- Joined Apr 3, 2018
As I am novice to electronics I took on a project with a model monorail . It has a 20 volt li-ion battery to run a 24vdc brushless motor. It runs on a track that has charge buss at each end . Sensors see the train before entering the charge buss and engage a timer relay to turn it on for X seconds. The charge charges the battery and shuts the motor of because it runs on an H-bridge that has 5 vdc enable and left and right pwm terminals . The lpwm and rpwm are just recieving a 5 volt hi or low to reverse polarity when the charge buss turns off enable goes hi and the train takes off in the opposite direction. A cd4027 toggle Q and Q not to left or right pwm term on the H-bridge. The 4027 is clocked with a 74hc74 all running on 5 volts from a lm317 regulator.However , it is not consistent and not sure why. It works perfectly on the breadboard so I etched my own card using Ki Cad and it works fine in the shop. Why would the 4027 not be consistent ? Im at a loss. I also have a battery cut off circuit so that if the battery goes below 12 volts it shuts the whole thing down.
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