Mains line frequency meter circuits

Engineeering Projects
panel frequency meter circuit

Generally, the standard line frequency in some countries is 50HZ or in some countries 60HZ, which may vary from time to time. Due to this varying nature of frequency, sensitive equipment may start malfunctioning, and the requirement result we may not get. New here is a simple mains line frequency meter circuit designed and verified at BEP (Best engineering project) lab used to measure the frequency of AC mains. Circuit description mains line frequency meter circuit The circuit of the mains line frequency meter is built around timer IC2 (NE555),…

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Light Controlled Digital Fan Regulator Circuit

Engineeering Projects
light controlled digital fan regulator circuit

Mans are born of habit, and we all want comfortable. At night while sleeping we often switch of the light. But sometime we used to increase or decrease the speed of fan. And it is very difficult to trace the switch board in a dark room at night and to wake-up from bed is also irrigative. By keeping this problem in mind the group of electronics geek at Dreamlover technology designed and verified a electronics project called light controlled digital fan regulator circuit. You can also check this awesome project IR…

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Frequency Generator and Divider circuit

Engineeering Projects
circuit diagram of frequency divider

What are Frequency Generator and Divider Circuit? A frequency generator is a circuit that generates a frequency and a divider circuit divides the generated frequency with various factors to get different frequency values. Various assembled frequency generators and divider circuits are available in the market but they are quite expensive to buy. The group of electronics geeks at dream lover technology designs a low-cost square wave signal generator and divider circuit. The frequency of 1 Hz, 10 Hz, 100 Hz, 1 kHz, 100 kHz, and 1 MHz are obtained at…

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All in One Tester Circuit

Engineeering Projects
circuit diagram of handy tester

All in one multi-tester is quite expensive which may not affordable for every electronics beginner. Now, here is s cheap all-in-one tester circuit that can be used to test the condition of almost all the electronics components from the basic resistors to advance ICs. The circuit all in one tester is used to detect polarity, continuity, logic state, and also activity of multivibrator. Description of All in One Tester Circuit The circuit of the all-in-one tester is so simple that it can also understand by beginners. The circuit of all…

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Multiband CW Transmitter

Engineeering Projects
circuit diagram of multiband cw transmitter

A frequency oscillator is used to generate frequency oscillation, and a radio frequency oscillator is used to generate high-frequency which is known as a carrier wave. The circuit multiband CW transmitter is a continuous wave (CW) transmitter for transmitting morse code signal in a shortwave band. The circuit posted here is a variable frequency oscillator (VFO) whose frequency can be varied from 5.2 MHz to 15 MHz. The transmitted signal from this circuit can be received in a short wave band by any radio receiver. Circuit Description of Multiband CW…

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DC Motor Control Circuit

Engineeering Projects
circuit diagram of dc motor controlling using single switch

The various motor control circuit is already available on the internet and this is also not a new idea for the electronics hobbyist. The circuit of the DC Motor Control Circuit, published here is different from another circuit available for motor control because it let you run a DC motor in a clockwise or anti-clockwise direction and stop it using a single switch. DC motor control circuit has also another advantage i.e. for proper operation of the motor this circuit provides a constant voltage. Here we use three LEDs LED1…

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Dome Lamp Dimmer Circuit

Engineeering Projects
circuit diagram of dome lamp dimmer

As we have already published various types of lamp dimmer like Light Dimmer Circuit using Capacitor and Touch Dimmer Circuit using triac etc. Now here is a lamp dimmer for the dome lamp in the car, which gives a fairly linear control over the lamp brightness from low to high intensity. The main advantage of the project dome lamp dimmer circuit is it consumes little power because it is a pulse-width modulated chopper circuit. You can also control the intensity of a halogen bulb or control the speed of a…

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Voltage window comparator Circuit follows reference voltage

Engineeering Projects
voltage window comparator follow reference voltage

The use of window comparators are essential in the test circuits which perform the ‘GO-NO-GO’ tests for the various electronic components likes zener diodes, transistors, relays etc. The upper and lower threshold voltages are set for the window comparators depending upon the values and tolerances of the components to be tested. Here is a window comparator circuit in which the window width is automatically adjusted to be a fixed percentage of the input reference voltage Vref proportional to the nominal value of the component under test and produces an upper…

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Clap Switch Circuit Using 555

Engineeering Projects
circuit diagram of clap operated electronics switch

The clap switch circuit is not a new idea for the electronics hobbyist. Previously we had posted a simple clap-operated switch. Now, here is a clap switch circuit using 555, used to control any appliance by clapping five times. We used here decade counter for the right clap code i.e. only the right clap activates the appliance (five claps within the preset time interval of 10 seconds). Description of Clap Switch Circuit Using 555 The clap switch circuit using 555 is built around timer IC 555, decade counter IC CD…

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Charging Reminder for Emergency Light

Engineeering Projects
charging reminder for emergency light

When the battery is kept in the discharge state for a long period, irreversible chemical reaction takes place reducing the capacity of the battery so that eventually the battery becomes useless. No protection circuit can stop self discharge of the battery and only trickle charging on compensate for it. Here is a circuit charging reminder for emergency light to inform the user that the battery has discharged itself below the safe level. The discharge characteristics of a dry battery, as supplied by its manufacturer indicate that the battery should not…

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