Electronics Area – Electrical and Electronics Tutorials and Circuits
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Electrical and Electronics Tutorials and Circuits
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What’s Static Electricity? – Examples
Static electricity is static, since it is a current that is going nowhere. Both, DC and AC current flow in some direction, but static electricity does not.
Magnetic Field – Magnetic Field Lines
Magnets. Charges in motion (electric current) behave like magnets (produce magnetic fields)
AC motor (AC Electric Motor) – Poles – Windings Relationship
AC motor (AC Electric Motor)
One of the characteristics of an AC motor is the number of rotor poles. This data will automatically give the number of windings that the motor has: # windings = # poles x 2.
Rain Alarm Circuit using 555 IC
Rain alarm circuit using 555
This Rain alarm circuit uses the water property to conduct electricity. To implement the water sensor we use two pieces of metal, which are placed close enough for a drop of water to let current flow between the metal plates
Car Burglar Alarm using two 555 timers
This is a simple Car Burglar Alarm circuit that uses a dual contact relay and two 555 timers, each of them working as a monostable multivibrator.
The alarm will activate the car horn, approximately 5 seconds after either door is opened and has not been properly closed.
Temperature effect on resistance
Temperature effects on resistance. The value of the resistance of a material varies with temperature change. For this reason, the circuit containing these elements should work in controlled environment
Temperature to Voltage Converter using Thermistor (PCB)
This circuit convert the sensed temperature by a thermistor into a voltage level. The circuit achieves an acceptable performance between 0°C and 24°C
Energy and Electric Power. Performance
Power is the speed at which work is done. Electric power is the multiplication of the current (amps) by the voltage (volts). P = I x V.
15V Power Source ON delay circuit
15V power source ON delay using LM317. This circuit uses the LM317 voltage regulator. It also uses a transistor and an a electrolytic capacitor
Humidity sensor circuit using the 555 timer
This simple humidity sensor circuit, shows us the humidity level that a ground under test has. To achieve the goal, a couple of probes are used.
12V to -12V DC converter circuit using 555
This 12 VDC to -12 VDC converter circuit gives -12VDC (negative 12 volts) from a power source of + 12VDC (positive 12 volts), with very few components.
Temperature Gauge Circuit Using LM324 (PCB)
The temperature gauge circuit is implemented using four comparators. We use the LM324 integrated circuit, which has four 741 operational amplifiers (op amps) in a single package.