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Control Circuits  Page 2
Control Circuits: 
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Last Updated on: Monday, October 03, 2011 06:07 PM



Circuits Designed by Dave Johnson, P.E. :
  • DC Motor Brake
    When the power switch is closed, the gate voltage of Q1 turns Q1 on.  The drain of Q1 swings low, turning off Q2. Current flows freely into the DC motor with only one diode drop from D2.  When the power switch is open.  The gate voltage of Q1 swings low, causing the drain of Q1 to swing high. This turns on the transistor Q2.  With Q2 on, the resistor R3 is switched in parallel with the motor, producing a braking action. 
    The value of R3 can be selected for the desired braking action.  A zero ohm resistance will produce the fastest slow down of the motor.  The circuit below is good for about 500ma of motor current.  A Q2 transistor with a lower on resistance would be needed for bigger motors.  Also, D2 would need to increase in size
 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Dark-Activated 230V Lamp -  Compact circuitry using small-size parts only.  Can be wired in parallel to existing switches. (added 6/06)
DC Motor Brake -  When the power switch is closed, the gate voltage of Q1 turns Q1 on.  The drain of Q1 swings low, turning off Q2. Current flows freely into the DC motor…. [Designed by David A. Johnson]
DC Motor Control Circuit -  This circuit uses solid state switching (transistors) to control direction of a DC motor. You have precise control of the movement of the motor, and an indication of direction provided by LED's….(circuit / schematic design added 6/06)
DC Motor Control using a Single Switch -  (electronic Circuit / Schematic added 10/04)
DC Motor Controller (jcmiras.net) -  This DC Motor Controller circuit will control a 12V dc motor. The system will have three pushbuttons: a START button, a REVERSE button and a STOP button. Initially, the motor must not be running. When the START button is pressed, the motor will run in one direction. (added 6/06)
DC Motor Driver with L6203 -  The L6203 is a DMOS full bridge driver, which can handle the high peak current up to 5A and supply voltage up to 48V with RDS (ON) of just 0.3 ohm. The chip can run the motor at 4A continuous with proper heat sinking…..(electronic circuit added 4/05)
DC Motor Model -  Although SPICE does not provide explicit models for electro-mechanical devices, like a DC motor, creating one is fairly straightforward. You just need to remember that most physical behaviors, whether mechanical or electrical, can be described by a set of equations. So for a desired....(spice design added 02/09)
DC Motor Pulse Width Modulation Speed Control -  This is a circuit for controlling the speed of small DC motors, it works nicely as a speed controller for an HO or N gauge model railroad. (electronic diagram added 10/06)
DC Motor Reversing Circuit (Christian Sanchez) -  A DC motor reversing circuit using non latching push button switches. Relays control forward, stop and reverse action, and the motor cannot be switched from forward to reverse unless the stop switch is pressed first. (added 4/02)
DC Motor speed Controller -  Scroll down to find link to circuit drawing and circuit explanation….(electronic schematic added 09/06)
DC Motor-Driver H-Bridge Circuit -  Physical motion of some form helps differentiate a robot from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can't pass enough current or voltage to spin a motor. Also, motors tend to be electrically noisy (spikes) and can slam power back.... [David Cook]
DC Motor-Driver H-Bridge Circuit circuitdb -  Physical motion of some form helps differentiate a.... (added 2/07)t from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can't pass....
DC Push Button Motor Control -  This circuit uses solid state switching (transistors) to control direction of a DC motor. You have precise control of the movement of the motor, and an indication of direction provided by LED's…. [Andy Collison]
DC servo Motor driver -  site is currently under construction [Site is under construction right now]
DC Servomotor Controller -  An experiment on the DC servomotor control system. It is controlled with only an AVR.  (added 6/06)
DC/DC Converter operates from Phone Line -  15-Jan-98 Issue of EDN DC/DC converters for use inside the telephone handset require operation from the high-source-impedance phone line. Additionally, the CCITT specifications call for maximum on-hook power consumption of 25 mA. The dc/dc converter in Figure 1 is 70%-efficient at an input power of 25 mA, providing 5V at 3.4 mA. Controlled, low-peak switch.... [Design Idea by Gary Shockey, Linear Technology Corp, Milpitas, CA]
Debugging an MCU-based CCD camera Controller -  Agilent Application Note  (app note added 6/06)
Decoding Infrared Remote Controls -  The origin of this posting was the question what to do with an old TV. I suggested to use the infrared remote control as an input keyboard for a microcontroller board and mentioned a piece of code I had written for the 8052 microcontroller. I was asked by some people to share my information about remote controls... [from Juergen Putzger]
Delayed shutter control for Kodak DC-20 -  (circuit added 1/07)
Desktop Power Supply -  (application / block diagram added 6/07)
Desktop Power Supply Clone Market -  (application / block diagram added 6/07)
Device Control using DTMF -  Controlling devices using switches are common. From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches are becoming popular. But these technologies have their own limitations. Laser beams are harmful to mankind. ….(Circuit design added 11/08)

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