Hello, this is my first post on the forum. Sorry it's so long!
I need some help to better understand the circuit shown below. This circuit shown is only a portion of the entire schematic for the device.
**broken link removed**
This circuit drives a gimble mounted rotor (Gyroscope) in a coil wrapped cylindrical housing via an optical sensor located on the PCB attached to the open end of the housing. (See photo below)
**broken link removed**
I'm pretty sure the optical sensor is depicted by the "curved double-headed arrow" in the upper left of the schematic. If I am correct, the sensor is essentially a switch that opens and closes as it "sees" the "dark and light" hemispheres of the rotor going by. Does this make sense? If so, can anyone explain the current path through the circuit as the "switch" opens and closes?
Also... Is the coil simply turned on and off or does the circuit actually reverse the bias of the coil as the "switch" opens and closes? I am puzzled as "physically" there is only one coil with only two leads (see photo) whereas the schematic shows two coils (L1 & L2) with three connections. I'm guessing the real coil is represented in the schematic as L1 & L2 combined; Or, L1 and L2 each represent the same coil in different states. Can anyone clear this up.
Lastly... Currently, when power is applied to the circuit, the rotor starts to turn but only turns one half of a complete revolution and then stops. So whatever is suppossed to change the bias of the coil is not working. I have tested the optical sensor with the PCB disconnected by applying 14V to the input of the board and then, while alternately lighting and shading the sensor, measured the board's output to the coil. In this test, the output to the coil starts at about 6V and drops to zero (or close to zero) as the sensor is lit or shaded. So I am pretty confident the sensor is working as it should. What other components in the circuit shown, if failed, might likely cause this behavior?
Any assistance will be much appreciated.
ZT
I need some help to better understand the circuit shown below. This circuit shown is only a portion of the entire schematic for the device.
**broken link removed**
This circuit drives a gimble mounted rotor (Gyroscope) in a coil wrapped cylindrical housing via an optical sensor located on the PCB attached to the open end of the housing. (See photo below)
**broken link removed**
I'm pretty sure the optical sensor is depicted by the "curved double-headed arrow" in the upper left of the schematic. If I am correct, the sensor is essentially a switch that opens and closes as it "sees" the "dark and light" hemispheres of the rotor going by. Does this make sense? If so, can anyone explain the current path through the circuit as the "switch" opens and closes?
Also... Is the coil simply turned on and off or does the circuit actually reverse the bias of the coil as the "switch" opens and closes? I am puzzled as "physically" there is only one coil with only two leads (see photo) whereas the schematic shows two coils (L1 & L2) with three connections. I'm guessing the real coil is represented in the schematic as L1 & L2 combined; Or, L1 and L2 each represent the same coil in different states. Can anyone clear this up.
Lastly... Currently, when power is applied to the circuit, the rotor starts to turn but only turns one half of a complete revolution and then stops. So whatever is suppossed to change the bias of the coil is not working. I have tested the optical sensor with the PCB disconnected by applying 14V to the input of the board and then, while alternately lighting and shading the sensor, measured the board's output to the coil. In this test, the output to the coil starts at about 6V and drops to zero (or close to zero) as the sensor is lit or shaded. So I am pretty confident the sensor is working as it should. What other components in the circuit shown, if failed, might likely cause this behavior?
Any assistance will be much appreciated.
ZT
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