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Registered Member #2633
Joined: Sun Jan 17 2010, 06:25PM
Location:
Posts: 3
I have begun construction of the miniBrute via kit from EVR!
I am just finishing up soldering up all the boards, and I have a few pretty elementary questions.
Capacitor identification: I still have yet to install the following 7 caps:
C2 - (line 22) part # BC1089CT-ND : 1000pf,50v C21 / C82 / C85 (line 24) part # 445-2647-ND : 1uf,50V C22 / C32 (line 25) part # BC1013CT-ND : 100pf,50v C30 (line 26) part # BC1001CT-ND : 10pf,50v
And I am currently left with the following 7 caps but am having a hard time determining which is which:
3 "dipped blob" style ceramics with the markings "105 ESM" on one side and "818 RAT" on the other. Based on conventional markings I am thinking these are the three 1uf (line item 24) for C21,C82,C85.
However, I am also left with: 3 capacitors that are in the small rectilinear block style package. 2 of these have the marking "M390 14/01 1219" on one side and "JAVX 9524 014(or B14)" on the other. 1 of these has the marking "M390 14/01 1317" on one side and "JK 0705 C" on the other.
Additionally I have one tiny blob-style cap with the marking "BC 10J" or "8C 10J" ...hard to read. I suspect this is the 10pf for C30 (line item 26).
Can anyone help me confirm/identify these caps?
IC Sockets: Also...my parts via EVR came with only 2 IC sockets. These are 8 pin sockets. Based on posts in this thread, it seems I should use these for gate drivers U4/U5 as these seem to be IC other have blown. Anyone have any thoughts on this?
IGBT orientation. I am using the IXYS IXGN... IGBT One mounting hole is circular, and the other is a u-shaped notch. I read elsewhere in this thread the notched side is the emitter side. Can someone confirm this?
Registered Member #3212
Joined: Sat Sept 18 2010, 06:48PM
Location:
Posts: 4
Regarding the fan on the film caps... Honestly, caps are not designed for heat dissipation via air flow. Blowing on them doesn't really accomplish much due to the fact that heat dissipation within the cap is not going to be affected by airflow on the outer shell.. sorry, that's just physics... design for the rms (always best practice).
Registered Member #2845
Joined: Mon May 03 2010, 06:40AM
Location:
Posts: 12
I was confused about all the diodes and diode looking parts, but had pretty good luck just entering the numbers on them into google to figure out what they were(and learned lots about diodes and voltage suppressors in the process). I think doing the same with the capacitors would probably help you figure that part out. Wish I remembered more specifically which caps were which, but i dont right now. Cheers Ray
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Just got my minibrute books and board kit! I have a question: With a non modified copy of the design, and the primary circuit be tuned to around 190Khz? (I have a coil and toroid) also, Is anyone else building one at this time?
Registered Member #2633
Joined: Sun Jan 17 2010, 06:25PM
Location:
Posts: 3
Hi WilliamL, I am currently building mine too. I have about 70% of the mechanical done (hope to pretty much complete it this weekend), and about 80% of the electronic complete. Have you completed the soldering of your components? If so, maybe you can help me identify those last 7 caps I mentioned in my previous post, and also regarding the IGBT orientation.
Also..did your kit come with IC sockets for all the ICs, or just two 8 pin?
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Hi WilliamL, I am currently building mine too. I have about 70% of the mechanical done (hope to pretty much complete it this weekend), and about 80% of the electronic complete. Have you complete the soldering of your components? If so, maybe you can help me identify those last 7 caps I mentioned in my previous post, and also regarding the IGBT orientation.
Also..did your kit come with IC sockets for all the ICs, or just two 8 pin?
I only just ordered mine. Hopefully it comes soon so I can get building though! good luck.
But again, with a non modified copy of the design, can the primary circuit be tuned to around 190Khz?
Registered Member #1848
Joined: Sat Dec 06 2008, 03:24AM
Location:
Posts: 15
Folks.. I'm working through a minibrute build and have a couple of questions. Hopefully Dan or others can comment: - I'm fashioning the screen for the self-resonator board .. The book calls out using copper foil as the shield. Can I use copper screen instead ? Is this for electrostatic or magnetic shielding. - what do folks suggest I use for a clamp to use for tuning the primary ? Do people use an alligator clamp of some sort ? - is it really necessary to bring the top of the primary down through the base ? I have done so.. but the bends in the Cu tubing are not that beautiful. Would I be electrically OK to cut the Cu at the top of the primary ? Thanks ! -jc
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Just got my kit! One question: on the advanced modulator, which PW is the 1Meg pot supposed to go to? (R15) EDIT: resolved that, but now a new question: my boards arrived as one big pcb separated by many plated holes. any suggestions as to how to cut them apart? EDIT:Also resolved. Anyway, to anyone who has built (or designed) the advance modulator, can anyone help me with wiring up the switches and fire button?
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Minibrute Construction Thread / FAQs
