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Messages - bassetrox
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1
« on: June 27, 2012, 05:02:25 AM »
Thanks a lot KMG, comparing your to mine, I cant see what I was doing wrong :s No worries anyway. Have you tried any dual rail designs with complimentary pairs of lateral FETs into a tx? bassetrox, you can use LTspice simulation files from there
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/sim/
2
« on: June 20, 2012, 08:56:26 AM »
Hi KMG, once again, great work,
and thanks for sharing so liberally.
I've been trying to simulate your 5W PA design to help me better understand it, but I can't get more than a couple of millivolts clean signal. Any idea what I'm doing wrong? I haven't got much experience simulating fets with tx.
3
« on: June 18, 2012, 10:41:44 AM »
Yeah, that's what my research turned up. The only lateral mosfets I can track down the are the exicon models from profusion. If anyone has any other suggestions I'd be interested! bassetrox, it`s very bad news
I don`t find any replacement for them.
Do you think you could get similar results using vertical mosfets? Vertical mosfets has several disadvantages - positive temperature coefficient (needs temperature compensation) & high transfer ratio.
4
« on: June 12, 2012, 05:47:04 AM »
ok i recently bought an used g100 solid state yamaha amp and the power amp or power supply unit got chard from connecting it to a 220 volt outlet, can somebody tell me what is the correct power amp for this amp, i need to buy one and the technician does not know which one to get......
thanks edwin
Do you need a schem? Think i have one at home. EDIT: PM if so.
5
« on: June 11, 2012, 11:33:16 AM »
The majority of amp problems (in fact all electronics problems) are due to dirty or corroded connections, and since this amp has been in storage for a long time, this is most likely what is wrong (unless of course rodents have eaten the speaker); it's a matter of finding what should be connected that now isn't, and the speaker plug and socket are a natural suspect.
HTH
Company i used to work for had a 'faulty' subwoofer returned. Turned out the escaped family hamster had made a nest in there. he'd dragged in some chocolate wrappers, bit of newspaper and left plenty of less savoury things before finding the wiring tasty. Then presumably absconded (alive) before or during the returns process.
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« on: June 11, 2012, 11:03:39 AM »
Course it can. I had a browse around your website. The FET poweramps with op tx sound great too. Do you think you could get similar results using vertical mosfets? The 2SK216s seem to be obsolete and from what I can tell there aren't that many lateral power mosfets around. Current consumption can be simply calculated from schematic using voltage drop on R30.
(340V - 290V) / 10K = 5mA.
7
« on: June 06, 2012, 06:47:16 AM »
Hi KMG and everyone,
The sound clips sound great, excellent project!!
How much current does the LND150 circuit draw? Without sitting down and working it out, I presume the valve pre would draw maybe 20-30mA max from the HT rails, how much does the SS version draw? I've got a couple of HT tiny torroids I could run in parallel, but they're only 25mA each.
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