JLM AUDIO

For unbalanced signals do you mean tie both the + and - inputs to the signal source, or should one be connected to the source and one to ground? +in to signal center conductor of unbalanced cable and -in to shield of unbalanced cable. If using the circuit with a dual PSU, obviously the half-rail bi...

Hi,... Can we cut/transform the 8pakamp pcb to 2x4pcb´s to a different boxes, for example? Thanks, Luís If you are very careful you could use a sharp Stanley / utility / box cutter knife to V score the top and bottom of the PCB against a metal ruler several times until the copper is cut and a good ...

Joe...This is great news...I'll be getting my order in post haste. I know you will busy updating this thread with details like transformer details and bridge specs needed. Likewise the hook up notes for bridging and inputs etc. I think the pricing is very reasonable, and from the looks of thing a l...

8PAKAMP kit is a 8 channel version of our popular 60W AMP kit. We originally designed the 8PAKAMP for a large Dolby Labs project we did a while ago. 8 x 75Watts of power configurable for making active monitors or full surround sound amp setups in lots of combinations on 184mm x 81mm PCB (eg 4 x 140w...

Joe, I have 24-position switches, and I'm thinking of implementing 2dB gain steps. Assuming 1% resistors, how well matched would gains be between channels? Thanks! Paul HI Paul Easy one. With all resistors 1% there are 2 gain stages so 4 resistors all with 1% tolerance so +/-4% error. We do find th...

Thanks Joe. That's all very clear. One last question: to cut on the gain attenuator steps (12 or so) I'd like to have a fine gain pot to cover inbetween (5-6 dB). I suppose this could be done tapping into the feedback loop of IC1 but, again, I'm not up to grasp if the DC present will play havoc wit...

Hello Joe, I've recently purchased an LA500 (used, built by someone else) and ran into issues with calibration. I followed the instructions you've outlined methodically. I used a 1kHZ sine tone generated by "Test Osc" in Logic Studio through my Digi 003 interface. When I set it to -18dBFS, which is...

slb1959 wrote:Hi,...
Maybe i need to make 2 or 4 mono amps, but first i like to "see" how sound looks.
Do you have the same pcb to a sub-woofer amp?

Thanks, Luis

A pair of AMP kits can make a 140w amp for a sub but I do not have a sub filter PCB which should have a 12 to 24dB filter slope.

Hi,.. "Yes JLM Audio web shop excepts Paypal" Aceppts or excepts? Woops. Accepts Paypal The Dingo Pup is a good solution for the input module? Yes a dingo pup would allow for balanced in to unbalanced out for volume control and then unbalanced output of volume control to balanced out to drive amps ...

A little update to my last review. I´ve used the LA500 on sax last weekend at a show which I frequently mix ( http://www.michaeljacksontributeshow.de/ ). Creamy, easy to dial in and versatile is what I´d call that comp. It was the best sound I had with that player for ages! I´m going to sell my oth...

Hi everybody. I’m interested in some BAN channels but I’ve got some questions, some of them probably pretty basic since I’m only a musician and unfortunately no EE. Sorry for weak English too. 1.Input transistors: I’m interested in jfets, a pair of 2SK389 would need to be matched? And what about 2S...

Hi Joe, Can the DI or it's ribbon cable have something to do with it? I looked at the ribbon and it seems kind of tight in there between the VTX and the back of the DI pcb... There seamed to be a tiny tiny hole pierced in the ribbon by the slightly protruding capacitor legs at the back of the DI pc...

Hi,... I hope that picture are with better resolution. OK looks right. But are you using the same box and woofers and tweeter as described a few pages back on this thread as this will only work for that exact configuration. Volume control can be done with normal dual 1k to 10k log pot. I can draw h...

Hi,.. Few weeks ago i repair a Active Speaker from a friend. The amp is a 3xlm3886. Two for the woofers and one for the tweeter. I like to make one pair or two for me. I gone by some of your pcb´s, but the shipping cost,.. :( No sure what you mean about shipping cost as it should only be about $10 ...

no2 wrote:Alright, thanks so much Joe!!!

I'll definitely recommend this experience to other audio nerds I run into.

It sounds great too.