Help with gpm diy mod on sd2100e

Hi Martinus, the 2100 is different and the same method for performing the GPM is not possible. It is done different and unfortunately I do not have photos. However, if you look in the same places for 47K resistors you use the same method and put a 33K resistor and use a 20k pot with a resistor in parallel with it to get the pot's value to around 14K so the end result is 47K. The mod works similar but instead of increasing resistance as in the 2000 you lower the resistance to get a gain improvement as the 47K resistor is in series with the circuit. It is done this way as the feedback resistor on the op-amp in a 2100 is 1Megohm and not 100K as in the 2000. unless you can get a pot with a much higher value than 1M and do it the same as the 2000 to increase the gain but I am skeptical it would work this way. Hope this helps. If you're in Australia best to call for a better explanation.