AGTCooke, if you are considering doing more surface mount soldering you may want to take a look at using solder paste and a hotplate. This page has quite a good guide to hotplate soldering. Its also possible to use a skillet, Sparkfun have a pretty good tutorial on how to do it as well.

Well, I reached my limit today. Nearly 23 months and no amp. Xin's own "Currently Shipping" post is 8 months out of date, and $300 out of pocket. I emailed Xin and requested that my order be canceled and to be refunded. I fully expected to need to wait a week or more before I heard...

...board has V3.0 on it, the schematic I uploaded is V3.3. I made quite a few stuff ups on that first version. Some changes from the V3.0 to V3.3: * Fixed the picaxe programming circuit * Added in the output switching relays (yes I managed to forget to include them) * Changed the circuit...

...There is a Lite (Free) version which is usable for most things, it does have restrictions however: The useable board area is limited to 100*x*80*mm (4*x*3.2*inches). Only two signal layers can be used (Top and Bottom).The schematic editor can only create one sheet. CadSoft Online: EAGLE...

I'll likely get some time to put the files together over the weekend, so hopefully I'll have something for you guys after that. I'll try to update things as well to reflect the additional changes I made during the build. I'll try to include stuff like part numbers for the case, switches, knob...

...with stuff I have made years ago, when it eventually fails and I open the case I find myself wondering "What the hell was I thinking when I did *that*?!" Hopefully keeping everything inside the amp will prevent that from happening later on down the track I have no idea how much its cost...

Thanks guys Just don't look under the control board, its a mess with the modifications I had to make.

Well its finally done. The front panels arrived yesterday from FPE so I was able to fit them last night. I went with dual colour Bulgin momentary switches for the mode buttons. Blue Green The control of the amp is done using a Picaxe18+driver chip to handle the LEDs as well as the...

SilverShadow, I recommend making your desktop background a photo looking out your window, taken from where you sit. Make it look like your monitor is see through

Agreed, the Arduino is probably the best way to go. In fact I have already done something like this myself. The voltage from the Sigma22 goes into a voltage divider -> opamp so both rails can be measured. (the arduino can only measure between 0 and +5V)

Primarily the picaxe handles the power switching with some added bells and whistles. In its simplest form it allows you to use a momentary push button to toggle the power on and off. But because of the additional inputs and logic also allows you to do some more interesting stuff. If you...

As requested, a closeup of the FETS mounted on the heatsink As you can see I cut away a section of the heatsink. This helps the fins of the heatsink line up with the vents in the bottom of the case. And also a closeup of the picaxe controller The four six pin chips near the front are...

Quote: Originally Posted by johnwmclean Is a headphone/speaker design? Keep em coming Never heard of this, like to hear more about the pros and cons regarding this feature - never seen any on other builds. Primarily headphone, but I like to leave my options open The is...

Yup, thats the glass jar kit, makes things so much easier (Thanks Jeff!) I have cut notches into the heatsink so I could have them mounted closer together. The vents in the bottom of the case now line up with the heatsink fins. I figure the way Perth summers get I need it to handle as much...

Hmm... lets try that again...

Just finished putting together the PSU for my Beta22 last night. Fully assembled Initial testing of the Sigma's, using an Ardiuno and LCD to track all four rails at once. Yes its heavily based on Naamanf's build

Coming up on 20 months here as well. Last time Xin updated his "Now Shipping" thread was back in January. I'm considering canceling my order again. *sigh*

Lets face it the world will go on, but mother nature doesn't give a crap about human beings. We can screw over the environment all we like, but our children and grandchildren are the ones who have to live in it. The earth is not a static system, there have been changes in the environment...

Bookmarked. I have a pair of K1000's still with stock cable. I been considering recabling them but from what I have heard they are a pain to work with. From the looks of your guide though it seems pretty straight-forward. Just need to figure out what I want to recable them with now.

Grats on getting on HackaDay Personally I've never worked with that PIC before (only worked with the PICAXE so far) but it looks like he may have given enough information to allow reverse engineering of the code.

This was something that I worked on for a while with mine. In the end I went with a picaxe08M controlling everything. I also feed back the + and - power rails on the Sigmas through optocouplers to the picaxe. If any power rail drops out it will flash an error code on the LED in the Bulgin switch.

Oh I'm not suggesting that he give up on the Beta22. Merely that he should try a smaller project first. Then once hes done that possibly go back to the Beta and see how he goes. So far the Beta has been a great learning experience, and I haven't even started building the amps yet :P I've...

Aman, I hate to say this (and I may be wrong of course) but I think you may have bitten off more than you can chew. The Beta22 and Sigma22 are in no way beginner "kits". Myself, I've been DIYing electronics stuff for more than 20 years and recently started building my own Beta22 based off...

Not long ago finished putting together my two Sigma22's. First one worked first time, second one I discovered I had gotten the 4 of the transistors swapped around. Only to blow up another transistor fixing those. /facepalm Once I sorted that out all worked. Haven't started on assembling...

The parts and boards for 4x Beta22 amps and 2x Sigma22 power supplies.