Search found 8 matches

by frazzman
Mon Jul 09, 2018 4:46 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

Hi Joe, I have 2 of these power amps running happily in bridged mode using a 2x18 160VA toroid. I’d now like to use this power amp to drive 2 passive speakers. So my question is, are there any issues with “converting” this to dual mono, but leaving the toroid as is (2x18)? As I understand it, a 2x25...
by frazzman
Thu Feb 23, 2017 7:43 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

Thanks Joe, I just sent you an email
by frazzman
Wed Feb 22, 2017 3:58 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

Bottom view
by frazzman
Wed Feb 22, 2017 3:52 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

I'll test the bridge rectifier tonight. In the interim, here's the post-Mortem.. Not pretty. Obviously a lot of the top pads are ruined but the bottom pads have now cleaned up relatively well. Given the state of the PCB - Is there a schematic or PCB overlay that I can use so I can measure continuity...
by frazzman
Tue Feb 21, 2017 10:05 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

As I mentioned, the LM3886 on other channel has also fried, so I am inclined to think there is some issue that is common to both, as opposed to a tiny bit of metal causing a short. A short between one power rail and output or 0v would pull over 50v to the other rail for a split second which would k...
by frazzman
Tue Feb 21, 2017 9:21 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

Hi guys, I had a nicely working bridged version of this power amp running well, albeit without a proper enclosure. The enclosure had since arrived and everything has been rehoused (without any change to the wiring configuration) - quite literally a transplant. Anyhow, upon first power up the LM3886...
by frazzman
Tue Feb 21, 2017 8:12 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

Hi guys, I had a nicely working bridged version of this power amp running well, albeit without a proper enclosure. The enclosure had since arrived and everything has been rehoused (without any change to the wiring configuration) - quite literally a transplant. Anyhow, upon first power up the LM3886 ...
by frazzman
Sat Feb 04, 2017 6:05 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 337449

Re: JLM 60Watt Power AMP Kit

Hi all, Just finished building a bridged amp, very nice and loud sounding unit! I haven't had the chance to use it extensively but I did give it a go yesterday to drive a 4x12 guitar cab fairly hard. I noticed that on one channel the LM3886 ran considerably hotter than the other. Both have the same ...