LB1948M bassed forward reverse motor control driver circuit with explanation

A very simple forward reverse motor control driver electronic circuit project can be designed using the LB1948M 2 channel low saturation voltage forward reverse motor control driver IC. LB1948M motor driver is optimal for motor drive in 12V system products and can drive either two DC motors, one DC motor using parallel connection, or a 2-phase bipolar stepping motor with 1-2 phase excitation mode drive.
Some features of the LB1948M motor driver IC are : 12V power supply ,low saturation voltage: VO(sat) = 0.5V (typical) at IO = 400mA ,zero current drawn in standby mode , braking function ,built-in thermal shutdown circuit .

The LB1948M can be used as a single-channel H-bridge power supply by connecting IN1 to IN3, IN2 to IN4, OUT1 to OUT3, and OUT2 to OUT4 as shown in the figure. (IOmax=1.6A, VO(sat)=0.6V (typical) at IO=800mA) .
The circuit is very simple and require few external electronic parts .

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DC Motor Speed Controller

This circuit takes advantage of the voltage drop across bridge rectifier diodes to produce a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as efficient as a switch-mode circuit but it has the virtues of simplicity and no switching hash. The four full-wave bridges are connected so that each has two pairs of series diodes in parallel, giving a voltage drop of about 1.4V, depending on the load current.Circuit diagram:

DC Motor Speed Controller Circuit Diagram

The rotary switch should have "make before break" contacts which should be rated to take currents up to about an amp or so. For higher currents, higher rated bridge rectifiers and a suitably rugged rotary switch (or solenoids) will be required. If you want smaller voltage steps, you could use the commoned AC inputs on the bridge rectifiers to give intermediate steps on the speed switch.
Author: Stephen Butcher

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Motor Bike Headlight Controller

This circuit automatically turns a motor cycles headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage uses the 22O resistor and ZD1 to hold transistor Q1 off while the motor is not running; it draws about 2mA. Once the battery voltage exceeds 7.0V during charging, Q1 begins to turn on. 

 
The last stage uses the 22O resistor and ZD2 to turn on transistor Q2, which pulls the base of Q1 down, switching it hard on. In conjunction with the Vbe drop of Q2, ZD2 will turn off Q2 at a battery voltage of about 6.7V. In practice, this means that the headlight will be on most of the time while the motor is running and charging the battery. Heatsinks are required for both transistors. The circuit can be mounted adjacent to the battery with a single lead going to the headlight power feed.

Motor Bike Headlight Controller Circuit Diagram:

Parts	Description
P1	5R - 3W
R1	220R -1W
R2	1R - 1W
R3	22R - 5W
R4	22R - 5W
Q1	BD139
Q2	MJ4502
D1	6.2V - 1WZener
D2	6.2V - 1WZener
B1	6.6V - 7.2V
F1	Fuse 15A
Lp1	DIP Beam 6V-25W Halogen

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Electric Motor Repair

Electrical engines are a significant aspect of most large functions. They are used to make current that can be linked with a strength or to immediately petrol other systems. These engines are complicated items of professional systems and consequently it is not recommended for a individual who is not a certified fix individual to attempt to fix them. This transforms digital strength into technical strength.

They come in a wide range of types and the type that you use will depend on what you need it for. The primary parts are the blades and the stator. The blades is the going aspect and the stator is the invitations aspect of it. These two items make the time frame for it.

Most engines are attractive in characteristics. Both the blades and the stator generate a attractive area which makes a twisting, or demand on the powerplant base and makes the revolving of the powerplant. This is how it functions.

Finding a reliable serviceman for your powerplant can be a complicated procedure. The crucial aspect is making sure that the serviceman you seek the services of is certified in mending. An search can help you discover certified serviceman in your community that can fulfill your immediate and continuing needs.

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The fix is the first step in a long procedure of its servicing. Once it has been fixed, youre going to want to set up a frequent servicing routine in order to reduce the cost and agony of upcoming fixes. Maintenance is the single greatest factor you can do to reduce the need for fixes.

The best factor you can do with regards to fix is to put the extra persistence in to make sure that frequent servicing is being done. Effectively managed engines need less fix and cause less problems for you. If you can keep your engines properly managed youre less likely to need comprehensive and expensive fixes.

Electric powerplant fix can take many types, based on what type of powerplant unit you have and the characteristics of its use in your business. The best factor you can do with your damaged powerplant unit is to discover and seek the services of a reliable serviceman to do the fixes. Electrical powerplant fix can be reduced by exercising servicing on your powerplant unit.

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