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This throttle circuit for medium power motors uses a voltage regulator I.C. to control the motor speed.
The regulated voltage is amplified by the driver 2N3055 transistor and fed to the track. It should be mounted on a heat sink as it drops considerable power at slow speed.
The I.C. output voltage is set by the speed control potentiometer and modified a little by the track voltage. So when the track load increases and the voltage drops then a compensation is fed to the I.C. The rectifier should have a 4 amp rating.
---- Running report
Starts at a good low speed and has smooth accelleration. There is some oscillation as feedback kicks in with some motors - an LC filter in the output will correct this. Control dead band a little high.
This throttle circuit for medium power motors uses a voltage regulator I.C. to control the motor speed.
The regulated voltage is amplified by the driver 2N3055 transistor and fed to the track. It should be mounted on a heat sink as it drops considerable power at slow speed.
The I.C. output voltage is set by the speed control potentiometer and modified a little by the track voltage. So when the track load increases and the voltage drops then a compensation is fed to the I.C. The rectifier should have a 4 amp rating.
---- Running report
Starts at a good low speed and has smooth accelleration. There is some oscillation as feedback kicks in with some motors - an LC filter in the output will correct this. Control dead band a little high.
LINK TO IMAGE - cab-reg.gif
Circuit Schematic
