OK email me so we can workout the pot kit or parts you need
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- Thu Feb 08, 2024 7:50 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
- Replies: 126
- Views: 347349
Re: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
- Wed Feb 07, 2024 4:18 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Yessaxmonster wrote: ↑Wed Feb 07, 2024 3:44 pmThanks Joe,
Once I get them equal should I drop the output of my daw so that I get 1.23vac on both opto outputs so I can zero out the meter when I recalibrate?
- Wed Feb 07, 2024 3:14 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Hi Joe, I have started to work with figuring out what exact resistor size I would need. I have not made any changes or soldered anything yet. In doing that I decided to setup my Apogee duet interface to use for the REW Signal generator because both outputs are equal on that. With that said I sent 1...
- Wed Feb 07, 2024 2:37 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
- Replies: 126
- Views: 347349
- Wed Feb 07, 2024 1:41 pm
- Forum: JLM Audio Kits
- Topic: FREQ500 KIT Build Thread
- Replies: 17
- Views: 45158
Re: FREQ500 KIT Build Thread
Hello Joe, I just completed my first of two Audio Path PCBs. Per the build guide, I went to test it, inserted the two jumpers, connected it to an extender...and when I powered on my rack, the two 4R7 resistors instantly fried. Any troubleshooting tips? Best to post here or send me photos of the top...
- Tue Feb 06, 2024 7:32 am
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Thanks again for all you help Joe. You can add a resistor across channel B makeup pot outside pads to balance the outputs exactly. Somewhere between 240k and 330k should balance it perfectly at the minimum makeup setting. When you have it balanced adjust the interface so both MAC outputs are 1.23va...
- Mon Feb 05, 2024 9:11 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Check with VU/OFF/GR in off that you have identical output levels ? Y/N I have both channels of the opto receiving 1.23 VAC and the outputs of the opto are the same but they have dropped to 1.197 VAC. This is hard relay bypass so the level difference is your interface sagging slightly under the loa...
- Mon Feb 05, 2024 2:06 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Sorry but I am still confused on the inside / outside part. Before I pull these boards out because I can’t reach the front six soldering points cause they are covered by the case lip. Can I measure from the back 6 solder pads on each pot? Are these part of the switch or the potentiometer? I have ci...
- Mon Feb 05, 2024 9:46 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
- Replies: 126
- Views: 347349
Re: LA500A opto comp MAY 2021 BUILD THREAD 500/51X
Okay so terribly slow with this over new year but I sourced some pot cleaner and the problem has remained unfortunately! OK as I mentioned up the page. Can you get the pot of the pot PCB ok without damaging it? Otherwise you will need another pot kit. Ok managed to get make-up gain pot off the PCB ...
- Mon Feb 05, 2024 9:23 am
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
If the voltages don't match turn off the comp and leave off for a while and measure the outside pins of the threshold and makeup pots still fully CCW. (Like left threshold 95.76k and right threshold 102.54k and left makeup 9.33k and right makeup 11.11k. be as accurate as you meter shows) Which ones...
- Sun Feb 04, 2024 5:57 pm
- Forum: JLM Audio Kits
- Topic: MAC Rack kit Build Thread from October 2023 with slow attack led
- Replies: 39
- Views: 41310
Re: MAC Rack kit Build Thread from October 2023 with slow attack led
Does anyone know how I can get the two channels a little bit closer in measurements. It seems that I have to throw a lot more signal at channel B than A by looking at the Volts AC. VAC. Almost .5 DB extra on the fader coming out of my DAW to get 1.23 VAC on the B Channel. Is it the output pots that...
- Tue Jan 30, 2024 12:01 pm
- Forum: JLM Audio Kits
- Topic: JLM 60Watt Power AMP Kit
- Replies: 261
- Views: 744567
Re: JLM 60Watt Power AMP Kit
Hi Joe I have built the amp I got from your shop last Monday morning and it is going very well. Thanks for all your help. I believe there is a 'mod' I can do "With no volume control fitted the +/-vol pins can be used to do EQ like low end extension by adding a resistor and capacitor" What resistor ...
- Tue Jan 30, 2024 11:02 am
- Forum: JLM Audio Kits
- Topic: MONO Ver2 Mic pre kit BUILD THREAD
- Replies: 27
- Views: 95084
Re: MONO Ver2 Mic pre kit BUILD THREAD
super, Joe, thank you! just to make sure I understand correctly, is the below roughly what you mean? And is there a way for me to understand how to calculate the value for R13/R14 correctly? If it's too complicated to explain, let's just say I'll stick with the NE5532A :) Yes that is correct. NE553...
- Tue Jan 30, 2024 10:23 am
- Forum: JLM Audio Kits
- Topic: MONO Ver2 Mic pre kit BUILD THREAD
- Replies: 27
- Views: 95084
Re: MONO Ver2 Mic pre kit BUILD THREAD
If I'm building this, I'm thinking I might as well take the chance to customise it to my needs, and I'm wondering can I annoy you with a few more questions? I'd like to add a mute switch (with LED lit while muted), an extra Balanced TRS output, and an extra unbalanced TS out for using a tuner (only...
- Mon Jan 29, 2024 11:19 am
- Forum: JLM Audio Kits
- Topic: JLM 60Watt Power AMP Kit
- Replies: 261
- Views: 744567
Re: JLM 60Watt Power AMP Kit
Thanks! That sounds like it should work. I want to run 2 or 3 AMP kits from that 300W PSU. Any suggestions how to implement a soft start or delayed start if that proves necessary? Start with no soft start and see if the SMPS can start the amp without going into hiccup mode. Soft start is easy but y...