EEprom IC’s

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EEPROM (also written E2PROM and pronounced "e-e-prom," "double-e prom,") stands for Electrically Erasable Programmable Read-Only Memory and is a type of non-volatile memory which used in   TV,Computers and other electronic devices to store small amounts of data that must be saved when power is removed.EEPROM is a special type of PROM. EEPROM can be both erased and programmed with electrical pulses.Since it can be both electrically written into and electrically erased, the EEPROM can be rapidly programmed and erased in circuit for 

Adjustable Precision Shunt Regulator(TL431/AP431 family)

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The TL/AP431 family is 3-terminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V(VREF) up to 36V scarcely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.2Ω.

Download ExpressPCB

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The ExpressPCB schematic and PCB design software is very quick to learn and completely free! Download a fully functional version here.    Download 

DipTrace

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DipTrace is an advanced PCB design software application that consists of 4 modules PCB Layout with efficient auto-router and auto-placer, schematic capture, component and pattern editors that allow you to design your own component libraries. DipTrace has a powerful automatic router, superior to many routers included in other PCB layout packages. It can route a single layer and multilayer circuit boards, and there is an option to auto route a single layer board with jumper wires, if required.

PCB123 PCB design software

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The most robust of our PCB design services, PCB123 is the choice for global industry leaders. Download PCB123 4.1.16 PCB design software and quote your board fab and parts while you work. Version 4.1.16 delivers NXP certified parts, and more than 500,000

How to make a simple L.E.D cube

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LED cube is very famous because of its beauty. Here is the circuit diagram for very simple LED cube. In this circuit we used 27 white LEDs. The 4020 IC is a Simple 14 stage binary counter and we have used here 9 outputs. Each output drives 3 white LEDs in series and we have omitted a dropper resistor as the chip can

Three band active tone control with TL 082-N

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TL 082-N Wide Bandwidth dual JFET input Operational Amplifier

This device is low cost, high speed, dual JFET input operational amplifier with an internally trimmed input offset voltage (BI-FET II™ technology). They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input

DVD Signals RF modulator Circuit

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The DVD player is a high performance unit designed to be used in a variety of setups. It has a plentiful variety of video output (composite, S-video, Component) and audio output (analog, digital optical, and digital coaxial) 

SIMPLE FLASHER

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This simple circuit flashes a globe at a rate according to the value of the 180R and 2200u electrolytic capacitor.

INCREASING THE OUTPUT CURRENT with 3055

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The output current of all 3-terminal regulators can be increased by including a pass transistor. This transistor simply allows the current to flow through the collector-emitter leads. The output voltage is maintained by the 3-terminal regulator but the current flows through the "pass transistor." This transistor is a power transistor

TRANSFORMERLESS POWER SUPPLY

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This clever design uses 4 diodes in a bridge to produce a fixed voltage power supply capable of supplying 35mA. All diodes (every type of diode) are zener diodes. They all break down at a particular voltage. The fact is, a power diode breaks down at 100v or 400v and its zener characteristic is not useful. But if we put 2 zener diodes in a bridge with two ordinary power diodes, the bridge will break-down at the voltage of the zener. This is what we have done. If we use 18v zeners, the output will be 17v4. When the incoming

DARK DETECTOR with beep-beep-beep Alarm

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This simple circuit detects darkness and produces a beep-beep-beep alarm. The first two transistors form a high-gain amplifier with feedback via the 4u7 to produce a low-frequency oscillator. This provides voltage for the second oscillator (across the 1k resistor) to drive a speaker.

Dark-activated 230V Lamp

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This device allows one or more lamps to illuminate at sunset and turn off at dawn.

Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is set by R2 and C1.

When the light hits R1, the photo resistor assumes a very low

Flashing 230V Lights

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This design can be of some interest for those wanting striking light signs, as it can drive up to three 230V lamp strings in three operating modes.

The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer (T1) and a full wave rectifier (D5 & D6): Zener diode D4 was added to clamp the dc voltage to 15V maximum.

Triacs D7, D8 and D9 are insulated from the control circuitry by means of Optoisolators IC2, IC3 and IC4. IC1A, B and C are wired as monostables and cascaded in order to obtain a rotating sequence when the Mode switch SW1 is set in the Rotate position.

Programmable LED Flasher

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uses only one chip and can be useful if a not very precise number of flashes of the LED is needed before reverting to the steady-on state. In fact, connecting D1 Anode to different output pins of the IC, the steady-on state of the LED will be obtained after 2, 4, 8, 16 flashes and so on.

Connecting D1 Anode as shown, the LED will start flashing at about two times per second after power-on and will revert to the steady state after 8 flashes. P1

Fading LEDs

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This circuit operates two LED strips in pulsing mode, i.e. one LED strip goes from off state, lights up gradually, then dims gradually, while the other LED strip does the contrary. Each strip can be made up from 2 to 5 LEDs at 9V supply.

Access Multiple Accounts at the same time in the Same Browser

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It’s a good news for the gmail users that finally they can access multiple gmail acocunts at a same time in the

same browser. This was a much awaited feature for

LOSS-FREE SUPPLY PROTECTOR

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Any diode-based circuit that protects against reversal of the supply polarity introduces a certain voltage drop.Also, when relatively high currents are involved, the choice of a suitable diode,and its dissipation, may become problematic.

This circuit utilized a relay contact to break the positive supply line when the input voltage has the wrong polarity. the coil voltage of the relay may be lower than the input voltage, because Re is activated within a fiw milliseconds, and then receives the correct coil voltage via T1-D1. Since

Difference between GBIC & SFP(mini gbic)

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 A gigabit interface converter (GBIC) is a standard for transceivers, commonly used with Gigabit Ethernet and fibre channel in the 1990s. By offering a standard, hot swappable electrical interface, one gigabit port can support a wide range of physical media, from copper to long-wave single-mode optical fiber, at lengths of hundreds of kilometers.The small form-factor pluggable (SFP Fiber Optic Transceiver) is a version of Mini-GBIC. It supports data rates up to 10 Gbit/s. The SFP Fiber

VIDEO BUFFER/REPEATER

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This universal video amplifier is intended as a buffer/repeater in a long coaxial cable to keep the signal at a reasonable level. Its gain is about 6 dB. The circuit is built from readily available components: some transistors and a few others. The circuit consists of a two-stage amplifier, T1 and T2, and an emitter follower that functions as impedance converter. The bandwidth at -3 dB is not less than 20 MHz. Current consumption at a supply voltage of 12 V amounts to