Dual-tone car horn
An LM556 dual oscillator/timer, U1, configured as a two-tone oscillator drives U2, a dual 4-watt amplifier. One of the oscillators, pins 1 to 6, contained in U...
Car Water Temperature
The circuit measures the car water temperature. CA3161 is a counter and 7segment driver to display amount of temperature on 7segments. The temperature sensor is...
12V Led Car Battery Monitor
This simple circuit makes it posible to monitor the charging process to a higher level. Final adjustsments are simple and the only thing needed is a digital vol...
Car Speed limit Alarm
This circuit has been designed to alert the vehicle driver that he has reached the maximum fixed speed limit (i.e. in a motorway). It eliminates the necessity o...
Car Large capacitor charge controllers
One-farad capacitors require some care. It`s a common knowledge that they must be pre-charged with a current-limiting resistor before plugging in. It is less co...
Car PC MP3 Player
This is a computer I built for my car, its an MP3 music system but can also do other tasks. Based around a super-small sub-micro ATX motherboard from a computer...
Model Train Diesel and Horn Circuit
The main power supply to the system must be a regulated 12 volts DC with a minimum input from the train control AC or DC power supply of 13.5 VAC connected to p...
Model Train Diesel and Horn Circuit
The main power supply to the system must be a regulated 12 volts DC with a minimum input from the train control AC or DC power supply of 13.5 VAC connected to p...
Car battery voltage monitor
An ECU must have a way to monitor battery voltage. Here is a simple op-amp based circuit which will illuminate the LED when the battery voltage drops to a certa...
Car battery voltage monitor
An ECU must have a way to monitor battery voltage. Here is a simple op-amp based circuit which will illuminate the LED when the battery voltage drops to a certa...
Automatic Brightness Switch
Driving the highway with your high-beam headlights can really increase your visibility, but can be a blinding hazard for other drivers. This simple circuit can ...
Automatic Brightness Switch
Driving the highway with your high-beam headlights can really increase your visibility, but can be a blinding hazard for other drivers. This simple circuit can ...
Wideband Display
This is the construction guide for the 5301 wideband fuel mixture display kit. The 5301 is the Tech Edge version (rather than the Jaycar version) of the modifie...
Wideband Display
This is the construction guide for the 5301 wideband fuel mixture display kit. The 5301 is the Tech Edge version (rather than the Jaycar version) of the modifie...
Interfacing Sony control stick to Empeg
You may find that there are too few, if your power is very noisy (as can happen in a car environment) it may help to place a 0.1uF and/or 10uF capacitor before ...
Interfacing Sony control stick to Empeg
You may find that there are too few, if your power is very noisy (as can happen in a car environment) it may help to place a 0.1uF and/or 10uF capacitor before ...
Simple Polarity Tester
This tester can be used to check the polarity of any power source, and is therefore very useful when installing automotive equipment, alarm systems or anything ...
Simple Polarity Tester
This tester can be used to check the polarity of any power source, and is therefore very useful when installing automotive equipment, alarm systems or anything ...
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 w...
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 w...