New Posts  All Forums:Forum Nav:

Mini3 R5 question

post #1 of 5
3/19/10 at 11:18am
Thread Starter 
A question about R5 in the Mini3. What purpose does it serve? I can get 5.6R or 6.8R, not 6.2R, can I substitute it with one of these values? If yes, which one? Why carbon instead of metal film? Thanks!
Reply
post #2 of 5
3/19/10 at 11:28am
I would think either would be fine, provided it fits well physically, per amb's notes in the parts list. Note that the Farnell part number shown (Farnell 9343504 (6.8Ω)) is a 6.8 ohm. I am guessing carbon film is acceptable for damping? Metal film is also fine here per the parts list.
Reply
post #3 of 5
3/19/10 at 11:51am
IIRC, R5 is there to isolate the output of the op-amp against the possible capacitance of the cable.

I think it is spec'ed as a carbon as it is hard to find the right physical size resistor in metal film.
Reply
post #4 of 5
3/19/10 at 2:41pm
The R5s help keep you from blowing up the op-amp if you happen to uplug the headphones while the amp is on (the AD8397 has no output short circuit protection).
Reply
post #5 of 5
3/19/10 at 3:05pm
Thread Starter 
Thanks all for chiming in, I really appreciate it.
Reply
New Posts  All Forums:Forum Nav:
  Return Home