RobG 1,892 Posted October 27, 2012 Share Posted October 27, 2012 @LariSan, the bottom schematic does not show current sensing resistor, it appears there is one on the board, 22ohm, is that correct? BTW, 22ohm is pretty high for Rsc. Quote Link to post Share on other sites
cubeberg 540 Posted October 27, 2012 Author Share Posted October 27, 2012 No, the Rsc was omitted - it's not mandatory - it's there to prevent over-current. The 22ohm resistor is a current limiting resistor for the 5v filament on the tube. I'm thinking about ordering some of the inductors that oPossum suggested - they're definitely within the specs that we'd need - I need to look at the specs to see if the legs would be long enough to reach the holes since they're pretty far apart for the large axial inductor. Quote Link to post Share on other sites
oPossum 1,083 Posted October 27, 2012 Share Posted October 27, 2012 longer leads GeekDoc 1 Quote Link to post Share on other sites
oPossum 1,083 Posted October 27, 2012 Share Posted October 27, 2012 If anyone is desperate to get this running ASAP... Crack open a *cheap* car cell phone charger. You will probably find a usable inductor inside. They are usually 100 to 220 uH, so Ct may have to be increased to 1.0 to 1.8 nF. GeekDoc 1 Quote Link to post Share on other sites
oPossum 1,083 Posted October 30, 2012 Share Posted October 30, 2012 Got a few inductors from cubeberg and tested them: Small 67 uH 0.23 Q 1.94 DCR Large 1 64 uH 0.38 Q 1.34 DCR Large 2 63 uH 0.34 Q 1.30 DCR So they are all the value that is marked. The problem must be saturation due to the small core size. gordon 1 Quote Link to post Share on other sites
floridadrummer 1 Posted October 30, 2012 Share Posted October 30, 2012 Thanks for looking into this! So will the one you posted the other day work? Quote Link to post Share on other sites
oPossum 1,083 Posted October 30, 2012 Share Posted October 30, 2012 The two Mouser parts should work fine. They have a much larger core. GeekDoc 1 Quote Link to post Share on other sites
GeekDoc 226 Posted October 31, 2012 Share Posted October 31, 2012 I can do a group buy for these: http://www.mouser.co...2-RLB0914-680KL and some standard tactile switches if you guys like. I think it would end up at about $1.50 for an inductor and two switches shipped first class USPS (US only, sorry) in a regular envelope (with some kind of padding). I already have about 50 switches I can spare, so I could do about 25 sets. I can order more inductors than that, but leaving the switches out wouldn't really drop the cost (since I already have them). Any interest? Quote Link to post Share on other sites
bluehash 1,581 Posted October 31, 2012 Share Posted October 31, 2012 I can do a group buy for these: http://www.mouser.co...2-RLB0914-680KL and some standard tactile switches if you guys like. I think it would end up at about $1.50 for an inductor and two switches shipped first class USPS (US only, sorry) in a regular envelope (with some kind of padding). I already have about 50 switches I can spare, so I could do about 25 sets. I can order more inductors than that, but leaving the switches out wouldn't really drop the cost (since I already have them). Any interest? Good if you can do it. I suggested one here. One thing you need to think about is that you will have to write 20 to.from addresses. I'm in. Quote Link to post Share on other sites
GeekDoc 226 Posted October 31, 2012 Share Posted October 31, 2012 One thing you need to think about is that you will have to write 20 to.from addresses. Meh. I'm fine with that. I'm in. Let's do this right. I'm going to split up the parts, in case someone, like I do, has a bunch of tactile switches laying around and doesn't need them. $1.50 for an inductor shipped USPS in a regular envelope. You may have two switches free, if you need them. NAME INDUCTORS SWITCHES bluehash 1 2 EDIT: Inductors ordered from Mouser just now to speed turn-around (and because I want my clock working!). bluehash 1 Quote Link to post Share on other sites
bluehash 1,581 Posted October 31, 2012 Share Posted October 31, 2012 Awesome! Thanks. Did you make sure to add Mouser shipping to you? I just need the inductor. 2 of them Also.. it might be wise to break this out into its own gb thread. I can split it if you want and send an email to whoever bought it. Quote Link to post Share on other sites
GeekDoc 226 Posted October 31, 2012 Share Posted October 31, 2012 I'll start another thread in Buy/Sell. This will be GB #9, right? I did figure the shipping from Mouser + stamps, etc. Thanks. Quote Link to post Share on other sites
bluehash 1,581 Posted October 31, 2012 Share Posted October 31, 2012 . I'll start another thread in Buy/Sell. This will be GB #9, right? I did figure the shipping from Mouser + stamps, etc. Thanks. GB9.. I'll shift the nrlf radios to 10. Any idea where Cube is. Hope he's ok. Quote Link to post Share on other sites
cubeberg 540 Posted October 31, 2012 Author Share Posted October 31, 2012 Hey guys - sorry for the absence. I posted on the GB thread about switches. The new mouser parts should work - based on the formula oPossum provided, we need 800mA (based on 40mA needed by the tube) - and the inductor is rated for much more. I'll have to update the board to use the different inductor for future batches. Many thanks to GD for working on the group by! Quote Link to post Share on other sites
floridadrummer 1 Posted November 2, 2012 Share Posted November 2, 2012 I'm getting a ton of unresolved symbol errors when building in CCS. Any ideas on what would cause that? Follow Up: Turned out the paths in CCS are only working for me if they are absolute. Success! Ran for 30 minutes with no overheating! Quote Link to post Share on other sites
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