Hi everyone,
I am an ageing astronomer and in NO WAY not an electronics engineer, but I have an electronic problem.
I am using a commercially supplied Celestron 9v DC motor and high reduction gearbox system which gives a speed at the output shaft of 1 rev per 11 mins, with good high torque.
The motor is described by Celestron as quartz controlled, the speed control is very accurate, adjusted by a small rotary spindle ( potentiometer thing ?), mounted on a board with a bunch of other resistors and stuff and what looks like a square black bug with 8 legs (!!)
BUT the output runs just too fast for my application. At the slowest end of the spindle setting it is still about 10% too fast for my needs.
Is there a simple way to reduce the speed output, by say adding another resistor to the control circuit perhaps ?
Gears etc are too clumsy and I am Sooo ... close to getting the speed I need from this great little unit.
Any suggestions would be very gratefully recieved.
thanks in advance for yout time
davidB
I am an ageing astronomer and in NO WAY not an electronics engineer, but I have an electronic problem.
I am using a commercially supplied Celestron 9v DC motor and high reduction gearbox system which gives a speed at the output shaft of 1 rev per 11 mins, with good high torque.
The motor is described by Celestron as quartz controlled, the speed control is very accurate, adjusted by a small rotary spindle ( potentiometer thing ?), mounted on a board with a bunch of other resistors and stuff and what looks like a square black bug with 8 legs (!!)
BUT the output runs just too fast for my application. At the slowest end of the spindle setting it is still about 10% too fast for my needs.
Is there a simple way to reduce the speed output, by say adding another resistor to the control circuit perhaps ?
Gears etc are too clumsy and I am Sooo ... close to getting the speed I need from this great little unit.
Any suggestions would be very gratefully recieved.
thanks in advance for yout time
davidB