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Audio

Three Transistor Headphone Amplifier - Class AB

Three Transistor Headphone Ampl

Part's List: R1 - 100K R2 - 330 R3 - 100 R4 - 22(2 - 4.5V) R4 - 100 (5 - 12V) C1 - 4.7uF C2 - 4.7uF C3 - 100 - 1000uF C4 - 220uF P1 - 100K D1, D2 - 1N4148 Q1, Q2[...]

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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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Lighting Circuit

Low Current LED Flasher circuit

Low Current LED Flasher circuit

This is a low current flasher consumes only a few Micro amperes current and lights a high bright LED day and night for more than one year. This can be used in sw[...]

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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

Simple 1.5V Square Wave Generator

Simple 1.5V Square Wave Generat

Simple 1.5V Square Wave Generator This simple circuit generates a good and stable 1V peak-to-peak square wave at 100Hz, 1KHz and 10KHz using a single 1.5V cell a[...]

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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 Inverter

12V DC to 220V 100W Inverter with 4047 IC & IRF540

12V DC to 220V 100W Inverter wi

12V DC to 220V 100W Inverter with 4047 IC nbsp; This is 100W inverter circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055 transistor.Power output is 100[...]

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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[...]