capacitors are made with different dielectrics for different aplications and cost, for example teflon for low leakage and tight tolerances and ceramic for cheapness.

when you said IC's I thought you ment intigegrated circuits! (Silver would be a very poor substrate due to it's lack of band gap precluding any semi conductivity) Also as you asked to be talked out of it all audio cables are placebo past the point where they are constructed corectly (no loose...

Microelectronic Circuits, Fifth edition by sedra and smith. Totaly sweet introduction to small signal and large signal models of BJT's, MOSFETS, JFETS and GAAS devices. Also some matirial on oscilation, filters and power amplifier topologies. Slight bent towards analog IC circuits (Dual emitter...

Probobly the best idea to use a timer of some sort as it's a sub amp so sometimes it will just sit there drawing minimal power and if the amp is turned on and off suddenly the thermistor is not usefull. I was planning on having a microcontroller in there anyway for volume controll.

I am building a power supply for a monster quadrophonic sub amp that has 60mF of rail capacitance a 640VA toroidal transformer. Can I get away with just using an NTC current limiter to limit the inrush and use a slow blow fuse or would something more elaborate be recomended?

have you considered using a regulated supply which would be smaller and offer greater performance at lower cost?

Hi I am having trouble understanding what kind of hole I need for these capacitors: http://www.rapidonline.com/netalogue/specs/11-3123e.pdf The datsheet seens to suggest a simple 2mm diameter hole, however whats with the strange shape of the pins? I have some of these capacitors and apart from...

Quote: Originally Posted by Juaquin Having "learnt about" amplifiers and designing high-end, stable audio amplifiers as a finished system are completely different beasts. It's not as simple as you seem to think it is. Sure, you can figure out a design based on theory (with quite a bit...

I am just finnishing my first year of EEE and this is rearly not that complicated, you have learnt about diffirential amplifiers, common collector/emitter amplifiers, various outputs stages and variations of all these with active loads. A complete audio amplifier is just aload of these strung...

All of them are rubbish contacts compared to something like a locking coax connector and connect the signal before ground.

if you insist on building your own then try and at least build something you can't buy for a good price, for example 10V - 400V adjustable (by switching transformers as the voltage ramps and using a floating regulator). Current and voltage display are esential as is adjustable current limit as...

generic capacitors are fine it's only audio frequancy stuff. If mains hum is an issue a regulated supply is in order, although people seem to be alergic to building decent regulated supplys for tube amps for some reason. As an ilustration why black gates are pointless regardless of spec...

Quote: Originally Posted by luvdunhill If you're aiming for +/- 25 VDC rails, what are you going to do with the extra heat that's generated from the approximate 10 VDC you have to drop after the rectifier? That's ~115W wasted power that the PSU has to handle before it can start to...

you misunderstand the amplifier is very ineffeciant due to operating in class A. The load is a 4ohm speaker. In an ideal case I would get from my +/-25V rails I would get 78.125W maximum transmited to my load however I only expect that I will be able to get within 5V of each rails without...

I am wondering if anyone knows where to get rear panel conectors capable of 20A per pin for connection of power supply to amplifier. Low cost is primary concern here as the amplifiers will be moved at most once or twice a year. My basic problem is I want to build a 50W class A speaker...

The truepath has a most strange power supply, seems madness not putting the whole lot on the same PCB. But going with a kit switching mode amplifier is defiantly the way to go in this case.

get a transformer in a mu metal can filled with epoxy for low noise.

my tube amp is only fully turned on after 2mins due to sequanced supplies and slow ramping up heaters and HT, it continues to warm up making alarming pinging noises for about 3mins. Mine is disapating about 60W per channel though in total so the entire case gets warm after about 10mins.

as somone using HD-650's in dorms I think they are a good choice. Mainly based on the oft overlooked aspect of headphone comfort and there low volume performance. If you are listening to headphones for 5+hrs a day they will not be at high volumes and a laid back sound is better as it's not as...

The capacitors should be fine if they are not buldging worst case they explode which is not too bad if you test each of them before using them in a circuit. Bin the resistors and low voltage capacitors as modern smaller better performance ones can be purchased for a few pence.

even the uber expensive EDA tools's can't layout something like a complete pc motherboard without weeks/months of manual tweaking.

wow holy thread revival batman!, thanks for the nice comments I am now a first year EEE student at imperial so I shall defiantly be carrying on designing circuits using JFETS. Anyway what I'm thinking of at the moment is an amplifier with no analogue amplification at all directly converting PCM...

Quote: Originally Posted by Zorlac My KECES DA-131.1 DAC has that chip, but no idea how I would attach a serial cable to it to read the registers. I'm really suprised that a company has not released some sort of dedicated product like I have described. It seems like a no brainer and...

Quote: Originally Posted by J.D.N Hows about some pics of your build I want to wait till all the problems are ironed out before posting pictures so wait about 1.5weeks.

ah right thanks... yeah they do have silver stuff on the top which I think is called the getter and used to absorb gases.... I guess the inside of the tube is @ 2000k when running and I wasn't thinking this through fully.