Motor Reversible

This circuit operates a small direct current motor in both directions, useful for those who like robotics. The heart of this circuit is the popular 741, with a symmetrical source, which can be 6, 9 or 12 volts (See sources), depending on food, so must be the motor voltage. The circito consists of an adjustable gain (R9), this makes it useful for many applications, for example, laboratory pumps, robotics, to control fans and small models of radio control.

OPERATION: The entrance is not investing (pin 3) 741 is polarized with voltage reference 0 volts from the source symmetrical. This means that if the voltage at the input investment (pin 2) is greater than the reference voltage, the amplifier starts its role in providing its output (pin 6) an amplified voltage less than 0 V. The amplification factor is determined by the mains, which is formed with R4 and R9.

When the voltage is less than 0 V. The Q2 results and the motor is powered by the battery B2, this produces a shift in a certain direction. If the voltage is applied to entry and investment is less than 0 V. and amplified in a dependent relationship R9. Under these conditions, lead Q1 and the engine will be encouraged by the battery B1, as shown in the diagram, the polarity is contrary to B1 from B2, turning the motor in the other direction. R8 serves to reduce the voltage at the gate no investment, between a value lower than the reference voltage and a higher value, to cover this with a broad range of the band rotations.

This means that we can make the motor turn at various speeds.

List of components
Transistors:
IC1: 741
Q1: BD135
Q2: BD136
Resistors:
R1, R6, R7: 1K Ω
R2: 4.7K Ω
R3, R4, R5: 10K Ω
R8: 10K Ω (potentiometer)
A9: 100K Ω (potentiometer)
M1: Small Engine CD (voltage as food)
B1, B2: Power of 6, 9 or 12 volts.

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