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Posted

Sorry typo. I meant the BJTs are getting hard to find.

 

For those using 115V, what's the max inrush current you have seen upon power on? I am trying to get a circuit breaker switch.

 

Also, can I use the 2sc2632 from Panasonic (http://www.classiccmp.org/rtellason/transdata/2sc2632.pdf) to replace the 2sc2705?

 

Edit: Nevermind I bought 20 2sc2705 from eBay just now. Hopefully it's not fake.

What's the difference between 2SC2240BL and 2SC2240GR, apart from the DC current gain, hfe?

Posted

Stunning boards.

Petite next to the older Lil Knight PCBs.

 

Indeed they are. Granted this one doesn't have the IXYS CCS option, but it's still impressive how much size has been shaven off (while adding the servo no less).

 

post-3922-0-21726500-1406039165_thumb.jp

Posted

Just so you know, there is an error on that board...  :)  The lower A970 is the wrong way around. 

 

Ohh and take care with that empty hole in the top center.  Very easy to make that go all arcy sparky. 

Posted

Thanks, I'll have to check which way I put them in when I get home. Guess it's a good thing I'm still waiting on the (2U/300mm depth/450mm width) enclosure for my new HV. Gonna be a tight fit (nothing like the tiny HV though), and hopefully nothing blows up.

Posted

I haven't fired one of these up yet so there might be more gremlins hiding somewhere.  It was a bit of a challenge to make it this small in the first place and then add the servo...  :-[

Posted

on that version of the board, the A970 and mpsw56 are labeled backwards.

The correct position is the a970's on the left and the mpsw56 on the right.

latest board had the silkscreen right, consult that for more info.

Posted

Yep, had to flip the lower A970s. The other A970s were already in the left position. Just to be sure, is 100V rating enough for the .1uf caps for the servo?

 

post-3922-0-55787100-1406064917_thumb.jp

Posted (edited)

 

If I read right, that listing is for 12 pieces and not just 1? That is dirt cheap going to buy a mini stash.

 

There are two versions of the 2SC2705 O and Y class, O has hfe 80-160 and Y is 120-240, does it matter either of which is used?

Edited by DefQon
Posted

Doesn't matter which 2705 you use. 

 

Yep, had to flip the lower A970s. The other A970s were already in the left position. Just to be sure, is 100V rating enough for the .1uf caps for the servo?

 

attachicon.gifP1080241s.jpg

 

Ahh so that's what those look like when the max height of any component isn't equal to the terminal blocks...  :)

Posted

I guess the lead spacing was made 3 times as wide as the one for the 0.1uF cap as it makes the tracing under the PCB easier.

 

Sorry for sounding dumb, but I asked because there's not much reason to make the lead spacing that wide for a low voltage cap, film/ceramic.

Posted (edited)

All of the film caps with a 15mm lead spacing have a 0.8 lead diameter, at least the ones I've searched for, which is too big for the onboard pcb holes.

Nothing that a file can't fix, just thought I'd mention.

Edited by johnwmclean
Posted (edited)

For the fuse, is 3.5A slow blow good for 240V, and for 100V/115V, is 5A slow blow OK? Or is the amperage too high?

 

I read there were people having their 2A fuses burnt out on 240V. What about 3.15A for 240V, and 4A for 115V?

 

If I am trying to push the current on the output stage to 8mA or 10mA, would that increase the power draw by a noticeable amount?

 

 

I will also be having a 2 pole circuit breaker that is also a switch at the live and neutral.
http://www.mouser.com/ProductDetail/TE-Connectivity-PB/W33-T2N1Q-5/?qs=sGAEpiMZZMvNllHT6Fj2fjyJLrUxEIJBwh69Ah0ZpOM%3d

Edited by kh90123
Posted

Oh you gotta be fucking kidding me, that listing just ended all sold out before I could buy some. Ffs

 

More listed now.

 

//UFN

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