Hi all I'm looking to build the following circuit:http://www.instructables.com/id/In-line-headphone-amplifier/ and it requires a MAX9725 IC i cant for the life of me find anywhere that stocks it! rs dont have it, nor do farnell or rapid! does anyone know any other alternatives to this ic? with thanks
Maxim parts hard to get ahold of? no way Can you get a sample direct from maxim? I'm not sure if they deliver to the UK. You would be hardpressed to find a pin for pin replacement due the the unique nature of it. Not without significant modification of the circuit... Maxim is good for that, amazing chips that are obscenely tiny and hard to get ahold of from stockhouses.
i can handle the small size, thats not a problem. i've requested some samples from them but nothing. i'm going to see if i can find a US supplier of them and see if i can get it shipped to someone in the states and pay them a little something to post it on for me. the search continues!
http://www.maxim-ic.com/quick_view2.cfm?t=or&qv_pk=4523 Well, looking at the product page, they offer samples, but of awkward to use packages. You have your choice of a solder ball array, or a "thin" form factor which will likely be hard to solder. Since they won't send them to you directly, if you can figure how much shipping from the states would be and cover it, I'd gladly request some samples and then forward them your way. You can also try emailing them. I've tried for Bulgin Vandal switch samples and have legitimate intentions for them, but never get answered probably due to my location.
hey well the samples themselves are free of charge and i've already requested those, not heard anything back yet they do seem to sell them though https://shop.maxim-ic.com/storefront/addtoshoppingcart.do?Device=MAX9725DETC+&rownum=1 well, shipping shouldnt be too much, although im willing to pay up to 10$ in shipping alone from you to me and the 10$ that maxim will charge to ship to you, as long as i can get the IC's!
Have you checked to see if Fairchild or TI or National, or any of the other semiconductor distributors manufacturer a similar chip?
hi i'm looking at TI at the moment and there appear to be a fair few headphone amplifier IC's, do you have much expertise in 'reading' circuits?! the particular 'application' i have is to make a headphone amplifier which i can adjust the output volume on. if you can help me with this, i will send you a couple of bulgin vandal resist switches and a headphone amp free of charge! how does that sound?!
http://focus.ti.com/lit/ds/symlink/tpa6111a2.pdf this IC seems to be perfect, but i wouldnt know how to go from the data sheet to a fully fledged mini amp! any help anyone?
I'm not sure to what extent I can help you, but I do know that the TI chip you linked to won't work with the exact circuit as described via the instructables link. The Maxim chip is a very low voltage chip while the TI one will require a larger power source. The easiest way to go from data sheet to full circuit is to find a similar circuit and build off of it. I found quite a few sites described how to make a headphone amp using Op-Amps. http://tangentsoft.net/audio/cmoy-tutorial/ Above is one of the better tutorials that I found, based off of the CMOY design which is very widely used and adapted and originated here: http://headwize.com/projects/showfile.php?file=cmoy2_prj.htm . The first link I gave you gives a few vendor part #s, and aside from maybe the op-amp, they should be readily available anywhere.
If youre going to be using a CMOY I would consider using a 'normal' opamp. Searching around you should be able to find plenty of info by searching google about which opamps make the best sounding headphone amps. The TI chip requires input and output caps so you might as well make a CMOY.
Re: Hi, I recently came across a site called http://www.datasheetpro.com/ it will provide you with a product description and picture (for hardware), feature list, specifications, and ordering information. Hope this will help you. Good luck!
