Magura Napisano April 28, 2009 Share #1 Napisano April 28, 2009 So, here is a little something.This project has been ongoing for 8 years by now, and for some strange reason it's about to come to an end.The electronic part is the result of a collaboration between Zen Mod and yours truly.The box is the result of my need to escape the reality from time to time First a schematic:Magura Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano April 28, 2009 Share #2 Napisano April 28, 2009 just keep them coming Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 28, 2009 Autor Share #3 Napisano April 28, 2009 One of the latest steps: A machined PCB. Initial layout by Spavleski, trimmed to snuff by yours truly.Magura Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 28, 2009 Autor Share #4 Napisano April 28, 2009 Which has been populated by now.Some of the components will look familiar to the members from behind the ex-iron curtain.Magura Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano April 28, 2009 Share #5 Napisano April 28, 2009 Greetings Magura,please tell what's the voltage on cascode MOSFETs' drains, and what's the "BIG DONUT" choke ?If those 47R/1W resistors see voltage close to +20V there will be a lot of smoke, but who cares, it's smoke induced circuit anyway Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano April 28, 2009 Share #6 Napisano April 28, 2009 Greetings Magura,please tell what's the voltage on cascode MOSFETs' drains, and what's the "BIG DONUT" choke ?If those 47R/1W resistors see voltage close to +20V there will be a lot of smoke, but who cares, it's smoke induced circuit anyway those 47R are there just for fun ...... intended for deflorating the amp , during first full throttle test Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano April 28, 2009 Share #7 Napisano April 28, 2009 those 47R are there just for fun ...... intended for deflorating the amp , during first full throttle test To deflower it, first it has to resemble the flower - this one you can only debug Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 28, 2009 Autor Share #8 Napisano April 28, 2009 what's the "BIG DONUT" choke ?The "big donut" is a 2 x 90mH air core choke. The "big" part of "big donut" , refers to its physical size. Approximately 350mm diameter, and 120mm tall. Some 20kg of copper Magura Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano April 29, 2009 Share #9 Napisano April 29, 2009 The "big donut" is a 2 x 90mH air core choke. The "big" part of "big donut" , refers to its physical size. Approximately 350mm diameter, and 120mm tall. Some 20kg of copper Magura WOW ! You must have inherited a copper mine!Really impressive!I thought you'll use some toroid transformer's center taped secondary - this way, with air core inductor, it will hardly find a way to average DIYer's heart Nevertheless, keep up the good work and please keep us informed on progress! Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #10 Napisano April 29, 2009 WOW ! You must have inherited a copper mine!Really impressive!I thought you'll use some toroid transformer's center taped secondary - this way, with air core inductor, it will hardly find a way to average DIYer's heart Nevertheless, keep up the good work and please keep us informed on progress! If only I had inherited a copper mine That would have made this a little less daunting to the bank account Actually, I am just an average DIY'er, but have spent a little more time than most are willing to. This construction is really not that much more expensive, than what you frequently see people build. I just have put the money where I thought it is important, and haven't spent them on silver capacitors and fancy wire.Magura Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #11 Napisano April 29, 2009 Here you can see one of the more fancy solutions. A shielded inductor, for the CLC filter.To make a shielded air-core inductor is not as simple as it may seem. It requires a balance of ferro-magnetic and non magnetic shielding material, to leave the inductance unchanged, and not get in trouble with saturation. This I got around, by making a "cup" of ferritic stainless steel, and a base that doubles as a heat-sink, of copper.To get the heat transfered to the copper base, I have potted the whole thing.Magura Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano April 29, 2009 Share #12 Napisano April 29, 2009 ...Actually, I am just an average DIY'er, but have spent a little more time than most are willing to...Absolutely true, but then again, your dedication to detail, especially in mechanical domain, is well known I would rather unload the truck of bricks than wind a 90 mH air core coil - don't know why but I'm really reluctant when it comes to coils (maybe because I worked many years with short-wave transmitters) and that makes your work even more impressive in my eyes. Your fancy coils I won't even comment Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano April 29, 2009 Share #13 Napisano April 29, 2009 .....I would rather unload the truck of bricks than wind a 90 mH air core coil - ....it's easy when you are winding them on lathe (or milling gadget) , not sissy winding machine and - especially - when your woman is , in fact , winding those coils ..... while you are sitting Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano April 29, 2009 Share #14 Napisano April 29, 2009 it's easy when you are winding them on lathe (or milling gadget) , not sissy winding machine and - especially - when your woman is , in fact , winding those coils ..... while you are sitting That's the way to do it: - You want equal rights honey? - Good, how about some thick wire coils? Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #15 Napisano April 29, 2009 I would rather unload the truck of bricks than wind a 90 mH air core coil - don't know why but I'm really reluctant when it comes to coils (maybe because I worked many years with short-wave transmitters) and that makes your work even more impressive in my eyes. Your fancy coils I won't even comment If I had the choice, I'd too take unloading a truck, rather than winding those coils, any day Nasty type of work if you ask me.Then you should also know how nice coils are (once made that is), I for one have had some very nice experiences with inductors, and as the copper price has gone down a bit, they're not even all that expensive anymore.As Zen Mod says, I used a lathe for winding them, but to tell you the truth, it didn't make much of a difference to how sore you get -And no, we don't have that much equal rights here, that I get inductors served for a hug and a kiss Magura Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #16 Napisano April 29, 2009 it's easy when you are winding them on lathe (or milling gadget) , not sissy winding machine Difference mainly being, that a lathe does not hit the max weight limit Magura Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano April 29, 2009 Share #17 Napisano April 29, 2009 .....in any case - send my kisses to your avatar Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #18 Napisano April 29, 2009 in any case - send my kisses to your avatar Will do Here is the finished shielded inductor. 5mH, good for 20A.Magura Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano April 29, 2009 Share #19 Napisano April 29, 2009 Will do Here is the finished shielded inductor. 5mH, good for 20A.Magura when finished - I wanna all these pics , each one no smaller than 1MB Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #20 Napisano April 29, 2009 when finished - I wanna all these pics , each one no smaller than 1MB I'll make a folder, and save the pics then. It's also getting more interesting now, as it's not just a bunch of funny looking parts. Now it's actually possible to tell they have a purpose (sort of).Magura Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #21 Napisano April 29, 2009 To be able to control the orientation of the heat-sinks, I had to make precision bolts for mounting them. To make it look like I had a bit of integrity, I chose to make the nuts for this as well.Making 1 is ok Magura Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano April 29, 2009 Autor Share #22 Napisano April 29, 2009 Making 50 is somewhat less fun Magura Link to comment Podeli na ovim sajtovima More sharing options...
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