321
edits
Changes
Jump to navigation
Jump to search
Line 8:
Line 8: + + + + + + + +
List of Board Changes (view source)
Revision as of 21:39, 21 September 2012
, 21:39, 21 September 2012no edit summary
*The voltage regulator for AMPREF had the wrong pin out in our drawings. We rotated it so that VCC_VRef moved to where AMPREF was and a wire attaches from AMPREF to where VCC_VRef was.
*The voltage regulator for AMPREF had the wrong pin out in our drawings. We rotated it so that VCC_VRef moved to where AMPREF was and a wire attaches from AMPREF to where VCC_VRef was.
*This board has been populated by SiPMs.
*This board has been populated by SiPMs.
*For channel 8
**The 25 micron SiPM has been changed to a 50 micron SiPM
**C3 has been replaced by a 47nF capacitor from a 10nF. The RC time between C3 and R1 is the source of the low frequency "bump" in the gain.
**R2 has been increased to a 3.3k resistor. This is to lower the gain of the circuit to compensate for the higher gain from the 50 micron SiPM.
**R3 has been increased to a 1.1k resistor. This is to lower the gain of the circuit to compensate for the higher gain from the 50 micron SiPM.
**R4 has been increased to a 1.5k resistor. This is to lower the gain of the circuit to compensate for the higher gain from the 50 micron SiPM.
**Added R21 of 365 Ohms in parallel with R2.
**Added C21 of 10nF in parallel with R2 and in series with R21. C21 and R21 were added to shift the frequency "bump" in the gain at low frequencies due to the increased values of R2, R3 and R4.
= Board 2 =
= Board 2 =