Other Infrared Sensors
FMA Direct CoPilot Sensor Head
Stock FMA Components
The stock FMA resistors R2/R3 and R5/R6 (0603 0.8 Mohm/0603 510 ohm) set the op amp gain to approximately 1600. Since this unit is designed to run on 5V and we are running it on 3.3V, it is advised to change R3 and R6 from 510 ohm to 1K ohm for an approximate gain of approximately 800. Without the change, it is theoretically possible to overdrive the Op Amp in extreme hot regions/seasons.
Another resistor swap option for this board is to replace R2 and R5 with 560 Kohm resistors, generating an output gain of approximately 1100; a gain which is practically identical to that of the Paparazzi board.
a suitable resistor from mouser is here
| R1 | 200 ohm |
| R2 | 0.8 Mohm |
| R3 | 510 ohm |
| R4 | 200 ohm |
| R5 | 0.8 Mohm |
| R6 | 510 ohm |
| R7 | 600 ohm |
| R8 | 600 ohm |
| C1 | 0.026 uF |
| C2 | 0.026 uF |
| C3 | 0.026 uF |
| C4 | 0.026 uF |
| C5 | 0.01 uF |
| C6 | 0.026 uF |
FMA Direct Vertical Sensor
The same operation can be done with the vertical sensor (single axis). The resistor R3 should be changed from a 510 ohm to a 1K ohm.
a suitable resistor from mouser is here