Search found 1892 matches

by Joe Malone
Tue Nov 29, 2022 8:09 am
Forum: JLM Audio Kits
Topic: BAN Build Thread
Replies: 132
Views: 295704

Re: BAN Build Thread

Hello. I have a BAN related question, and I wonder if anyone here can help. I am thinking of building a fully balanced passive summing mixer (32x4x2) which has 4 group busses feeding one main mix bus. So 32 inputs in total, which are divided into 4 sets of 8 inputs feeding one stereo sub group bus ...
by Joe Malone
Sun Nov 13, 2022 8:17 am
Forum: JLM Audio Kits
Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
Replies: 29
Views: 16526

Re: LA500A opto comp MAY 2021 BUILD THREAD 500/51X

OK, I just built my extender cable. I have 1.23v using the Audio Test program linked. Power on, VU lights up, no LEDs. Not sure if that is correct. VU is pegged to the right. The 0VU trim pot has no effect on the needle. If I switch to GR the zero GR trim pot does work, I'm able to zero that one. T...
by Joe Malone
Sat Nov 12, 2022 11:57 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
Replies: 29
Views: 16526

Re: LA500A opto comp MAY 2021 BUILD THREAD 500/51X

I built the LA500A, for the most part it was a breeze, much better lay out and instructions than the last 500 kit I built. I'm hung up on the setup. My extender should be here tomorrow. Is there a video, or some more detailed instructions on the setup? The only one that I'm really stumped on is ste...
by Joe Malone
Fri Nov 11, 2022 9:56 am
Forum: JLM Audio Kits
Topic: LA500 Slow attack mod
Replies: 28
Views: 47371

Re: LA500 Slow attack mod

c1184701 wrote:
Fri Nov 11, 2022 12:26 am
I'm finding the slow attack mod just a bit too slow on my pair of LA500s. Would it be possible to tweak the attack time by swapping the 100uF capacitor for another value?

-Ross
HI Ross
Yes smaller value caps = faster attack. If you do not know which way +/- is then use Non Polar cap type.
by Joe Malone
Mon Nov 07, 2022 8:55 pm
Forum: JLM Audio Kits
Topic: PEQ500A kit BUILD THREAD
Replies: 12
Views: 1233

Re: PEQ500A kit BUILD THREAD

Hi Joe

Got it all done thanks again Joe
These things sound incredible.

Thanks

Sean
Hi Sean
Cool great to hear you got it all working. Yes the PEQ500A is a very sweet EQ and the new C0G caps just make it even better :D 8)
by Joe Malone
Mon Nov 07, 2022 3:48 pm
Forum: JLM Audio Kits
Topic: PEQ500A kit BUILD THREAD
Replies: 12
Views: 1233

Re: PEQ500A kit BUILD THREAD

Hi Joe I have question regarding testing / matching the PEQ500 So im sending a 1khz tone to the 500 rack with eq inserted power off and eq set to in I cant seem to get the trimpot to move the test tone at all. When 500 rack power on i can adjust the level of the 1khz tone Just wondering am i doing ...
by Joe Malone
Mon Nov 07, 2022 9:47 am
Forum: JLM Audio Kits
Topic: Scorpion Tube power Supply Build Thread
Replies: 15
Views: 3196

Re: Scorpion Tube power Supply Build Thread

Holger wrote:
Sun Nov 06, 2022 5:38 am
The Scorpion works wonderful in my 1 Ru mic pre.
Wow Holger that is a super neat and compact dual tube pre. Amazing.

