ProtoDAC TDA1387 X8 project

[hifinet]

The difficulty in adjusting the voltage on these is that you are working with standard value resistors. It's sometimes easier to add resistors in parallel to the 1500 ohm to get a value that is close. For example, with a 13,500 ohm resistor in parallel with the 1500, the resistance is 1350 ohms, and the voltage output becomes 4.69V with the 470. 

In this case, I would add a resistor to substitute for the 0 ohm R3 (top resistor). Resistors come in standard values. A 47ohm in place of the R3 (470 + 47) would get you 4.72V with my module, give or take. Check my math.

I have some other LT1963 modules purchased earlier. Much nicer reflow soldering of the resistors. Also, the values of all three were visible. R3 471 (470 ohm), R2 0, R1 152 (1500 Ohm). Got some measurements. They are 0603 (in) or 1608 (mm) in size. That's 1.6mm length and 0.8mm width.