Search found 16 matches

by mikeyb
Wed Nov 25, 2015 4:20 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

Hi Joe - where do you get 10uF non polar caps from? RS used to do them but i cant find any reasonably priced ones on ebay?
Do they have to be non polar?

Cheers

mikeyb
by mikeyb
Tue Nov 17, 2015 10:19 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

Thanks Joe - should be trying it tomorrow

mikeyb
by mikeyb
Tue Nov 17, 2015 12:40 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

Thanks Joe - so like this?

Thanks

mikeyb

ps forgot to ask - do i still fit CLoad - i'd imagine i do
by mikeyb
Tue Nov 17, 2015 12:05 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Hi Joe - had another root around and found 35V caps - thanks for the reply
by mikeyb
Fri Nov 13, 2015 2:43 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Just stuffing boards and noticed my 100uF are only 25V - are these ok or do i really need 35V. Got some 50V but they too big!
by mikeyb
Thu Nov 12, 2015 2:45 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

JLM BA Settings.jpg Hi Joe - thanks for quick reply. I'm using OEP and want to try various DOA's including JLM Hybrid/2520/1731/990 I'm contemplating putting a Hi/Lo ratio switch and it says on attached jpg use low ratio parts but fit jumper to high ratio So would i omit Rload and put in place of R...
by mikeyb
Wed Nov 11, 2015 12:30 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

Hi Joe, would you implement the filter like in my above jpeg?

Thanks

Mike
by mikeyb
Fri Oct 23, 2015 3:44 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

Hi Joe - would you implement the HPF like this?
What values for Rf and Cf would you use to implement a 80Hz HPF?

BA HPF.jpg


Cheers

MikeyB
by mikeyb
Sat Jul 11, 2015 9:35 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Yeah Joe - thought as much with the design layout.

Thanks for the reply
by mikeyb
Thu Jul 02, 2015 8:55 am
Forum: JLM Audio Kits
Topic: Adding 80Hz HP filter to a BA
Replies: 22
Views: 22732

Re: Adding 80Hz HP filter to a BA

Hi Joe, I'm hoping to implement maybe a 80/160Hz HP filter, cutting the track between tx secondary and + input on opamp. What typical value of R would i be looking at? Would i use Rl as 27k (oep lo ratio Cl cap) and use the formula 1/(2 x Pi x r x c) > C = 1/ (2 x pi x 27k x 80) = 73nF or 68nF neare...
by mikeyb
Fri Jun 19, 2015 3:04 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Gain of discrete opamps? I'm currently (finally!) building various DOA kits, so far I got JLM hybrid, 990, SGA, GAR2520, GAR1731 and classicapi BB2521 for now to try out in my BAD builds What sort of gain can each stage of the BAD circuit handle. Looking at the JLM99V, that has it's open loop gain s...
by mikeyb
Thu Jun 18, 2015 12:18 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Fantastic! - now i just want to solder :D
by mikeyb
Tue Jun 16, 2015 9:03 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Hi Joe, Was thinking about wether i should use my JLM Hybrid in Class A or A/B. Would it be possible to run a twisted pair or screened pair to a front panel switch or would that make it unstable or noisy? Could this be realised by changing a diode/diodes for a transistor and switching the junction o...
by mikeyb
Tue Jun 09, 2015 10:32 pm
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Thanks Joe - as usual - a quick response :D
by mikeyb
Sun Jun 07, 2015 4:33 am
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 333
Views: 267791

Re: BA BA2 BA4 BAD Dual99v Build Thread

Hi Joe, is there any reason why i couldn,t wire a bad pcb with separate gain pots for each section, i've not got any dual rev 10ks at the moment but have some single rev 10ks. I have some dual rev 5ks pots - could i use these instead?

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