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Please refer to Controller unit circuit for this discussion. R5 starts charging C2. That causes the output of U1A to switch to 0 volts. R5 begins to discharge C2. R5 begins to charge C2 and the cycle keeps repeating. The oscillator frequency chosen for the train controller is about 50 Hz 20 mS period.
The low frequency was chosen so that the motor armature could turn Project controller, one segment at a time for control at very slow speeds. Train motors generally have a 2 mS to 5 mS time constant and therefore the PWM period must be at least five to ten times as long in order to have good slow speed control.
R6, R7, and R8 form a resistive divider. The U1B- input is connected to the junction of R5 and C2 which ramps up and down between 5 and 10 volts. Whenever the oscillator ramp voltage is lower than the wiper reference voltage, the output of U1B goes high and whenever the oscillator ramp voltage is higher than the wiper reference voltage, the output of U1B is low.
This cannot be done with a timer. The output of U1B is connected to a switch to power the load.
D3 and R11 protect the gate of Q1 from being over-driven with voltage. R12 provides a light resistive load to Q1, while D4 protects Q1 from inductive load, voltage spikes. This provides a slow acceleration or a momentum effect for a model railroad train. That is the time needed to accelerate to full speed or decelerate to a stop.
The above circuit was designed for a two channel, track or train control. However you can expand this circuit to control up to 3 channels. Doing this you will get extra channels in your project. T1 may need more amp ratings to accommodate the multiple tracks and trains.Digital Depth Inc.
is raising funds for ALL Controller | Universal & Fully Customizable on Kickstarter! The world's first universal and fully customizable game controller. how to build a diy model train controller with pwm speed control and multiple channels to control multiple model train.
Model train controller using opamp.
When the Enable button is selected, the button becomes green, and software starts to monitor antenna SWR and power. When the SWR rises above a certain threshold, the application will adjust the antenna as needed, by commanding the attached motor drive to turn the capacitor shaft.
Welcome to the very first update of the Spartan console. On a bimonthly basis we’ll bring you news on the hardware and software that’s running on the Spartan.
The Spartan console is a proposal to bring Sega back into the console market. We have a working prototype and photos/videos will be . These projects were produced in the five weeks of ECE each year. The microcontroller is the Microchip PIC32 series programmed with MPLABX. Before , we .
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