Difference between revisions of "POT4b"
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* added circuit to make REF- and REF+ approximately symmetrical about COM | * added circuit to make REF- and REF+ approximately symmetrical about COM | ||
* OPAMP drives REF- and REF+ is a precise voltage above REF- | * OPAMP drives REF- and REF+ is a precise voltage above REF- | ||
+ | * instrumentation amplifier is INA122 - which has a gain*freq product of about 200KHz. | ||
+ | == gain and filter variation == | ||
+ | * initial gain 502, amp cut-off 400Hz, LP2 cut-off freq of 1.6KHz, amplifier cut-off = | ||
+ | |||
+ | * B1 gain 502, amp cut-off 400 Hz, LP2 cut-off = 497 Hz | ||
+ | * B2 gain 980, amp cut-off 204 Hz, LP2 cut-off = 497 Hz | ||
+ | * B4 gain 4005, amp cut-off 50 Hz, LP2 cut-off = 497 Hz | ||
==[[pot4 power supply | POT4 Power Supply]]== | ==[[pot4 power supply | POT4 Power Supply]]== |
Revision as of 03:41, 23 July 2006
Contents
revisions from POT4a
- changed reference from TL1431 to fixed voltage MAX1631
- added circuit to make REF- and REF+ approximately symmetrical about COM
- OPAMP drives REF- and REF+ is a precise voltage above REF-
- instrumentation amplifier is INA122 - which has a gain*freq product of about 200KHz.
gain and filter variation
- initial gain 502, amp cut-off 400Hz, LP2 cut-off freq of 1.6KHz, amplifier cut-off =
- B1 gain 502, amp cut-off 400 Hz, LP2 cut-off = 497 Hz
- B2 gain 980, amp cut-off 204 Hz, LP2 cut-off = 497 Hz
- B4 gain 4005, amp cut-off 50 Hz, LP2 cut-off = 497 Hz
POT4 Power Supply
Identification
- POT4b is a green PCB with white silk screen on two sides.
- Dimensions 1.75" x 0.85"
- Two mounting holes (diameter = 0.125"), top side clearance > 0.25"
- The color of DL1,DL2 indicates the input configuration of the board
Led Indicators
- (DL1, DL2) : A pair of single LEDs indicate the present of power. These LEDs are aligned with the power input to the boards.
- DK1 : The intensity of this dual RED/GREEN LED indicates the voltage of the "position signal".
board status / history
- 4-5-06 : B5 when powered by CEB and Greddy smokes RN1 and associated PCB trace. Replaced and controlled power to board to discover that UA1 gets hot. Most likly power was applied to the input side of the board and destroyed the device.
- 3-15-05 : B3 has power application problem.
Design Files
- Media:Pot4b-sch-revb-062205.pdf
- Media:Rpot4b-pcb-top-revb-061605.pdf
- Media:Rpot4b-pcb-bot-revb-061605.pdf
- Gerber files and Tango DOS source (6-16-05)