AUTO and VEHICLE CIRCUITS
12 Volt Automotive Inverter
This circuit will allow you to operate small devices like laptop computers inside your automobile without an expensive automobile power supply. The circuit takes advantage of the fact that power transformers are linear devices and can be used to step up as well as step down.
Speed limit Alert
Wireless portable unit Adaptable with most internal combustion engine vehicles
Automatic Speed Controller for Fans & Coolers
The device presented here makes the fan run at full speed for a predetermined time. The speed is decreased to medium after some time, and to slow later on.
Park-Aid
Three LEDs signal bumper-barrier distance Infra-red operation, indoor use
Park-Aid Modification
Three-step beeps signal bumper-barrier distance Infra-red operation, indoor use
Headlights Timer
Pushbutton activated Very simple circuitry
LED driven tail/brake Light Cluster
Constant current circuitry 12V Battery operation
Sequential Brake/Turn Lights
Bar-mode LED-cluster sequencer Can drive up to 16 clusters
Power Flasher
Suitable for alerting purposes Drives 12V Car bulbs
Automotive link uses single wire
In the automotive industry, in which the goal is to produce cars with simpler, lighter wiring looms, any interface that uses just one wire instead of two offers a distinct advantage. The circuit implements a bidirectional link using a single wire, with the car's chassis or ground conductor providing a negative return path.
Automotive Voltage Indicator
Monitors battery voltage Three-LED Display
Sequential Turn Lights Driver
Four-LED left and right sequence Particularly suited to motorcycles
Automotive Multiplex Wiring
vehicle wiring by National Semiconductor Application
Car Subwoofer Driver
22W into 4 Ohm power amplifier Variable Low Pass Frequency: 70 - 150Hz
Brake Light Signal Module
Generates 4 short flashes, followed by a steady on light Can drive LED Arrays at currents up to 1 Amp
5301 Wideband Fuel Mixture Display
This is the construction guide for the 5301 wideband fuel mixture display kit.
80188XL Engine Tachometer
Either transistor or optical to generate ADC compatible voltage levels. These are basically frequency to voltage converters. This adapts the input to the LM2917 chip or 555 system. The design is flexible. See interfacing specifications for compatible voltage ranges for ADC conversion. (Under development)
Automatic Dual Output Display
This circuit lights up ten bulbs sequentially, first in one direc- tion and then in the opposite direction, thus presenting a nice visual effect. In this circuit, gates N1 and N2 form an oscillator. The output of this oscillator is used as a clock for BCD up/down counter CD4510 (IC2).
Car Battery Charger
This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.
Automotive link uses single wire
In the automotive industry, in which the goal is to produce cars with simpler, lighter wiring looms, any interface that uses just one wire instead of two offers a distinct advantage.
Simple Car Battery Charger
Simple Car Preamplifier and Artificial Earth
The circuit contains two audio preamps, with a maximum gain of 21dB suitable for vehicles.
Solar Car Array Controller Schematic
Solar Car Battery Monitor Schematic
Headlight Reminder
A +12V Switched sidelight feed, via a buzzer to the drivers door light switch, you then need to put a diode in the door circuit to stop the other doors operating the buzzer.
Engine Control unit Schematics
These remain here on my site although badly dated and not currently in use by my ECU. They were derived very early in my initial experiments.
Portable CD Player Adapter for Car
use to convert 12V supply from automobile's battery to 9V to power a cd player.
Fuel Injector Pulse Width Monitor
Here is a picture of the faceplate that holds the LED bargraphs for air/fuel and pulse width as well as the pot to control the fuel mixture above 7psi boost. The switch allows either the primary or secondary injector pulse to be monitored. The faceplate is made of polished aluminum. The air/fuel (O2) monitor, pulse width monitor, and fuel controller are all on one printed circuit board.
Ultrasonic Parking Sonar
automatic switch on on rear gear,it works on the sonar principle, sending an ultrasound burst and listening for first echo
Oxygen Sensors
When they go bad your automobile runs poorly, learn about them and build a substitute for diagnostics or off-road use.
Flashing High Intensity LED 3rd Brake Light
This circuit to make a flashing 3rd brake light assembly was designed to be easy to locate all the needed components and reasonably in expensive to build.
Wireless Auto Tachometer
Anyone performing their own automobile tune-ups knows how important it is to know your engines speed. With this tachometer, you can measure your engines speed without any connections or annoying timing lights.
