Thursday, January 9, 2014

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Simple 4 Channel Video Amplifier using NJM2582

A very simple 4 channel video amplifier electronic circuit project can be designed using NJM2582 ic suitable for video applications with SCART connector . Design of the circuit is very simple and require few external electronic parts .

Circuit diagram :

4 channel-video-amplifier Circuit Daigram

Simple 4 Channel Video Amplifier Circuit Diagram

Some features of the NJM2582 are : Operating Voltage ±5V, +5V, +11V ; 6input 4output , 2input 1output Video SW , Internal LPF , 6dB Amplifier , Internal 75Ω Driver Circuit , DC output for SCART (FUNCTION SW, BLANKING) .

Friday, December 27, 2013

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The normal working hours of the Cell Phone Jammers

The normal working hours of the Cell Phone Jammers
Therefore, the machine work, be sure to add some water to the cooling water pump in. When the power is turned on, the pump started working equipment operational. Recycled water should be pure.
Neodymium laser emission wavelength and energy level structure of neodymium ion characteristics 4.He- Ne laser and the role of the different components of 5.We advise you to take out the battery from the Cell Phone Jammers if you don’t use it for a long time. He-Ne laser lines in the competition 3.39μm, 1.15μm, 632.8nm lines are strong, start-line resonator dielectric film by the wavelength selection mirror line decisions are strong, μ μ fixed. 3.39μm and 632.8nm on the same level, there is strong competition between the lines, and 3.39μm also has the same upper level, there is strong competition between the lines, μ μ more Strong gain coefficient in the laser is longer, in addition to the wavelength selection mirror, but also adding dispersion prism, a stronger gain coefficient.If the machine control system is not connected to power, the user must turn off the switch and control unit and data cable. b. If the data cable between the computer and the laser machine is not connected, close the master switch, connect the data cable. 4 in the process of carving and cutting overhead lines if a communication line problem, replace the communication line.Cell Phone Jammers is a burgeoning product. If the laser machine and the computer placed on the ground is not good, the user should the laser machine and the computer placed on the ground is good. What is the problem if the application software, the user should be re-placed the software and reinstall the driver software. If the laser and the ambient humidity and dust above the conflict console, cables and internal wiring, before running the machine clean and warm. If the external power supply instability and confusion, users should use a stable power supply. If the computer system error, reinstall the system or replace the computer. If the surrounding environment has a high frequency of contact, please stay away from this environment. When the carving or cutting, production can not accept the alternative or partial loss or partial file if design work beyond the width of the laser machine, the user should be designed to reduce the width and wide, so that in the appropriate range. If the document out of many, the user should be appropriate to reduce the resolving power, scanning speed or acceleration prior to the change in the absence of early scan before scanning.There are not many researches on Cell Phone Jammers originally.If the laser path deflection mirror and lens, users need to adjust the optical path.Laser pointing is the rudimental function of Cell Phone Jammers. (2) cutting / engraving depth is not enough if the laser output power is too low, the user should be increased through the control panel power output if the cutting / engraving speed is too fast, user software should be adjusted to reduce the cutting / engraving speed. If the optical path of mirrors and lenses on the overalls and dust contaminated by, or on the lens or mirror reflective layer destruction, the user should clean or replace the mirror if the focus point is not in the correct position, the user should be adjusted.

Thursday, December 26, 2013

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Simple Strip LED Lamp

Strip LEDs are available in different colours powered by direct current (DC) source. These LEDs  are available as surface mount devices with current limiting resistors. Usually there are 300 LEDs in a 5-metre strip. The strip can be cut into pieces so that  the bits having three or four LEDs can  be used with 12V DC source. The circuit given here uses the strip LEDs to  make an automatic white LED lighting  source.

