JLM AUDIO

Yes regurg kit is made to do bal in to bal out with up to 18dB gain. The 60w amp kit is a slave amp hi made to take high line level. Most guitar amps are actually a preamp with amp. If using our 60w amp kit you can get more gain from the amp by making the 1k resistor small value. Also if not using t...

Yes regurg kit is made to do bal in to bal out with up to 18dB gain. If using our 60w amp kit you can get more gain from the amp by making the 1k resistor small value. Also if not using the volume control on the amp kit use the volume+/- as the audio input instead to get a few dB more gain from the ...

Hi there! I built a LA500 and to my amazement it worked straight away. It sounded fantastic, I was super happy with it and was gleefully using it as my main vocal compressor on the way in. I had it up and running for about 3 weeks. Since then I've had some issues. At some point the Rupert Neve R6 c...

survivorsound wrote:For gains between 6dB and 12dB, one would add a resistor across the gain pads, correct?

Yes correct add 6k8 across the gain pads for 10dB.

I'm sorry Joe, i ment to update my post... Mic worked fine using the standard (2 x 6k8) supply as on the pcb. It's an Astrada conference mic 952.353UK (just the gooseneck mic part) All working nicely on our Calrec. I added a 1k Log pot across the output for volume and a cheap OEP a262a2e transforme...

So i couldn't find a high brightness LED that would work so i made a little TL072 buffer circuit to drive an GR LED. Works well. Next question.. How would i go about powering an Electret (TB) mic with this circuit? Can i just remove one of the 6K8 resistors and put a 9V zener across the PP to ON ju...

Miko wrote:I need a simple 8 into 1. Would any additional resistance be required for tying L to R?

No extra resistors needed. Just link L+ to R+ and L- to R- and you have 8 to 1.

Hi Joe, I CHanged the Regs and everything works fine now. Thank you for your help. I have a question too. In the power plant page, its written that can feed 4 modules. Even those telefunken or neumann cards with 2 channels per module?? Thank you! Cool great to hear you got it working ok. As long as...

I think i worked it out by myself. There's a huge pad on the input, 40db. It's extremely hard to read from the schematics. What i ended up doing is this. A new pad in front of the input transformer (Lundahl LL2603 1:1) thats attenuating 25dB.The secondary of the 2603 is terminated via 2k plus 1,6nf...

Hello Joe, Oh ! Then I have decalibrate my new VUPPM :oops: I'm not in my studio this week so I can't recalibrate it now but when I try the first time, my problem was that the VU/PPM trimpots had no action. (The green VU level didn't move) Is it possible ? I will try again ASAP and tell you ! Thank...

Hello Joe, I just received your wonderful VUPPM 500 Meter, thank you very much ! I have tried to calibrate the VUPPM as describe : Send in 1k tone at 0dFS or +18dBu to 500 Input for left and Output for right. Set mode to VUPPM mode RED PPM with GREEN VU over the top. Adjust Left and Right level tri...

Hi thanks for your reply. I cleaned the pcb with isopropilic, but is dificult to take a picture showing the traces, cause it shines with the light I hope you can see something. So I have to change one of the regs, or better both? one or both The trim for the 24v now doesn't works, I dont know if I ...

Oh, I thought I sent it attached. Let me try again The bottom of the pcb needs a good clean with isocol or iso prop and toothbrush to see properly but I can see that one centre leg on the trimpot has never been soldered so will not work. Since the 3 x 120R burnt the 48v reg is likely to be dead sho...

Hi! Im having some problems with my second power plant. Some 120r resistors got burned and I changed them with new ones. Now the 48v rail marks 24v And 24v. Rail marks 35,6 v. Im sending you a photo if hepls. Thank you very much! Ok yes attach some photos of the top and bottom of the pcb here or em...

Hi Joe, Here is my sad tale: I built a v3 AC/DC with 48v and +/- 28v and it worked great for many months powering a DIY mic pre. Then one day it blew a mains fuse, I disconnected from the mic pre, replaced the fuse, and 48v had turned into 5v. I then replaced R7 because it was blown up and D10 beca...