Search found 86 matches
- Fri Dec 02, 2016 9:38 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 467625
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
HI Udo Great to hear from you. Sorry to hear about the LA500A playing up First unplug what ever is plugged into the input of the LA500A to make sure the noise is not coming from further up the chain. But since bypass removes the noise this should be not be the case but always best to double check w...
- Fri Dec 02, 2016 3:14 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 467625
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Hello Joe, long time no hear,hope you´re fine,hahaha….. You know I have a bunch of both the old and new versions,and they´re still my favorite compressors. Now I have an issue with a LA500A at my work. It worked perfect for a year or so in an exclusive tracking chain,at least 4 to 5 days a week,and ...
- Fri Aug 05, 2016 9:29 pm
- Forum: JLM Audio Kits
- Topic: AC/DC & POWERSTATION KIT BUILD THREAD
- Replies: 350
- Views: 811309
Re: AC/DC & POWERSTATION KIT BUILD THREAD
Joe, When the LM337 is completely disconnected from the chassis (the other two still mounted), I still read a short from the tab to the chassis...but only on this regulator. Any thoughts? Thanks! From what I remember the neg. reg. LM337 has an internal connection from input to its' metal tab (for h...
- Fri Nov 27, 2015 2:07 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 467625
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
HI Udo Thanks for the great review here and on our web site :-) Yes we have just found the latest batch of 10000 blue leds (which are supposed to the be the same ones we always get) are different. They need total 240k = 2 x 120k. Remove one 470k and place it under the pcb across the other 470k and ...
- Thu Nov 26, 2015 8:26 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 467625
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Hi Joe, another pair finished here.All great.Top sounding,slow attack is a great thing. One little issue:Both blue leds don't seem to work in link mode. Before I check for accidently reversed leds (I thought they were in the right way,but who knows :roll: ) I wanted to ask if 1meg (formed by 2 x 470...
- Mon Aug 18, 2014 5:19 pm
- Forum: JLM Audio Kits
- Topic: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD
- Replies: 60
- Views: 270412
Re: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA
Great,thanks a lot Joe!Joe Malone wrote: Since the input to your OLED module is 51k then 1uF should be fine.
Have a nice day (I will ),
Udo.
- Mon Aug 18, 2014 3:43 pm
- Forum: JLM Audio Kits
- Topic: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD
- Replies: 60
- Views: 270412
Re: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA
Pin 1 of the TL074 is the unbalanced output of the balanced in amp so should work for you. This is after the input level trimpot as well. Probably best to add a series cap if the unbalanced inputs into the X-Y OLED are not already cap coupled. Thank you Joe, very helpful because I can't find your (...
- Sat Aug 16, 2014 3:43 am
- Forum: JLM Audio Kits
- Topic: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD
- Replies: 60
- Views: 270412
Re: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA
Hello Joe, long time no hear,hahaha....hope you're fine. I have a question as follows: I want to add on a little OLED based meter capable showing X-Y mode for correlation ("Jellyfish"). It has unbalanced inputs with around 51k input impedance. Can you tell me a good point to tap off the unbalanced s...
- Wed Feb 05, 2014 3:43 pm
- Forum: JLM Audio Kits
- Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
- Replies: 223
- Views: 598306
Re: LA500 opto comp leveling amp BUILD THREAD 500/51X
Hi friends. I'm new to electronics so bare with me. I've built an LA-500 and the VU meter keeps drifting off after I calibrate it to 1.23 vac. On GR mode, the meter drifts above 0VU after I've calibrated it. And on VU mode the meter always sits between -10 & -7. After the most recent calibration, t...
- Sat Dec 21, 2013 9:11 am
- Forum: JLM Audio Kits
- Topic: dINgO Pup kit BUILD THREAD
- Replies: 79
- Views: 272796
Re: dINgO Pup PCB and kit now available
Hi Bernhard,
Read my reply on top of this page concerning current,it is less than 30mAs per rail,so yes you'll have enough juice then.
For interfacing with guitar pedal FX read page 2,R3 & R4 should be something like 1 k or even less.
Best from bavaria too,
Udo
Read my reply on top of this page concerning current,it is less than 30mAs per rail,so yes you'll have enough juice then.
For interfacing with guitar pedal FX read page 2,R3 & R4 should be something like 1 k or even less.
Best from bavaria too,
Udo
- Thu Jul 11, 2013 7:56 pm
- Forum: JLM Audio Kits
- Topic: dINgO Pup kit BUILD THREAD
- Replies: 79
- Views: 272796
Re: dINgO Pup PCB and kit now available
Will post a pic when I'm done,will take a while because my frontpanel-supplier is on holidays now.Joe Malone wrote:
Cool good to hear it worked for you Udo and thanks for the current draw info for everyone to use
Best regards from germany,
Udo.
- Thu Jul 11, 2013 5:02 am
- Forum: JLM Audio Kits
- Topic: dINgO Pup kit BUILD THREAD
- Replies: 79
- Views: 272796
Re: dINgO Pup PCB and kit now available
So I modified 8 boards to "unbalanced Pro Audio gear". All perfect,exactly unity gain in a loop. For those who want to know,I measured the current while modding them. Mine have opa2604 running at +/-24vdc. Idle is 22mAs per rail. Generator at +20dBm,1k sine,circuits looped,balancing output looking i...
- Mon Jul 08, 2013 4:48 pm
- Forum: JLM Audio Kits
- Topic: dINgO Pup kit BUILD THREAD
- Replies: 79
- Views: 272796
Re: dINgO Pup PCB and kit now available
Hi Udo Dingo PUP built normally with trim pot on minimum you should have 12db of gain. 6dB from the trim pot gain amp stage and another 6dB from the invert balancing stage. For unity with pro unbalanced gear Change R3 & R4 on the input amp to 4k7 or 5k1 to drop the balanced signal 6dB as it is conv...
- Mon Jul 08, 2013 4:53 am
- Forum: JLM Audio Kits
- Topic: dINgO Pup kit BUILD THREAD
- Replies: 79
- Views: 272796
Re: dINgO Pup PCB and kit now available
Hello Joe, have built my 10 dINgO Pup so far,in general all seems good.Debalancer-Stage works perfect having unity gain. But I have around +9 to +11dB gain on the balancing stage with the trim pot completely wound down (ccw).The pots all work when boosting cw direction nicely,so lots of gain indeed....
- Sat Jun 29, 2013 2:17 am
- Forum: JLM Audio Kits
- Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
- Replies: 223
- Views: 598306
Re: LA500 opto comp leveling amp BUILD THREAD 500/51X
My dynamics -"octopus"
Udo.
Best,Udo.