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Control Circuits
Designed by David A. Johnson, P.E.

Last Updated on:
Tuesday, October 13, 2009 01:26 PM


Master Category List - Dave's Circuits

 

  • 9v POWERED XENON PHOTOFLASH Controller
    This 9v battery powered circuit is designed for remote control flash needs. A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged. A neon lamp is included to indicate when the system is ready to flash.

 
  •  555 Timer Forms Simple PWM Motor Controller
    Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor.  (added 7/06)
  • Automatic DC Motor Brake
    In many DC motor powered systems you would like the motor to quickly come to a full stop.  This circuit provides an automatic electronic braking action to any DC motor ranging from 6v to 24v up to 1 amp of current.  Some of the component values could be changed for larger motors....
  • 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.... 
  • Low Voltage H-bridge
    TTL type Q and inverted Q inputs control a classic H-bridge circuit, rated at 50 volts and about 10 amps.  The circuit can control power and direction of a DC motor.  (added 7/06)
  • Motor Brake
    This circuit will bring a fast moving DC motor to a stop in seconds.  The braking action is automatically applied whenever DC power is removed.

  • PWM Circuit for Motor Speed Control
    Sometimes you want to slow down a brush type DC motor. The most efficient way to do this is with a pulse width modulation (PWM) technique. The hobby circuit below can operate from about 3 volts to 15 volts. The frequency is fixed at about 2KHz but the pulse width can be varied from nearly 100% to 0%. ...
  • Two Button Motor Controller
    Two small pushbutton switches, a few diodes and two relays form a method to control on/off power to a brush motor as well as the motor direction.  The circuit was originally designed for a motorized lifting platform.


More Control Circuits

Master Category List - Dave's Circuits
 

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