JLM AUDIO

Hello Joe, I hope you´re fine. Just a short one:On an amphead I´ve built I have a small issue.I did the "mono/mute/on"-mod by implementing a switch as described from you before. Sadly in mute position as well as in pot position fully ccw (which is the same function,right?) it doesn´t mute completely...

Joe Malone wrote:
HI Udo

This is explained in the first post on this thread in the build info. This is a PCB update only so no resistor mods are needed.

Thank you Joe,

I must have overseen this (btw,have you seen my little review on the la500? )

Cheers,

Udo.

Hello Joe,

Can you please explain what "rev 2" means,is it soft-and/or hardware changes?

Thank you in advance,

Udo.

Hi Joe, Maybe you haven't seen my previous post.I'm about to calculate currents in my new 51x racks.Am I right thinking that when LA500s operated in a 51x rack they use the 24v rails and leave the 16v rails untouched?I'm thinking of a useful assignment of my mixed up audio modules,that's why. And an...

Hi Joe, finally I had the time to do some testing of my 2 LA500s.Have built them a while ago,but my students give me way too much work ("diploma time") :) Now what can I say except of AWESOME! Building : It is really easy,everything is well documented,your help is super great as always.Adjusting the...

Hi Stephen, Identifying pins on op amps is easy. Look at the ic,there's an orientation mark on it,sometimes a dot. The pin to the left of it is always pin 1.Just count counterclockwise arround it. Also you can have a look at the ic datasheet,it is described there very well. Hope to have helped, Udo.

Hi Joe, just a quick question on the schemo in the first post of this thread (LA500 PCB). The nice yellow connection signs do refer to the card edge connector,no? If so:Shouldn´t the link pin be #6 instead of #5 (#5 is used for audio gnd on the connector)? Also the psu 0V at the bottom of the page s...

Yes we will have a small Hammond case and scale front panel solution available on the web shop in the new year for stereo meter like shown in the photo's on the jlmaudio facebook. Cool!So in the beginning of the new year (sorry,please excuse my impatience) :) And a horizontal beveled edge scale for...

Fantastic work Joe!
These (Crockwood-) Meters look sooooooooo beautiful!!!
Are you going to sell the panels (the acrylic/perspex part) in your shop as well?

Best regards from munich,

Udo.

As for size do not know what you are planning to run from the powerstation? Or what current you think you will need? Hi, best way to find out is using Joe´s calculator: http://www.jlmaudio.com/ACDC%20Calculator.htm You can fool around with the voltages and currents there. The needed watts in VA for...

Joe Malone wrote:

Here it is-10cm (width) of pure mixing power! Udo (having a lot of fun).

The 3 input submix schematic you sent me will work fine. You do not need the 10uF caps on the sub mix H pads. The sub mix will loss 20dB of signal level. So changing the 1k gain setting resistors to 100R will make up the 20dB and restore the amp head to the usual 15dB overall gain. Hello Joe, cool-...

Hello Joe, me again. Have decided how to build my "satellites" now: There will be 4 satellites for now (maybe later up to eight). Each with 3 inputs in stereo with a mono switch. Your board will be/have the master level control with mute switch. So paralleling these satellites should not be a proble...

Nice. You have a small factory of custom gear on the go all at once there Udo. Hahaha...not really,but I went into diy about 2 years ago,got "triggered"/infected and started way too many projects I was dreaming of :lol: Now they show up piece by piece-the panel I posted is about 1 year old,and I th...

Yes, I have no doubt your circuit is good! I just wanted to throw one together quickly to play with, and thought/hoped you may know off hand what I did wrong based on my symptoms. I had intentions to order some of your PCBs and actually ordered them today. It´s worth it-no doubt! Here´s a "teaser":...