huangyong 0 Report post Posted November 3, 2004 bripadi, what you mean I see there is only one bridge (4x MUR860), that's why dreamie use the BUF634 for the 'virtual' ground. if i use the CT (connected to real ground via iec socket) as signal ground, is it ok? Share this post Link to post Share on other sites
dreamie 0 Report post Posted November 3, 2004 bpripadi, Inverting mode is chosen for its simplicity (partly due to the VERY limited range of Holcos available as well ). By the way, sharp eyes. The ground used to be from the +ve and -ve output of the 2 rectifier bridges, but later removed. huangyong, Do you mean the resistor placed at the output of the pre-amp? Regarding the virtual ground question, except for the DEEP bass that's missing after converting, there's no other difference i noticed (I had a short-lived dual trannie-rectifier bridge PS ) However, the deep bass could also be missing due to the 1800uF capacitance per rail I removed. The center-tap of the trannie can be used as signal ground, but note your grounding technique to remove unnecessary noise/hum injected. Share this post Link to post Share on other sites
huangyong 0 Report post Posted November 4, 2004 Do you mean the resistor placed at the output of the pre-amp? YES. Share this post Link to post Share on other sites
dreamie 0 Report post Posted November 5, 2004 Do you mean the resistor placed at the output of the pre-amp? YES. I didnt use that. I notice them mainly in tube pre-amplifiers. I guess it's also to drain the output capacitor's current. Share this post Link to post Share on other sites
huangyong 0 Report post Posted November 9, 2004 Dreamie, where you get those MUR860?? Share this post Link to post Share on other sites
dreamie 0 Report post Posted November 9, 2004 Dreamie, where you get those MUR860?? ON Semiconductor. They are also available from Farnell/RS. Share this post Link to post Share on other sites
