EDA-03287-V2.1
After thorough testing, the below changes have been made to all six EDA-03287-V2 prototypes. This mainly to correct the switched power supplies and front-end division/filtering and frequency response.
- replace R2_I., R3_I.,R4_I., R5_I., R96_I., R97_I., R98_I. and R111_I. with 4k7 Ohm (40 components/card)
- replace C14_I. and C26_I. with 43pF (10 components/card)
- replace R152_I., R153_I., R154_I. and R155_I. with 14k Ohm (20 components/card)
- replace L11 - L15 with 10uH (5 components/card)
- replace D6, D7 with BZV55-B2V7,115 (2 components/card)
- replace R113 with 18k (1 comp/card)
- replace R116 with 0 Ohm jumper (1 comp/card)
- remove C63 (1 comp/card)
- replace C72 with 150 pF (1 comp/card)
- replace C4 with 39k Ohm resistor (capacitor <-> resistor!) (1 comp/card)
- replace R131 with 18k Ohm (1 comp/card)
- remove R6 (1 comp/card)
- replace C71 with 10 uF tantale (1 comp/card)
Consequences:*
- input resistive divider /2 but lower voltage offset due to comparator input bias current; permitted input levels thus still -5/+5V but at comparator -2.5/+2.5V
- DAC output voltages (
10/+10V) divided by /4 for comparator reference> -2.5/+2.5V - supply rails changed as follows to reduce switch current and thus
heating:
- N5V3 at -2.5V
- P6V7 at 4V