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LED or Lamp Pulsar Circuit LED or Lamp Pulsar Circuit

Astonishing effect 4.5V supply This circuit operates a LED in pulsing mode, i.e. the LED goes from ...

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Simple Hybrid Audio Amplifier Simple Hybrid Audio Amplifier

The debate still goes on as to which are better, valves or transistors. We don’t intend to get invol...

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IrDA Interface IrDA Interface

Many modern motherboards are equipped with an infrared data interface compliant with the IrDA stand...

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Linear RF Power Meter Linear RF Power Meter

The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used ...

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ESR & Low Resistance Test Meter ESR & Low Resistance Test Meter

As electrolytic capacitors age, their internal resistance, also known as "equivalent series r...

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Hard Disk Switch Hard Disk Switch

In these times with viruses and other threats from the Internet it would be nice to have reassuranc...

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Computer Off Switch Computer Off Switch

How often does it happen that you close down Windows and then forget to turn off the computer? This...

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Mobile Phone and iPod Battery Charger Circuit Mobile Phone and iPod Battery Charger Circuit

Charge your iPod without connecting it to a computer! Using the USB port on your computer to cha...

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Keyboard/Mouse Switch Unit Keyboard/Mouse Switch Unit

Unplugging or re-connecting equipment to the serial COM or PS2 connector always gives problems if t...

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USB Operated Home Appliances USB Operated Home Appliances

When turning a computer on and off, various peripherals (such as printers, screen, scanner, etc.) o...

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Courtesy Light Courtesy Light

15 seconds delayed switch-off, A good idea for bedroom lamps   This circuit is intended to let the ...

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IC Controlled Emergency Light With Charger Circuit IC Controlled Emergency Light With Charger Circuit

Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC ...

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Car Boot Lamp Warning (ICM7556) Car Boot Lamp Warning (ICM7556)

On many cars, the boot light will not go out until the lid is properly closed. It is all too easy w...

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Light-Operated Light Switch Light-Operated Light Switch

Here is a light-operated, remote-controlled solidstate switch to operate a lamp. During darkness, th...

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Inverter Circuit For Soldering Iron Inverter Circuit For Soldering Iron

Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) In th...

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Active High Pass Filter Using LM741 Active High Pass Filter Using LM741

This is active high pass filter circuit for 327Hz frequency using LM741. It will use to build Harmo...

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Dry Cell Battery Charger Using LM741 Dry Cell Battery Charger Using LM741

This is Dry Cell Battery Charger Circuit. That can use charger battery get that about 12 hour. When...

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Telephone Conversation recorder Telephone Conversation recorder

This circuit enables  automatic switching-on  of  the  tape  recorder  when  the  handset  is  lifte...

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Dual Relay Driver Board Circuit Schematic Dual Relay Driver Board Circuit Schematic

A simple and convenient way to interface 2 relays for switching application in your project. This r...

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Courtesy Light Extender Courtesy Light Extender

In essence, this circuit is a 15 to 20-second courtesy light extender for cars. It is activated in ...

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A Friendly Charger Schematic for Mobile Phones A Friendly Charger Schematic for Mobile Phones

Charges and protects your mobile phone from voltage spikes and short-circuit Most mobile chargers d...

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Power Flip-Flop Using A Triac Power Flip-Flop Using A Triac

Modern electronics is indispensable for every large model railroad system, and it provides a soluti...

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Mains Voltage Monitor Mains Voltage Monitor

Many electronics hobbyists will have experienced the following: you try to finish a project late at...

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Mains Slave Switcher Mains Slave Switcher

There are many situations where two or more pieces of equipment are used together and to avoid havi...

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12V Halogen Dimmer 12V Halogen Dimmer

use a 12V 20W halogen lamp (MR16) and a 4.2Ah SLA battery for my bike light system. The battery has...

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Intelligent Electronic Lock Intelligent Electronic Lock

This intelligent electronic lock circuit is built using transistors only. To open this electronic lo...

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Mains Slave Switcher II Mains Slave Switcher II

As a guide, a one-inch reed switch with 40 turns reliably switched on with the current flowing thro...

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Mains Operated LED Circuit Schematic Mains Operated LED Circuit Schematic

Small in size! Big in use Here is a simple and powerful LED circuit that can be operated directly f...

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