first thing you may want to do when the UPS man drops off a brand spanking new Graham-Patten DMIC-20 (48kHz version) is to.........
1. open the damn thing up and locate the Analog Devices SSM-2017 mic preamp IC.
2. replace them with the BurrBrown INA-217 mic preamp IC.
3. see how fast you can melt the AD SSM-2017 with a butane lighter.
sorry, no photos.
4. plug in a custom Canare BNC>Coax s/pdif cable
5. think of ways to bug ToddR for tips on Gain Pot mod.
6. feel bummed because i don't have another show coming up until end of December.
marc
Just for the record, the Todd R that does the gain mods on the DMic20 is not me -- different Todd R from the DC area. I'm pretty sure he's on this board, but I don't know his handle.
Marc -- good to hear you've tried out the INA217s instead of the SSM2017s. I always felt the MV100 and DMic20 that uses them were a bit harsh in the high end. Did you ever notice this and do you think the INA217 replacement smoothes out the high end at all?
todd;
ahhh seee. thanks for the clarification.
as for the INA217 vs. the SSM2017, i immediately noticed the clarity and the lower noise floor in my recordings. perhaps the clarity was due to the smoothness in the highs, but i didn't pick up on the "smoothness" aspect of it immediately. i just lumped the sonic difference as "clarity".
what op amp is a good replacment for the OP275? the slew rate on the OP275 is not too high.
thank you for much of the inspiration to my DIY bug
marc