the_equalizer
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Wonderful! It looks like you did a really clean work in that perfboard. Really nice!
Greetings all,
After years of being frustrated that I can't use my AKG240's with my iPod/iPhone (or really anything else I have), I have decided to quit whining and build something... I think the Starving Student is going to fit the bill acoustically, aesthetically and most important, financially. I have a couple of questions though...
I'm going to confess up front that I haven't read all 400+ pages of this thread, so please excuse me if the following questions have been previously answered.
1) I want to use a different type of heatsink for the mosfets... will just about any heatsink work (as long as the mosfet is properly mounted to it) or are there some types to avoid?
2) I also want to use a rotary on/off switch. Will any ol' switch do (as long as it meets or exceeds the specs of the switch from the BOM)? Would someone be willing to suggest an appropriate switch?
This will be my first foray into diy amplifiers so I'm a bit nervous about the project. Are there any good EE for Dummies type books I could pick up?
Thanks in advance!
Yes any heatsink of sufficient size will work, if you want you can mount the mosfets to one large one as I did in my build, be sure to get the mounting kits or I just get the thermalsil (Search that in mouser) pads and some nylon screws and nuts, you want them to be isolated. Then you can ground the heatsink for extra noise reduction.
Any switch will work as long as it can handle the current, which really isn't much. I've used the volume pots that have a switch built in to kill two birds with one stone.
Greetings all,
I'm looking into building the 12au7 version as an option if I can't find any 19j6 tubes. I've been reading over the schematic for that mod: http://www.diyforums.org/SSMH/variants/SSMH-12AU7.gif
My question relates to the highlighted changes... Where the changes are alongside another (i.e. original design component), is the highlighted option to be used in addition to the original or in place of the original? I know that's a rank, noobie question but I wanted to be clear before I started putting together a BOM/shopping list.
Also, are there any good basic electronics resources in print (or electronic) that I should take a read of before I warm up the soldering iron?
Thanks again!
Greetings all,
I'm looking into building the 12au7 version as an option if I can't find any 19j6 tubes. I've been reading over the schematic for that mod: http://www.diyforums.org/SSMH/variants/SSMH-12AU7.gif
My question relates to the highlighted changes... Where the changes are alongside another (i.e. original design component), is the highlighted option to be used in addition to the original or in place of the original? I know that's a rank, noobie question but I wanted to be clear before I started putting together a BOM/shopping list.
Also, are there any good basic electronics resources in print (or electronic) that I should take a read of before I warm up the soldering iron?
Thanks again!
I'm not sure what exactly do you refer to when you say 'alongside another' but if you're talking about, for example, C1 and C6, where there's a value crossed with a line and another value non-crossed value next to that, then they're not to be used in addition to but in place of the original (the crossed number).
So for C1 and C6 the original schematic specified 150uF electrolitic capactitors where the modified version uses 680uF caps @ 63 volts.
To also clarify another potentially confusing issue, parts highlighted in yellow are optional, you can leave them out if you so wish. If you DO leave them out R14, R15, R16, R17 must be substituted by a wire connection; whereas C3a, C5a, C7 and C8 need nothing of the sort, you just don't connect them.
Oh, and certainly anything you can read on introductory electricity and/or electronics helps. I wish I could give you some URLs but I really don't know any. Google is your friend or maybe others could chime in here.
Hope this helps.
Ok... where do you wire in the tube illumination leds and resistor?
http://www.diyforums.org/SSMH/variants/SSMH-12AU7.gif