a DC to DC converter
for car power amplifier. 12V input generates +30V and -30V output for preamp
or power amplifiers. Circuit uses SG3525 IC, Mosfets and switching power
supply…
13.8V Power Supply/ Charger - A supply for testing and working on car
amplifiers, up to about 500 Amps! (circuit added 6/07)
160 Baud ALDL Hardware Interface - This interface allows vehicle's
ALDL data stream to be displayed in real time on a PC using simple software.
hardware is designed to be able to be constructed by average hobbyist who has a
temperature controlled soldering iron and basic skills in constructing simple
electronics. It uses a minimum of (readily available) components consistent with good
electronics design. (added 4/05)
2 Watt Switching Power Supply - In this small switching power supply, a
Schmitt trigger oscillator is used to drive a switching transistor that supplies
current to a small inductor. Energy is stored in the inductor while the transistor is
on, and released into the load circuit when the transistor switches off. The output
voltage is dependent on the load resistance and is limited by a zener diode that stops
the oscillator when the voltage reaches about 14 volts. Higher or lower voltages can
be obtained by adjusting the voltage divider that feeds the zener diode. The
efficiency is about 80% using a high Q inductor.... [Bill Bowden's website]
3rd Brake Light - This circuit is NOT a pulser or flasher! What's so special
about this circuit? Well, the first third-brake light I installed I had to pull a wire
from the Third Brake Light all the way underneath the carpet to the brake-pedal-switch
and I thought it would be easier to pluck the signal of both brakelights via the
trunk. Bench-test your circuit first and apply power to the circuit,.... [Tony van
Roon's circuit]
3rd Brake Light Pulser - 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]
555-Timer Based Motorcycle Alarm - This circuit features an intermittent
siren output and automatic reset. It can be operated manually using a key-switch or a
hidden switch; but it can also be wired to set itself automatically when you turn-off
the ignition. By adding external relays you can immobilize the bike, flash the lights
etc. (Circuit design added 04/05/06)
6V Ultra-Bright LED Chaser - This is a spectacular but completely useless
project. It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very
briefly. The LEDs light-up going around and around since they are mounted in a circle
(on a CD), then they pause....(electronic design added 6/07)
