Search found 1641 matches

by Joe Malone
Wed Aug 05, 2020 10:57 am
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 170
Views: 140918

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

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 ;)
by Joe Malone
Wed Jul 29, 2020 10:34 am
Forum: JLM Audio Kits
Topic: Go Between and Go Between Plus kit BUILD THREAD
Replies: 33
Views: 52269

Re: Go Between and Go Between Plus kit BUILD THREAD

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...
by Joe Malone
Wed Jul 22, 2020 1:02 pm
Forum: JLM Audio Kits
Topic: Passive Controller Build Thread Ver 1 & 2
Replies: 47
Views: 31830

Re: Passive Controller Build Thread Ver 1 & 2

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...
by Joe Malone
Fri Jul 17, 2020 5:25 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 170
Views: 140918

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

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...
by Joe Malone
Thu Jul 16, 2020 4:15 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 306505

Re: JLM 60Watt Power AMP Kit

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...
by Joe Malone
Thu Jul 16, 2020 4:12 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 170
Views: 140918

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

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 ...
by Joe Malone
Thu Jul 16, 2020 1:38 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 170
Views: 140918

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

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...
by Joe Malone
Thu Jul 16, 2020 12:31 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 170
Views: 140918

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

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 ...
by Joe Malone
Thu Jul 16, 2020 12:06 pm
Forum: JLM Audio Kits
Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
Replies: 170
Views: 140918

Re: LA500A opto comp leveling amp BUILD THREAD 500/51X

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...
by Joe Malone
Wed Jul 08, 2020 7:51 pm
Forum: JLM Audio Kits
Topic: VU BUFFER KIT BUILD THREAD
Replies: 66
Views: 135904

Re: VU BUFFER KIT BUILD THREAD

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...
by Joe Malone
Tue Jul 07, 2020 10:30 am
Forum: JLM Audio Kits
Topic: 8 Channel Relay Switch Build Thread
Replies: 18
Views: 11516

Re: 8 Channel Relay Switch Build Thread

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...
by Joe Malone
Mon Jul 06, 2020 1:08 pm
Forum: JLM Audio Kits
Topic: Palpigrade Build Thread
Replies: 2
Views: 3180

Re: Palpigrade Build Thread

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 ...
by Joe Malone
Fri Jul 03, 2020 11:36 pm
Forum: JLM Audio Kits
Topic: Passive Controller Build Thread Ver 1 & 2
Replies: 47
Views: 31830

Re: Passive Controller Build Thread Ver 1 & 2

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...
by Joe Malone
Thu Jul 02, 2020 9:08 pm
Forum: JLM Audio Kits
Topic: BA500 Mic Pre Amp BUILD THREAD 500/51X
Replies: 70
Views: 96875

Re: BA500 Mic Pre Amp BUILD THREAD 500/51X

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...
by Joe Malone
Thu Jul 02, 2020 8:54 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 255
Views: 306505

Re: JLM 60Watt Power AMP Kit

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.