(I copied the photos locally on to the forum as they weren't showing for some reason)
by Joe Malone
Tue Nov 01, 2022 10:01 am
Forum: JLM Audio Kits
Topic: PEQ500A kit BUILD THREAD
Replies: 12
Views: 1233

Re: PEQ500A kit BUILD THREAD

Hi there Quick question I’ve been supplied with 4 x P24 relays On the parts list it says P12 amd also on PCB says P12 Just wondering is it ok to use these or has kit come with incorrect Relays Thanks Sean HI Sean Do NOT fit the 24v relays we will ship you the correct 12v ones today. Seems there are...
by Joe Malone
Tue Oct 18, 2022 1:22 pm
Forum: JLM Audio Kits
Topic: FET DI QUESTIONS
Replies: 27
Views: 62434

Re: FET DI QUESTIONS

I’m going to build the fet di into its own dedicated 500 series module. Are there any changes i need to make to run it on the 16v standard rail? The FetDI circuit will work fine across the +/-16v but the pcb 0v will be at -16v so will have to have a look at how to isolate that and reference the 500...
by Joe Malone
Thu Oct 13, 2022 11:05 am
Forum: JLM Audio Kits
Topic: Regurgitator kit Build Thread
Replies: 120
Views: 233448

Re: Regurgitator kit Build Thread

Would the NE5532a be the opamp of choice if you were to make a single +24V out circuit? and if you were daisy chaining 4 boards together via J1+J2 would the 12v zeners on the other 3 boards be replaced by 1uf mono caps? What would the 2x 10r need to be for that set up? If that 24vdc is floating and...
by Joe Malone
Wed Sep 28, 2022 11:29 am
Forum: JLM Audio Kits
Topic: BA500v2 Mic Pre Amp BUILD THREAD 500/51X
Replies: 29
Views: 10129

Re: BA500v2 Mic Pre Amp BUILD THREAD 500/51X

I am a beginner in electronics, but I enjoyed DIY with this HA. :D I have a question. I figured that the sound would be clearer without the GAIN and Z POTs connected. Is there any negative effects of not connecting the GAIN and Z POTs, other than making it less usable? Also, what would be the imped...
by Joe Malone
Mon Sep 26, 2022 8:45 am
Forum: JLM Audio Kits
Topic: PEQ500A kit BUILD THREAD
Replies: 12
Views: 1233

Re: PEQ500A kit BUILD THREAD

Just finish first test, all sound great. Still wondering tho about the 500r trimpot. Yes I did forget to mention the 500R 25turn trimpot is for setting unity gain and matching level between pairs of PEQ500A. With a 1kHz tone, turn off the power to the 500 rack with the PEQ500A in it. The PEQ500A wi...
by Joe Malone
Tue Sep 20, 2022 7:22 pm
Forum: JLM Audio Kits
Topic: VUPPM500 KIT Build Thread
Replies: 28
Views: 27797

Re: VUPPM500 KIT Build Thread

Hi Joe, sorry for all the questions, but this is the first time I am trying to calibrate something properly like this! I tried run a 1kz 0db sine wave out of my ur824 which I got here: https://virtualzeroaudio.com/pages/1khz-sine-wave it states that it's -3dbFS So my assumption was, that if I playe...
by Joe Malone
Tue Sep 20, 2022 4:18 pm
Forum: JLM Audio Kits
Topic: VUPPM500 KIT Build Thread
Replies: 28
Views: 27797

Re: VUPPM500 KIT Build Thread

Hi Joe, Great, thanks for the clarification on the modes. I was planning on having the VUPPM in my 500 case to measure gain staging along my vocal chain. So I assumed the +18dbu was the way to go. Thinking about it I was wondering if I can just send a test signal out the sounds card to calibrate? (...
by Joe Malone
Tue Sep 20, 2022 11:55 am
Forum: JLM Audio Kits
Topic: VUPPM500 KIT Build Thread
Replies: 28
Views: 27797

Re: VUPPM500 KIT Build Thread

Hi Joe, I just finished building the VUPPM and everything appears to be working fine :) Now I am up to calibration, and I realised that I am unsure on how to "Send in 1k tone at 0dFS or +18dBu to" How about this for an idea: From reading +18dbu = 6.153 VRms I have a bench signal generator (a siglen...