JLM AUDIO

Hey Joe, So I've got one built and running but it seems as I dial up the "Impedance" control there is a hum or even a "ring" that comes on. With "Impedance" all the way down it sounds pristine. Could this just be bad grounding from my outlet? (Old house, iffy grounding). Sorry missed this notificat...

Just finished up a pair of these bad boys, set the levels with the trim pot and ran some music through them to make sure everything was working. I think I am in business! I think When I get a chance I think will run some tests with Plugin Doctor just to make sure there are not issues I am missing. ...

robranogajec wrote: ↑

Thu Sep 07, 2023 2:44 pm

Thanks Joe. It was one of the solder joints on the relay.

Is there a schematic for the PEQ500A?

Cool great to hear you got it working.

I prefer not to hand out the schematic but will help fault find always.

Joe. All sorted. 😺😺 Thanks for the two PEQ500A kits. I have built both kits, and am testing them with plug-in doctor. I noticed that on one of the kits only, when I turn off the eq (eq out), the low frequency boost circuit is still operating, and changing boost and frequency affects the output, eve...

Hey Joe! Got everything calibrated and the process went smoothly. When demoing the comp everything works as expected except for the threshold control and the compression itself. The threshold has no noticeable effect on the signal until turned about 3/4 of the way where it begins to introduce a hig...

Had a blast building this but am really just stumped with figuring out how to get a proper test tone going through the box. Apologies this is kind of a dumb question, I've just never calibrated a VU meter before. At the moment, I only have a laptop with a headphone jack and a MOTU interface with st...

Had a blast building this but am really just stumped with figuring out how to get a proper test tone going through the box. Apologies this is kind of a dumb question, I've just never calibrated a VU meter before. At the moment, I only have a laptop with a headphone jack and a MOTU interface with st...

Thanks Joe, It turns out that the SS relay coil has gone open cct. so no switching occurring. Voltages are all good. Can you supply a brand/part number for a replacement relay from Jaycar or Altronics? Cheers, Neil. HI Neil ok that is unusual as the 24v coil can handle 48v. Altronics part S4132B 24...

Hi Joe, I have a stereo1290 mic pre with the FET Di ahead of it, and on one channel I am getting Di signal to the output but not mic signal. Trying to fault find and wondering if the SS relay might not be switching the signal correctly. Can you supply cct for Fet Di, and/or SS relay pinout, Thanks,...

Joe, Wondering if you have any idea when you might have an easy drop in version of the JLM2503 for the M1532 (i believe you mentioned it to me a while back)? I'd love to try them on a pair of matrices now that I've got things recapped, inductorized, and DOA'd. Kinda feels like the final frontier. A...

An old thread but I’ll try here first. When using a Hybrid in a BA is the only component to be left out that one 470nf cap? I thought I saw something somewhere about leaving one of the 100uf electro caps off. Ta. The only part to be left out is the power rail smoothing from +v to 0v which will be a...

On third thoughts it would be very interesting to know at what sensitivity selector position the JLM traces were taken. ?? From experiments with the GA version, there is a clear jump in overshoot/ringing behavior when the selector is set at -40, -45, and below. I see that at that point the resistan...

kolchek wrote: ↑

Tue Jun 20, 2023 8:05 pm

An ignorant question: I’m guessing that if i wanted to pad more than 20db the solution isn’t just increasing the value of rpad? Thanks.

If you want to pad more dB make RPad value smaller. Like in Dual99v on BAD PCB we use RPad = 51R to make 26dB pad.

Hi, i just need some advice with the VU2 stereo buffer. i build it and tested , and it works perfect with a small radio VU meter so all good. Then i tried with a new Sifam vu the: SIFAM AUDIO LEVEL METER AL39WF and it did not work as supposed , after calibrating to show 0 VU i lower 1 db and the me...

Would this DC/DC converter fit the bill? Seems to fit the voltage spec of the OP-amp and avoid the need to reinvent the wheel(also Im terrified of working on power). I think this would help a lot of other people. Thanks! While it would power it. It is also way overkill and likely to inject lots of ...