amb
Headphone CouncilJoined: Apr. 1, 2004
Locale: Sunnyvale, CA. USA
Total Posts: 4408 |  posted 03-21-2009 03:40 PM CST (US)   |  | 
johnwmclean, yes, it's measured between output and ground. 0.07V is 70mV. But I won't worry about this measurement too much. Many DMMs can't display this properly anyway.yuk228, how much gain also depends on what source you're planning to use with the amp. If you're using a typical home stereo CD/DVD player, then their output is usually around 2Vrms at 0dBFS, which is "hot". On the other hand, some computer sound cards and portable devices put out 1Vrms or less. I recommend a gain of 5-8 for the headphones you have, but for 4-channel balanced, you need to drop the gain in approximately half (so 2-5) is ok. Note that this assumes that your source still puts out 1-2Vrms. Balanced sources are all over the map on this. rhester, your problem is not with grounding. You simply have too much gain for the D2000s. |
View Post: DIY Workshop » β22: A discrete, cascoded, fully complementary, pure class A amplifier (part 3)
