Electronics Area – Electrical and Electronics Tutorials and Circuits
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Electrical and Electronics Tutorials and Circuits
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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 temperature to voltage converter circuit, convert the sensed temperature by a thermistor into a voltage level.
The circuit achieves an acceptable performance between 0 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 using a 555 timer, shows us the humidity level that a ground under test has. To achieve the goal, a couple of probes are used.
These probes are placed on the ground to be tested.
12V to -12V DC converter circuit using 555
12 VDC to -12 VDC converter circuit with a 555 IC.
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.
How to build a NAND Gate with Transistors & Diodes?
This circuit simulates the operation of a NAND gate with two or more inputs. (There is one diode for each input. D1, D2, …)
Full wave rectifier using center tapped transformer
Full wave rectifier using center tapped transformer
This full wave rectifier requires a center tapped transformer. This additional end on the secondary winding of the transformer divides the voltage in this winding into two equal voltages. This additional end is grounded.
Guitar Synthesizer using CD4046
Guitar Synthesizer using CD4046. To achieve the objective, the CMOS PLL CD4046 integrated circuit is used, producing an unusual sound from a guitar which sounds very similar to a synthesizer.
Half Wave Voltage Doubler
Half Wave Voltage Doubler
Voltage doublers produce twice as much DC voltage as a common rectifier could produce. The advantage of the Half Wave voltage doubler is that it has a line, which is common to the input and output