Buffer Stage. One Per Output Needed

Published:2012/10/25 3:13:00 Author:muriel | Keyword: Buffer, One Per Output | From:SeekIC

These buffers should use high quality opamps, and they are included on the PCB, including the trimpot (see the photo at the beginning of this article). Several people (including me) have found that the crossover unit has a short 'chirp' or 'snap' (depending on the opamp characteristics) as power is removed, and this may be accompanied by some DC swing. If you use the new version of the P05B preamp power supply, the auxiliary output can be used to activate a 6-pole relay (or as many smaller relays as needed) to short all outputs to earth when there is no power. The normally closed contacts simply short the outputs to ground, and when power is applied the short is removed. P05 (Rev-B) boards have a power-on delay and a loss of AC detector that will mute the crossover for a few seconds at power-on, and almost immediately when power is turned off.



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