With a CLC or CRC filter, the first C is tied to the HT center tap—in isolation from the second C and remaining zero-volt line(s). However, in an LCLC filter, is there any benefit in grounding the first C in a similar fashion? My assumption is no, since the charging pulses are dramatically reduced, but I thought it couldn't hurt to ask.
Searching the forum didn't return much on the topic.
Searching the forum didn't return much on the topic.
There is still benefit, although as you say less benefit as the charging current is smoother - provided that the choke input supply is being used above its critical current.
Thanks for your input, DF96.
Let's phrase it this way: for those of you who've built LCLC in the past, how did you ground your filter caps? My upcoming build will be bridge rectified into an LCLC in a separate PSU. The only grounds in this box will be from the two 50uF filter caps, safety earth, the PT primary and secondary screens, and ground reference for the filaments. An umbilical will carry safety earth and the combined zero-volt lines from the amplifier chassis, in an arrangement like: http://www.diyaudio.com/forums/atta...nderstanding-star-grounding-good_ground_8.gif
Let's phrase it this way: for those of you who've built LCLC in the past, how did you ground your filter caps? My upcoming build will be bridge rectified into an LCLC in a separate PSU. The only grounds in this box will be from the two 50uF filter caps, safety earth, the PT primary and secondary screens, and ground reference for the filaments. An umbilical will carry safety earth and the combined zero-volt lines from the amplifier chassis, in an arrangement like: http://www.diyaudio.com/forums/atta...nderstanding-star-grounding-good_ground_8.gif
The main aim is to take the gnd link for the next stage directly from the negative terminal of the preceding cap (as that point has the least noise on it as it is closest to the capacitors internal negative terminal).
- Status
- Not open for further replies.