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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

Master Category List - Dave's Circuits

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Motor Control Circuits Circuits

12v Brush Motor Speed Controller  -  In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed.  In other applications, the average current to the motor needs to be limited, so the . . . [Hobby Circuit designed by Dave Johnson P.E.,  05/05/07]


12v Cooling Fan Thermostat  -  This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . [Circuit by David Johnson P.E.,  02/06/11]

 

12v DC Motor with Logic Controlled Automatic Brake  -  There are times when you would like to control a DC motor using a simple +5v logic swing signal.  The circuit below performs this feat and also includes an automatic motor braking circuit.  When the input logic signal swings from 0v to +5v, the n-channel . . . [Hobby Circuit designed by David Johnson P.E.,  02/18/10]

 2 Pushbutton 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 . . . [Hobby Circuit designed by David Johnson P.E.,  09/11/05]


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 . . . [Circuit by David Johnson P.E.,  02/01/07]


Alternating CW & CCW Motor Driver  -  A while back a company needed a motor controller for a custom door latching system.  The system used a small brush motor with a speed reduction gear to both latch and unlatch the door.  When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door . . . [Circuit by David A. Johnson P.E.,  09/05/10]


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 . . . [Hobby Circuit designed by David Johnson P.E.,  09/25/04]


Brush Motor Speed 12V Controller  -  In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed.  In other applications, the average current to the motor needs to be limited, so the . . . [Circuit by Dave Johnson P.E.,  05/05/07]


Classic Linear 5v Supply Using 6.3VAC Transformer  -  There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v. This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion. PWM signals are often . . . [Hobby Circuit designed by David A. Johnson P.E.,  10/31/10]


Computer Controlled PWM Circuit  -  There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v. This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion. PWM signals are often . . . [Circuit by David A. Johnson P.E.,  10/31/10]


Cooling Fan Thermostat (12v)  -  This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . [Hobby Circuit designed by David Johnson P.E.,  02/06/11]


CW & CCW Alternating Motor Driver  -  A while back a company needed a motor controller for a custom door latching system.  The system used a small brush motor with a speed reduction gear to both latch and unlatch the door.  When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door . . . [Hobby Circuit designed by David A. Johnson P.E.,  09/05/10]


H Bridge Motor Controller uses Low Power  -  This circuit uses a few logic gates & a 74AC240 to control power to a small gear motor . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/03/05]


Logic Controlled 12v DC Motor With Automatic Brake  -  There are times when you would like to control a DC motor using a simple +5v logic swing signal.  The circuit below performs this feat and also includes an automatic motor braking circuit.  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 . . . [Circuit by Dave Johnson P.E.,  02/18/10]


Low Power H Bridge Motor Controller  -  This circuit uses a few logic gates & a 74AC240 to control power to a small gear motor . . . [Circuit by Dave Johnson P.E.,  07/03/05]


Low Voltage Latch Circuit  -  A Discover Circuits visitor wanted a simple on/off latch circuit which can turn on and off power to a small motor.  The kicker was that he wanted to power the circuit and the motor from a single 1.2v NiMH battery cell.  Texas Instruments comes to the rescue with their family of low voltage single gate ICs.  Specifically the SN74AUP1Q14 Schmitt trigger inverter will operate down to 0.8v and lower.  When used with a good NPN transistor, the circuit below works quite nicely . . . [Circuit by Dave Johnson P.E.,  03/01/13]


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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/16/07]


PWM Motor Controller uses a 555 Timer  -  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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/01/07]


Rapidly Stops DC Motor Drive   -  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 . . . [Circuit by Dave Johnson P.E.,  09/25/04]


Solar-Powered Pump Motor Controller  -  A Discover Circuits visitor had a problem.  He needed a simple on/off controller for his solar powered water pump.  His system used two 12v 50 watt solar panels wired in series.  The power from the solar panels drove a submerged water pump.  However, during . . . [Circuit by David Johnson P.E.,  10/03/10]


Thermostat for 12v Cooling Fan  -  This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/06/11]


Two Pushbutton 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 . . . [Circuit by David Johnson P.E.,  09/11/05]


Water Pump controlled by Solar Power  -  A Discover Circuits visitor had a problem.  He needed a simple on/off controller for his solar powered water pump.  His system used two 12v 50 watt solar panels wired in series.  The power from the solar panels drove a submerged water pump.  However, during . . . [Hobby Circuit designed by David Johnson P.E.,  10/03/10]


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