Search found 4 matches

by msmithers
Tue Jul 05, 2016 1:19 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 245
Views: 257854

Re: JLM 60Watt Power AMP Kit

Thanks Joe. Yep, I see some of C4's extra roll-off in the simulation. I realised by changing from the 2nd order Sallen-Key HPF to the passive 2nd order, I've lost the ability to have high Q on the HPF. (I.e. I have 2 real poles rather than complex poles.) Do you have any suggestions for making the o...
by msmithers
Sun Jul 03, 2016 3:41 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 245
Views: 257854

Re: JLM 60Watt Power AMP Kit

So after some transient simulation and more reading about the LM3886 and stability, I mod'd the board to do the HPF as a passive 2nd order on the input. The gain reduction at DC in the feedback path makes the final response a little steeper than 2nd order. All good. :-)

jlm_amp_kit_2nd_HPF_ok2.png
by msmithers
Sat Jul 02, 2016 2:13 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 245
Views: 257854

Re: JLM 60Watt Power AMP Kit

Hi, I used the AMP kit board to build a 2nd order high pass at about 60 Hz around the LM3886. The LTSpice simulation schematic is shown below. (Not shown are all the power supply, mute circuit and LED components which I did use on the circuit board as is.) R3 represents a speaker 8 ohm load. The sim...
by msmithers
Fri Mar 14, 2014 3:44 pm
Forum: JLM Audio Kits
Topic: BAN Build Thread
Replies: 129
Views: 154621

BAN with phantom power and no output transformer?

Hi Joe, et. al., Sorry if I'm missing the obvious. Can the BAN run with phantom power and no output transformer? The product page says the kit runs on a single 48V power rail, but does this also supply the phantom? Is there anything else I need other than a BAN, my choice of output op-amp, a 48V SMP...

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