Search found 20 matches

by glbaudio
Wed Dec 26, 2012 11:38 am
Forum: JLM Audio Kits
Topic: dINgO Pup kit BUILD THREAD
Replies: 72
Views: 78857

Re: dINgO Pup PCB and kit now available

Is possible to power this circuit with a single 24V power rail? Or better, with a 0-12-24V dual rail (centre is 12V) I've already realized a rail to rail converter and now I have a +24 +12 and 0V with an Opamp from a single 24V, consider i have to balance/unbalance an audio circuit working with two ...
by glbaudio
Mon Aug 27, 2012 8:18 am
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

about the tiny difference between ON and standby...do you think is useful compensate it? thanks a lot for your help! Not really as with a output transformer the difference will change a bit depending on the input impedance of the next bit of gear in the chain. But you could fit a 50k 25 turn trim p...
by glbaudio
Mon Aug 27, 2012 7:40 am
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

Joe Malone wrote:With the MAC plugged in the level should drop 6dB. Change R16 to 30k to makeup the 6dB lost by the 1:1.

great.
about the tiny difference between ON and standby...do you think is useful compensate it?
thanks a lot for your help!
by glbaudio
Mon Aug 27, 2012 12:39 am
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

wired as this the second unit too, the value are the same
by glbaudio
Sun Aug 26, 2012 10:55 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

To wire the LL1539 transformer as 1:1 Wire pins 2,4,5 to +P Wire pins 1,3,6 to -p Wire pin 8 to +S Wire pin 12 to -S Join pin 7 to 11 Let me know what values you have fitted for Makeup pot 10k or 20k rev log pot? R25? (should be 100k) R16? R13? And I will work out how to get unity with the 1:1 tran...
by glbaudio
Sun Aug 26, 2012 10:48 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

To wire the LL1539 transformer as 1:1 Wire pins 2,4,5 to +P Wire pins 1,3,6 to -p Wire pin 8 to +S Wire pin 12 to -S Join pin 7 to 11 Let me know what values you have fitted for Makeup pot 10k or 20k rev log pot? R25? (should be 100k) R16? R13? And I will work out how to get unity with the 1:1 tran...
by glbaudio
Sat Aug 25, 2012 10:45 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

well, i've reconnected one unit with the last parameters, it work (the trimming is now performing as analog values too), the only think I don't like is i have a loss of signal when not in bypass (1,40 Vpp in bypass, 1,04Vpp on ON with no compression), i think this is because the configuration (unusu...
by glbaudio
Sat Aug 25, 2012 3:19 am
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

With no output transformer and a DOA opamp there is nothing to drive the -out so you should get no signal on -out (you are just getting in phase resistive blend on there at the moment). -O should be linked to -P to 0v ground it to make the output run as quasi balanced (signal on +out and noise canc...
by glbaudio
Fri Aug 24, 2012 9:28 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

With no output transformer and a DOA opamp there is nothing to drive the -out so you should get no signal on -out (you are just getting in phase resistive blend on there at the moment). -O should be linked to -P to 0v ground it to make the output run as quasi balanced (signal on +out and noise canc...
by glbaudio
Fri Aug 24, 2012 8:55 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

With no output transformer and a DOA opamp there is nothing to drive the -out so you should get no signal on -out (you are just getting in phase resistive blend on there at the moment). -O should be linked to -P to 0v ground it to make the output run as quasi balanced (signal on +out and noise canc...
by glbaudio
Fri Aug 24, 2012 8:17 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

If you are using a output transformer it is floating so you cannot measure +out to 0v or -out to 0v as they will be be floating at any offset. Unless you fit 2 x 470R resistor to reference the 2 outs to 0v (1 resistor from +out to 0v and the other from -out to 0v) Best way to test is below You need...
by glbaudio
Thu Aug 23, 2012 10:43 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

Ok something is shorted or wired wrong then. You can make a test plug for the JLMIO port so you can test the INX5 PCB by itself without the MAC PCB. make a Test plug for JLMIO port. Link pin 1 to pin 5 (links the unblanced out to the unbalanced in to loop the audio.) Link pin 3 to pin 8 with a 2k7 ...
by glbaudio
Sat Aug 11, 2012 11:23 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

I'm working on a couple of Mac + INX5 with a Lundahl LL1539 (wired as 1:1) and a 2520 DOA clone on output... ok I'm watching about the differences between the INX5 and the LA500... - i see in the LA500 R4 in an half of R3 (as R6 is an half of R5), this means that the gain of the input stage is an h...
by glbaudio
Sat Aug 11, 2012 7:45 pm
Forum: JLM Audio Kits
Topic: INX5 BUILD THREAD
Replies: 43
Views: 63859

Re: INX5 BUILD THREAD

I'm working on a couple of Mac + INX5 with a Lundahl LL1539 (wired as 1:1) and a 2520 DOA clone on output... I'm watching about the differences between the INX5 and the LA500... - i see in the LA500 R4 in an half of R3 (as R6 is an half of R5), this means that the gain of the input stage is an half ...
by glbaudio
Sat Jul 28, 2012 7:57 am
Forum: JLM Audio Kits
Topic: MAC RACK KIT with Green MAC & DINGO PCBs Build Thread
Replies: 62
Views: 89503

Re: MAC Build Thread

HI glbaudio I had a look at the photos you sent. Did you actually reverse the +/- power as the 100uF caps wouldn’t have bulged unless it had more than 25v across it or reversed voltage? I can sell you some caps to fix easy but you should be fine to run the PCB’s the way they are for now to see if a...

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