wires.co.uk : 9ct Gold Wire Massimo

Humblest apologies for reposting here this message. Hi everybody! I'm looking around for a USB or FW soundcard for around $200 with balanced and unbalanced line inputs and outputs to be used to test the performances of headphone and power amplifiers. From what I gathered on the net, the...

Hi Rob, I posted here because the topic seemed to me more related to DIY than to computer hardware. I was probably wrong... Thanks, Massimo

Skyskraper, unfortunately I need a USB or FW board. I have to use it with my laptop. Thanks anyway, Massimo

Hi everybody! I' looking around for a USB or FW soundcard for around $200 with balanced and unbalanced line inputs and outputs to be used to test the performances of headphone and power amplifiers. From what I gathered on the net, the M-Audio Fast Track Pro...

Quote: Apparently yes, but I guess in a single point... Why did you do that? the original pcb did not use a ground... Sorry Marios, when I quickly looked at the pcb I didn't notice the ground plane... nor the other thread... Massimo (very inattentive reader)

Quote: Do you think that placing the transformer near the amp could cause problems? In general, the tranformer should not be very near the amp, especially if the amp is a high-gain low-noise amp like a RIAA preamp. If you use a toroidal transformer (leaking little magnetic flux)...

Quote: The transistors (two of them) I had put the wrong way in both channels. Now I turned them around but still no sound. This could explain both channels silent. Quote: Thats wjy i suspect something got burnt. Could this have caused the other transistors that were ok placed...

Hi Marios, as you know I didn't build the circuit yet, so I can only provide generic advice. First of all, get a multimeter, possibly including a transistor tester. Quote: I dont get ANY sound at all on both channels? If you don't get sound on both channels, you should firstly check...

Hi Jeffrey, thanks very much for your kind answer. Quote: The strength of a magnetic field is directly proportional to the current flowing through the wire. Given that basic fact of physics, there's no reason why the rectifiers should produce a stronger magnetic field than the traces...

Hi Jeffrey, Thanks for the very interesting posts! May I ask a couple of things about the "lost flux" problem? First is about the toroid. Is the flux leakage related to the "exit point", not to the "exiting wires", isn't it? In both cases, would it be useful to twist the wires together...

Thanks very much for your comments and for your kind explanation. Ciao, Massimo

Hi Peranders, Quote: Mario, check the datasheet of LT1115 May I ask what do you think of this schematics as well as of the LT1115 chip? Does the LT1010 really need the cap on the output? Do you think the PS could be a basic one (rectifier and caps) or a more complex PS would be...

Hi Marios, there are quite a few phono stage projects on the Tnt site: http://www.tnt-audio.com/clinica/solidstate.html I want to build the InDiscreet, sooner or later so, for the moment, I cannot comment on its sound. RIAA: I'm pretty sure that all the phono stages around conform to...

Quote: Thanks for the advice, antomas Hope it may be right.... anyway, from some previous posts, it seems that the transistors are not so bad. Maybe the weirdest components to match could be the LEDs. Quote: For the power supply I got some 0.1% Holcos. These are magnetic (the...

Hi Jupiter, sorry for answering so late. I'm not an EE and I didn't build the amp yet (thanks to the italian posts and customs - grrrr!), but, from my understanding of the circuit, I would match the 2SA1015 with the 2SC1815 of the first stage and then the 2SA1015 with the 2SC1815 of the...

Sorry David, I don't have very much to show for the moment, but: I'll use a 4 pole/5-6 toggle rotary switch to switch signal and ground of both channels. One side of the switch will be connected to the (insulated) input rca jacks and the other side to the 50 kOhm Alps Blue. No tape out...

Hi BoyElroy! Thanks for your message and... my apologies for this very concise reply. Quote: Now that you've got the PSU ready, I was wondering how you were going to make the amp section. Will you draw up your own custom design or use an existing amp board? Single-ended or balanced...

Dear David, it's a pity we are so far away and I can't invite you for a drink (maybe, better, for having some italian food...) My best wishes for your projects and again, thanks for the bug fix. I didn't read carefully the datasheet of the OPA548 but a kind man found the problem... Massimo

Hi David, I realized that my (understanding of) english is worse than I could imagine... Sorry for my confused reply and thanks once again for your help. Best regards, Massimo P.S. to better clarify the reason of my misunderstanding, for a while I suspected I had swapped the pins of...

Hi Arzela, thanks very much for your comments! Quote: Should all three connections for your trimmers be connected? They should be used as a variable resistor (from wiper to one end), no? I'm not sure to have correctly understood your question (apologies in case I didn't... ). I...

Hi everybody! You may find my attempt to design a pcb for the power supply of Gilmore dynamic amp here. ExpressPCB and image files will be posted as soon as i'll build the ps (hopefully 7-10 days). Thanks for your attention, Massimo

Just an idea: could it be that the 16V mentioned in the Headwize paper are instead the 16,4V from the power supply? Ciao, Massimo

Absolutely delicious! How thick are the aluminium panels? Massimo

Thanks a lot!