JLM AUDIO

Mattsoniclab wrote: ↑

Fri Jul 31, 2020 8:55 am

woohoo!
All finished and sounding great. Thanks for the excellent kit and easy to follow instructions Joe. I can see how much work goes into these.
Now to shove some drums through it.

cheers.
Matt

HI Matt
Great to hear you liked building the comps Hopefully the drum tracking went well

Hello! I've used the Go Between kits on several projects now but I just tried adding a Variable Pad kit to the front end of a preamp for the first time and, when phantom power is applied, the variable pad pot is extremely scratchy. With phantom power off, all is well with the world. Is this a known...

Hi Joe I have built the controller along with the tascam breakout pcb and I am not getting any sound out at all. I suspect the issue lies in the ICB connections on the 26 wire ribbon cable and I am in the process of getting more connectors for this. Can you please confirm that I have the dual 10k p...

So I just came back to my bench to do some more testing and now everything is fine. I put it back together and all the voltages are correct. I have absolutely no idea why but I guess as long as its working.... From your other posts it will be a opto or other component leg under the sidechain pcb to...

Hi. Just curious if there is a way to incorporate a mono sum switch when using two amps, not in bridge mode? I'm building a stereo amp to run a pair of Grover Notting CR1 speakers in my studio, and it would be great to quickly flick a switch to check it in mono. thanks! Matt HI Matt Yes if you link...

Is it possible I damaged a component with the soldering iron / heat when removing / installing the optos? I was careful but was quite fiddly and the angles for access were not great. I can see solder across linking 2 solder pads on the opto LDR end which is not a good idea it could short things as ...

Sorry, Yes, both makeup and threshhold pots are bot fully anticlockwise. Yes the ribbon cables are connected correctly. Ok it makes no sense as 2 x 200k threshold pot in parallel with and 100k resistor make a 50k load which drops the input signal -6dB. And the makeup pot with output amp will add 6d...

Hi Joe Photos https://www.dropbox.com/sh/ewc0cxfvg8nfjvi/AABRxLw7a1aU5sZj69ilIT93a?dl=0 Obviously, it was not easy to remove/install optos without removing the board (soldered to switches) so positioning is not the best but I believe they are installed correctly. Something else I have noticed just ...

I am having an issue with on of my LA500A units. I built my first LA500A several years ago and it has been great. Absolutely love it so I decided to buy a second one so I can have a linked pair (with a matched opto set) but now I am having trouble with the old unit I am using a JLM 500 extension ca...

Hello and thank you in advance for the clarity of answers and schematics in the thread. I am planning to build a VU meter using your circuit with Sifam Al29 VU meters. I have already incorporated the diode and resistor modifications of the circuit for the AC meters as well as a DPDT switch and extr...

Thanks Joe, successfully installed my box in studio yesterday. After a few balanced to unbalanced wiring cock ups it works a treat! I'd read the IDC connector pin out as 1 = Shield 2 =Hot 3 =Cold 3 etc.. But it's 1 = Shield 2= COLD 3=hot so the unbalanced console SND and RTNs didn't work.. Cool gre...

Hi there, I just purchased some Palpigrade kits. I'm going to be leveraging the LME49720NA and adding them to a summing mixer that's running on +-24VDC. What zener diodes should I leverage to bump down the +-24VDC? Sorry I'm new to adding in zeners. Thanks for the help! Ok LME49720 is max +/-17vdc ...

Hi Joe I'm running over issue like L/R going on same Out ( A-Left or B-Left). Mode Switch doesn't make a change. try to debug, but I have a doubt which can help me put side things step by step and figure where it from. Does the rotary Alpha switch have to be fit/flip on a particular way ? Side to t...

Hi Guys. I had a great time on the weekend building this kit. All up it took me about 5 hours (I'm a pretty slow worker!) But it worked out perfectly, I'm yet to properly put it through its paces though ;) The only real challenge in the build - and I just wanted to post this here to possibly help s...

Mattsoniclab wrote: ↑

Thu Jul 02, 2020 6:31 pm

Hi there.
Some advice please.
Would this transformer be suitable for two amp kits?:

https://nz.rs-online.com/web/p/toroidal ... s/1234025/

thanks!
Matt

Hi Matt Yes that transformer is perfect for 2 amps not running in bridge mode.