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  • Ding-Dong Door Bell
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  • Electronic Dice Based Microcontroller Atmel AT89C2051

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Audio

Smart Sensitive Electronic Hearing Aid

Smart Sensitive Electronic Hear

This is the circuit diagram of electronic hearing aid featured with sensitive sound detection and energy saving, so this hearing aid will work in the long term w[...]

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Miscellaneous

Static Circuit Breaker / RFI Eliminator

Static Circuit Breaker / RFI El

This is the circuit diagram of Static Circuit Breaker.  Many a times you must have heard an undesired sharp sound emanating from the speaker, when any power app[...]

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Alarm Circuit

Water Level Indicator using 7 Segment LED

Water Level Indicator using 7 S

Here the water-level indicator which use a 7-segment display, to show the water level (low, half and full) in the tank. Moreover, a buzzer is utilized to warn yo[...]

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Lighting Circuit

LED Emergency Light

LED Emergency Light

This is LED emergency light that will turned on automatically when mains supply fails, and turned off when mains power resumes. This circuit produces highly brig[...]

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New technolgy

Uninterruptible Power Supply in an IC

Uninterruptible Power Supply in

Uninterruptible Power Supply in an IC Cymbet Corporation announced the availability of the EnerChip™ CC CBC3105 smart solid state battery. The CBC3105 combines[...]

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Radio Circuit

1 Watt Four Stage FM Transmitter

1 Watt Four Stage FM Transmitte

1 Watt Four Stage FM Transmitter This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifie[...]

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Meter Circuit

Frequency Meter / Frequency Counter 10Hz-60MHz

Frequency Meter / Frequency Cou

Component List: 1x 16x2 LCD Display with Green/Blue Backlight 1x PIC16F628A Pre-programmed MCU 1x PCB 1x 18-DIP IC Socket 1x 4.000MHz Crystal 1x LM7805 5V Voltag[...]

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Oscillator Circuit

50Hz 60Hz Frequency Generator Circuit Using Crystal Oscillator

50Hz 60Hz Frequency Generator C

50 Hz 60 Hz frequency generator circuit using crystal oscillator You can generate 50Hz or 60Hz using this frequency generator. This oscillator can be used as the[...]

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Sensor Circuit

Fire Alarm Using Thermistor

Fire Alarm Using Thermistor

Fire Alarm Using Thermistor Circuit Description In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases, its resistance dec[...]

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Digital Circuit

Digital Tachometer / RPM Meter

Digital Tachometer / RPM Meter

This is the circuit diagram of Digital Tachometer / Digital RPM Meter which can be used for cars or motorcycles with 2 and 4 stroke petrol engines with any numbe[...]

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Home&DIY

Ding-Dong Door Bell

Ding-Dong Door Bell

This ding-dong door bell circuit might become the simplest and cost-effective door bell circuit. The circuit is designed based on single IC 8021-2 which manufact[...]

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Control&Switch Circuit

8 Channel RF Remote Control

8 Channel RF Remote Control

8 Channel RF Remote Control This is an 8 Channel RF Remote Transmitter and Receiver that will allow to remotely control various electronic projects. RF Remote Co[...]

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Auto Circuit

Automatic Windshield Washer Control

Automatic Windshield Washer Con

Automatic Windshield Washer Control Circuit Description Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, [...]

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Battery Charger

12V 4A Solar Photovoltaic Battery Charger

12V 4A Solar Photovoltaic Batte

This is the circuit diagram of 12 Volts, 4 Amperes Solar Photovoltaic (PV) battery charger which will be suit to charge a 12V battery or accumulator. The circuit[...]

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Power Converter

12V to +-20V Automotive Power Converter (for audio amplifier)

12V to +-20V Automotive Power C

12V to +-20V Automotive Power Converter (for audio amplifier) The limitation of car supply voltage (12V) forces to convert the voltages to higher in order to pow[...]

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Power Inverter

100 Watt Inverter 12VDC to 220VAC with Mosfet

100 Watt Inverter 12VDC to 220V

This is another 100 watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which requ[...]

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Power Supply

12 Volt 30 Amp PSU

12 Volt 30 Amp PSU

12 Volt 30 Amp PSU Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 3[...]

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Basic Circuit

Operational Amplifier (Op-Amp) Basics

Operational Amplifier (Op-Amp)

Operational Amplifier (Op-Amp) Basics Circuit diagram The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and[...]