What Must todo

As we presented in another article the A3952S integrated circuit ( designed by Allegro MicroSystems ) can be used to design very simple and useful motor driver circuits . In the precedent article was presented a simple bipolar stepper motor driver circuit that use two A3952S circuits. As we presented in that article , the A3952S is capable of continuous output currents up to 2 A and operating voltages range up to 50 V.

DC Servo Motor Controller Circuit diagram

Warning , the 50 operating voltage is to power the motor , for the logic controller you will need a 5 volts Dc power supply .

This circuit presents a simple DC servo motor application that can be used in various electronic projects . As you can see in the circuit schematic this Dc servo motor driver schematic circuit use just one integrated circuit and other few external electronic components . With bidirectional dc servo motors, the PHASE terminal can be used for mechanical direction control. Similar to when braking the motor dynamically, abrupt changes in the direction of a rotating motor produce a current generated by the back EMF. The current generated will depend on the mode of operation.

This simple circuit is a DC-DC converter that converting up 12V source to a 24V. It can be used to run radios, small lights, relays, horns and other 24V accessories from a 12V vehicle with a maximum draw of about 800mA.

This DC-DC Converter can be used to charge one 12V battery from another, or step up the voltage just enough to provide necessary overhead for a 12V linear regulator. Using one op-amp as a squarewave oscillator to ring an inductor and another op-amp in a feedback loop, it wont drift around under varying loads, providing a stable 24V source for many applications. With a wide adjustment in output this circuit has many uses. 

Parts List

R1-R4,R7-R8 100K 1/4W Resistor 

R5 470 Ohm 1/2W Resistor 

R6 10K Linear Pot 

C1 0.01uF Mylar Capacitor 

C2 0.1uF Ceramic Disc Capacitor 

C3 470uF 63V Electrolytic Capacitor 

D1 1N4004 Rectifier Diode 

D2 BY229-400 Fast Recovery Diode See Notes

Q1 BC337 NPN Power Transistor 

U1 LM358 Dual Op Amp IC 

L1 See Notes 

MISC Board, Wire, Socket For U1, Case, Knob For R6, Heatsink for Q1

DC- DC Converter Notes 

1. R6 sets the output voltage. This can be calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A). 

2. L1 is made by winding 60 turns of 0.63MM magnet wire on a toroidial core measuring 15MM (OD) by 8MM (ID) by 6MM (H). 

3. D2 can be any fast recovery diode rated at greater then 100V at 5A. It is very important that the diode be fast recovery and not a standard rectifier. 4. Q1 will need a heatsink.

This DC motor controller circuit shown in this schematic use the L620x motor driver . The L620x is a monolithic full bridge switching motor driver realized in the new Multipower-BCD technology which allows the integration of multiple, isolated DMOS power transistors plus mixed CMOS/bipolar control circuits and is available in many versions : L6201 /1PS/2/3 .

L6203 DC Motor Controller Schematic

All this motor driver circuits are identically , the differences between them is the total RMS current , which is up to : 1A for L6201 , 2A for L6202 and 4A for L6203 and L6201PS . If the device is combined with a current regulator like the L6506 , can be implemented a transconductance amplifier for speed control, as shown in this circuit schematic . In this configuration only half of the L6506 is used and the other half of the device may be used to control a second motor.

The L6506 senses the voltage across the sense resistor RS to monitor the motor current: it compares the sensed voltage both to control the speed and during the brake of the motor. A snubber network made by the series of R and C must be foreseen very near to the output pins of the I.C.

The following formulas can be used to calculate the snubber values:
R @ VS/lp ; C = lp/(dV/dt) where:
VS is the maximum Supply Voltage foreseen on the application; Ip is the peak of the load current; dv/dt is the limited rise time of the output voltage (200V/ms is generally used).
of the IC. Sometimes a capacitor at pin 17 of the L6506 let the application better work.

Making a DC motor driver with H-Bridge technique can use IC L293D as in the article "DC Motor Driver H-Bridge L293 (2 Motor DC)"is. DC motor driver L293D can be used to control the DC motor 2 pieces at once. DC Motor Driver L293D can be used to control a DC motor continuously or with a PWM technique. Dc motor driver circuit in the article "DC Motor Driver H-Bridge L293 (2 Motor DC)" only use IC L293D only. For more details see the following figure.

Working system of DC motor driver L293D is to provide control signals in the form of logic or pulse to the input lines 1A - 1B for DC motor control M1 and the input 2A - 2B for the control of DC motor M2 with the following conditions:

This circuit is called DC TO DC converter circuit.Which increase the voltage circuit.There can be customized to change the output values. When the power supply input to IC1 is the output pin 3 at a frequency of 1 kHz.The frequency is Q1 and Q2, which will continue to use push pool work interchangeably.If this is the positive output signal Q1 Q2 will run the delete function this reason, C2 and C3 capacitors are half-wave alternating.When to use. Voltage from C2 to C3 is discharged out to the input voltage over almost two times less than 2 times due to the loss of diodes D1-D3.

Using a simple operational amplifier and some other common electronic components can be designed a very simple DC motor driver that can be used for a 200mA motor application . Rb sets the bias point for transistors Q1 and Q2.
Because Vbe(ON) varies greatly with temperature, a guardband is required to prevent Q1 and Q2 from conducting simultaneously. RB should be selected such that the transistors do not conduct until lM equals the op amp quiescent supply current, Isy . The transistors will begin to conduct at about Vbe (on) = 0.5V. In this project :
RB= [vbe(on)/(lSY+ Im)]= 0.5/(0.0025 + 0.0025)=100 ohms

To maximize voltage swing across the motor, V1 must be minimized. If at full load V1 = 0.2V with V+ = 15V and VBE1 = 0.8V, the voltage across the motor will be:
VM = (V+ - 2) - VBE1 - V1 = (15 - 2) - 0.8 - 0.2 = 12.0V Vin may be scaled with a resistive divider as:
VIN= (R1 + R2)/R2 With R1 = 240k and R2 = 10k, VIN =5 volt lM = 200mA.

Power supply circuit to generate output below were variations between 1.3V DC to 12.2V DC with 1A current.
In addition, the power supply circuit is also equipped with over-current protection or shield against belebih flow. Power supply circuit is very simple, but the quality is quite good, made her basiskan regulator IC LM723 is a pretty legendary.

source [link] 

This DC to AC inverter circuit work based on unstable multi vibrator does. In this circuit, IC CD4047 is chosen as a heart of unstable multivibrator, because this IC type gives a complementary output that has opposite phase to another ( pin 10 and 11 as seen in Figure 1), and has 50 % duty cycle that satisfy to generate a pulse for inverter.

DC to AC Inverter with IC CD4047 Circuit Diagram

Using the TDA7275A linear integrated circuit manufactured in a minidip plastic package can be designed a very simple speed regulator electronic project that can be used for speed regulation of small DC motors .

TDA7275A DC speed controller project is intended for use as speed regulator for DC motors of record players, tape and cassette recorders. This DC motor speed controller circuit project can provide a maximum output current of 1.5 amperes .

This circuit can be powered with a voltage range between 8 and 18 volts . V2 is typically 1.5 volt for Motor ”Run” (Acc. Following data or open) and 1 volt for Motor ”Stop” (Acc. Following data or grounded) .