Voltase hobby: dc

Showing posts with label dc. Show all posts

Wednesday, November 12, 2014

NJU7365 bassed DC brushless motor driver circuit with explanation

A very simple single phase dc brushless motor driver electronic circuit project can be designed using NJU7365 DC brushless motor driver ic manufactured by New Japan radio Co. LTD .

The NJU7365 is a single phase motor driver ic that include in package MOS FET motor driver , direct PWM input , FG output and thermal shut down circuit . The driver is capable of 1000mA maximum output current and continuous current of 350 mA . This motor driver require few external electronic parts and can be powered from dc power supply from 2 to 5.5 volts .

Friday, October 17, 2014

6 to 15V DC to DC Converter

A very efficient 6V to 15V DC to DC converter using LM2585 is shown here. LM2585 is a monolithic integrated voltage converter IC that can be used in various applications like flyback converters, boost converters, forward converters, multiple output converters etc. The circuit requires minimum number of external components and the IC can source up to 3A output current.

6 to 15V DC to DC Converter Circuit diagram :

6 to 15V DC to DC Converter Circuit Diagram

Here the IC is wired as a boost converter where resistors R1 and R2 are used to set the output voltage .The junction of R1 and R2 is connected to the feedback pin of IC1. Capacitor C4 is the input filter while capacitor C1 the filter for output. Network comprising of resistor R1 and capacitor C2 is meant for frequency compensation. Inductor L1 stores the energy for acquiring boost conversion.

Notes:

Assemble the circuit on a good quality PCB.
LM2585 requires a heatsink.
Output voltage is according to the equation Vout =( (R1/R2)+1) x 1.23.
Capacitors other than C4 and C1 are ceramic capacitors.
Maximum output current LM2585 can source is 3A.

Monday, September 8, 2014

Antique Radio Dc Filament Supply Wiring diagram Schematic

This dc supply is great for operating battery-powered antique radios, because it is designed to prevent harming the tube filaments. The schema is useful for powering filaments of 00-A, 01-A, 112A, and 71A tubes, which require 5V at 250 mA.

Antique Radio Dc Filament Supply Circuit Diagram

Thursday, September 4, 2014

3 φ Full Wave Controlled Rectifier circuit to control DC Motor Speed

In the given Block and schema diagram of a 3 φ Full Wave Controlled Rectifier schema to control DC shunt motor is shown.

In this schema diagram the field and armature diagram are connected through three phase full wave Controlled rectifier schema.

In three phase supply, each phase is different form other one in 120°, therefore at each out put terminal a, b, & c give the following Sine wave voltage.

Through the three phase controlled rectifier, the three phase supply is converted to a DC and provided to the armature and field of the DC shunt motor.

Through the 3φ full wave Controlled Rectifier, the 3φ AC supply converted to a DC voltage and provide to the armature and field of the DC motor, which flow in shape of T_A (Armature Current) through the ckt (DC motor) due to this controlled Dc the motor start in low speed.

If the DC motor start through ordinary way, then an external resistance is connected in the armature ckt, these resistors in armature ckt controlled the speed of the motor, (Gradually decreases the resistance form the armature ckt) and when total resistance (Resistors) remove form the armature ckt, the motor is rotate at its full speed (RPM). The main purpose of the resistance with the armature ckt is that, to match armature current with internal current (emf) to decreased value.

In case of the controlled rectifiers the resistors are not connected because at motor starting time the SCR connected in armature ckt set the delay angle value ,that the armature resistance controlled the voltage drop in the armature. The armature controlled method is mostly used as compare to the field controlled method,

In armature controlled method the field voltage is kept constant, while the armatures voltages changes.

In the given ckt rectifier converted to the in put DC supply (Full wave) , the rectifier is consistof SCRs , the out put of the SCR is Directly apply to the Armature in a variable shape. The applied voltage can be change form the changing the firing angle of the SCR.

Sunday, August 31, 2014

12 Volt to 32 Volt CT converter DC to DC

Kit that can change the normal 12v dc voltage from a car battery, battery bike 12V motor. With the current 7A. so this circuit is very suitable for power car amplifiers and sound systems that use simple 12V battery.

Thursday, August 28, 2014

Universal Laptop Power Supply AC DC Adapter

One of the things you may not think about when buying a new laptop is what will happen if you lose your laptop AC adapters. Sure this does not seem like something you would lose, but it is very easy to misplace. So it is always a good idea to know where to buy another one, or even have another one handy just in case something like this should ever happen.

If you are going to buy laptop AC adapters online you need to make sure it is the right one. The one that comes with the computer is, of course, the best one to have for it, however, if you buy one online just make sure it is going to fit your computer.

Also, be sure that it is a good model of laptop AC adapters. Some of them can get too hot and overheat. The best thing to do is read some online reviews of the notebook battery chargers, and see which ones work the best. From there you can choose the one that you are going to need. I think it is always a good idea to have a back up anyway. Nothing is worse than having a laptop and not being able to use it. So do not let that happen to you. Go out and get an extra one today.

Replacing notebook power supplies is sometimes an expensive process as it the purchase of an air/auto power supply for your laptop. However for those users who need a new power supply for their notebooks or for users planning to travel, Targus have available a Universal adapter series called the Universal 70 Watt AC/DC Power Adapter that gives the user a variety of ways to power their notebooks.

Features

Power on the go, anywhere: Works at home, office, car, boat, or aeroplane.
Lightweight design: At just 213g, this adaptor is lightweight, compact and ideal for travel.
Compatible with other mobile devices: With the optional Targus Accessory Powering System and device tips, you can power your mobile phone or PDA as well as your notebook.

Basically the Universal 70 Watt AC/DC Power Adapter allows you to plug your laptop into a car cigarette lighter, an aero plane power seat system or into the mains to give your notebook the electricity needed to run the unit. Best of all, the device is 98% compatible with popular 70W notebooks and covers a whopping 6,300 models.Visit Tagus Website

Technical Specifications

Compatibility: Airline Compatibility Chart Always call your airline to confirm inflight power seat system and Targus auto/air compatibility.
Varied models of Acer, Apple, Compaq/HP, Dell, Fujitsu, IBM, Panasonic, Sony and Toshiba.
Other: Includes9 tips 91cm AC input cord 91cm DC input cord 1.82m DC output cord User guide.
Size: 13.7 x 5.5 x 2.2 cm.
Technical: 100-230 VAC 11.75-16.00 VDC.
Warranty: Limited Two Year Warranty.
Weight: 213g

Targus Universal 70 Watt AC/DC Power Adapter is a must have device for those notebook users who travel or even for users that need a second power supply for their PC. The unit is relatively quite small and does not weigh much which is perfect for users on the go.