Author Topic: one woofer pump_ground issue?  (Read 5260 times)

Offline data

  • Sr. Member
  • ****
  • Posts: 308
  • Liked: 19
Re: one woofer pump_ground issue?
« Reply #40 on: January 08, 2015, 09:24:00 PM »
OK, this is oscillating still i think.

A whooshing sound from speakers at low level that increases with volume, and checking the outputs for DC shows symptoms of RF with small but erratic DC readings, between about .7mv and 15mv. The low whooshing is variable like the variation of those DC readings.

Damn it, just when i was going to get some RS caps for it, so now that will have to go towards sorting this.

Edit: Now not doing it, this stage drives me nuts at times, but great when it is not  :D
« Last Edit: January 09, 2015, 01:53:15 PM by data »

Offline data

  • Sr. Member
  • ****
  • Posts: 308
  • Liked: 19
Re: one woofer pump_ground issue?
« Reply #41 on: January 13, 2015, 05:16:50 PM »
Hmm...oriented the board a different way and things seem more stable and hum is near non existent.

Meh...It's a forward step anyway :)