Simple Strip LED Lamp Circuit diagram:

Simple Strip LED Lamp-Circuit Diagram

The circuit is powered by a capacitor power supply connected to AC mains. Capacitor C1 drops the 230V  AC, which is further rectified by the bridge rectifier module and is made ripple-free by C2. Zener diode (ZD1) provides 12V DC to the comparator circuit. Resistor R1 is important in the  power supply as it provides discharge path to the voltage stored in capacitor C1 after the circuit is unplugged from  mains.
The automatic working of the circuit is based on the light-sensing property of the light-dependent resistor (LDR). Operational amplifier CA3140 (IC1) is used as a comparator with two potential dividers in its inverting and non-inverting inputs. LDR1 and  resistor R3 form one potential divider  that provides a variable voltage at the  inverting input pin 2 of IC1. Second  potential divider comprises resistors  R4 and R5, which provide half of the  supply voltage (6V) to the non-inverting pin 3 of IC1. The output of IC1 depends on voltage level at inverting  input pin 2 of IC1 as explained below.

In daylight, LDR1 has low resistance and the voltage at inverting input (pin 2) of IC1 is more than that of non-inverting input (pin 3). This makes IC1 output low, which drives transistor T1 into cut-off condition and strip LEDs do not glow. However, at night the light incident on LDR1 is low and its resistance is high. The voltage at inverting input of the comparator decreases, making it lower than the voltage at non-inverting input. This makes IC1 output high. Transistor T1 goes into saturation,  thus connecting cathodes of LEDs to  ground. All the LEDs in the strip turn  on and remain that way till morning.

Assemble the circuit on a general-purpose PCB and enclose it in a suit-able shock-proof case. Strip LEDs are available in ribbon-shaped form. Use 5cm bits (two bits) having three  LEDs each. The strip can be cut at supply-contact points. Strip LEDs are arranged on a flexible belt with  double-sided adhesive on the back  side, so it can be glued to any surface.  Connect the LED strip in the circuit  with correct polarity.
EFY note. Since the circuit uses 230V AC, there is a risk of electrical shock. Do not touch or troubleshoot when the circuit is plugged in.Before connecting the circuit to the power supply section, test it using 12V DC from a battery or DC power supply.


Source:  http://www.ecircuitslab.com/2012/05/simple-strip-led-lamp.html

Wednesday, December 25, 2013

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Solar Powered High Efficiency Battery Charger

This is a simple NiCd battery charger powered by solar cells. A solar cell panel or an array of solar cells can charge a battery at more than 80 % efficiency provided the available voltage exceeds the ‘fully charged’ battery voltage by the drop across one diode, which is simply inserted between the solar cell array and the battery. Adding a step-down regulator enables a solar cell array to charge battery packs with various terminal voltages at optimum rates and with efficiencies approaching those of the regulator itself.

However, the IC must then operate in an unorthodox fashion (a.k.a. ‘Elektor mode’) regulating the flow of charge current in such a way that the solar array output voltage remains near the level required for peak power transfer. Here, the MAX639 regulates its input voltage instead of its output voltage as is more customary (but less interesting).

Circuit diagram:

Solar-Powered High Efficiency Charger circuit schematic
Solar-Powered High Efficiency Charger Circuit Diagram

The input voltage is supplied by twelve amorphous solar cells with a minimum surface area of 100 cm2. Returning to the circuit, potential divider R2/R3 disables the internal regulating loop by holding the V-FB (voltage feedback) terminal low, while divider R1/R2+R3 enables LBI (low battery input) to sense a decrease in the solar array output voltage. The resulting deviation from the solar cells’ peak output power causes LBO (low battery output) to pull SHDN (shutdown) low and consequently disable the chip. LBI then senses a rising input voltage, LBO goes high and the pulsating control maintains maximum power transfer to the NiCd cells.

Current limiting inside the MAX639 creates a ‘ceiling’ of 200 mA for I out. Up to five NiCd cells may be connected in series to the charger output. When ‘on’ the regulator chip passes current from pin 6 to pin 5 through an internal switch representing a resistance of less than 1 ohm. Benefiting from the regulator’s low quiescent current (10 microamps typical) and high efficiency (85 %), the circuit can deliver four times more power than the single-diode configuration usually found in simple solar chargers. Coil L1 is a 100-µH suppressor choke rated for 600mA.

Author: D. Prabakaran - Copyright: Elektor July-August 2004

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