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Audio

Tweeter Crossover Circuit

Tweeter Crossover Circuit

Tweeter Crossover Circuit Description A single coil speaker is not good in handling high and low frequency at the same time. If we could filter out the low frequ[...]

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Miscellaneous

Phone "Hold" With Music

Phone "Hold"

Phone Hold With Music Circuit diagram This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on ho[...]

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Alarm Circuit

A Shed / Garage Alarm

A Shed / Garage Alarm

A Shed / Garage Alarm Circuit Description It has an extremely small standby current - making it ideal for battery-powered operation. This is particularly useful [...]

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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

Stereo Digital Volume Control

Stereo Digital Volume Control

Here is the circuit diagram of stereo digital volume control. This circuit could possibly be applied for upgrading your manual volume management within a stereo [...]

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Home&DIY

Door Bell with Flashing LEDs

Door Bell with Flashing LEDs

This is the door bell circuit with flashing LEDs to make the circuit more attractive. IC1 (NE555) is applied right here as being a clock generator. It is actuall[...]

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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

Lead Acid Battery Charger Circuit

Lead Acid Battery Charger Circu

Lead Acid Battery Charger Circuit Here is a lead acid battery charger circuit using IC LM317.The IC here provides the correct charging voltage for the battery. A[...]

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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 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[...]