JoaMat Posted April 3, 2021 Report Share Posted April 3, 2021 Thanks for the input. I use the software FlatCAM to convert CNC files from gerbers. Eventually I found the way to invert a gerber with just one push at one button. I’m very embarrassed I didn’t noticed the button, it has been in front of my nose all the time. Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 4, 2021 Report Share Posted April 4, 2021 This is how my first attempt to mill a pcb stencil turned out. The aluminum sheet comes from a Burgenfels beer can. 5 Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 4, 2021 Report Share Posted April 4, 2021 Looks great! So if I’m reading this right, more projects means more beer. That sounds right. 2 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 4, 2021 Report Share Posted April 4, 2021 yep Quote Link to comment Share on other sites More sharing options...
jose Posted April 29, 2021 Report Share Posted April 29, 2021 (edited) I have arrived from northern Europe some 2SK216 (thanks Joamat 😉 ) but I have doubts as to whether they are original What do you think? I have tested them and they all give more or less the same values although looking at the data. Edited April 29, 2021 by jose Quote Link to comment Share on other sites More sharing options...
UFN Posted April 29, 2021 Report Share Posted April 29, 2021 (edited) 46 minutes ago, jose said: I have arrived from northern Europe some 2SK216 (thanks Joamat 😉 ) but I have doubts as to whether they are original What do you think? I have tested them and they all give more or less the same values although looking at the data. Are the pin connections correct?. Most of the fake 2SK216s are remarked devices and they don't have the same pinout. Not a guarantee, but a strong indication. Edited April 29, 2021 by UFN Quote Link to comment Share on other sites More sharing options...
jamesmking Posted April 29, 2021 Report Share Posted April 29, 2021 (edited) 2 hours ago, jose said: I have arrived from northern Europe some 2SK216 (thanks Joamat 😉 ) but I have doubts as to whether they are original What do you think? testing breakdown voltages would be a good idea. Fingers crossed you have a real ones. Here is some high resolution photos of a known good one from a reliable source- and its brothers are working my T2... Markings are printed not etched and are a greyish cream colour not white. (photo has been colour balanced). Ends of legs are fairly sharp. close up of the circular area in the middle. Lighting adjusted to make the text in the dimple more readable at the expense of the printed markings. Text in the dimple is raised. The starting angle relative to the top of the transistor for the word MALAYISA and the associated number and letters in the dimple varies between the 216s I have. Edited April 29, 2021 by jamesmking 1 Quote Link to comment Share on other sites More sharing options...
jose Posted April 29, 2021 Report Share Posted April 29, 2021 Thanks you guys Pin connection is OK. I'm going to take some photos with the microscope. I'm going to take out my old sand tester to do a breakdown voltages test. Quote Link to comment Share on other sites More sharing options...
mwl168 Posted April 29, 2021 Report Share Posted April 29, 2021 (edited) From an appearance stand point, the genuine 2SK216 I have all have the wider part of the pins being much longer than typical TO-220 parts. The one Jose shows does look the part (and consistent with the one James shows). Edited April 29, 2021 by mwl168 Quote Link to comment Share on other sites More sharing options...
jose Posted April 30, 2021 Report Share Posted April 30, 2021 1 1 Quote Link to comment Share on other sites More sharing options...
jose Posted April 30, 2021 Report Share Posted April 30, 2021 I tested it with my old DY294 and I have breakdown voltages from 1470 to 1485v. 1 Quote Link to comment Share on other sites More sharing options...
mwl168 Posted April 30, 2021 Report Share Posted April 30, 2021 (edited) 35 minutes ago, jose said: I tested it with my old DY294 and I have breakdown voltages from 1470 to 1485v. Hmm, that seems awfully high for the 2SK216. I was expecting 200V or slightly higher. Nice microscopic photos. Edited April 30, 2021 by mwl168 1 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 30, 2021 Report Share Posted April 30, 2021 Breakdown voltages that high for 2SK216 seem extraordinary. If the DY294 readings are correct I would say that the devices probably not are 2SK216. 1 Quote Link to comment Share on other sites More sharing options...
jamesmking Posted April 30, 2021 Report Share Posted April 30, 2021 (edited) the style of that 6 in the 2sk216 seems a lot different from mine. But maybe they changed font... perhaps its a 7s2sk216 (7 2sk216 is series. in a single package)... 🤪 I just tested a few of mine. Setup on the DY294 : selected NPN gate and source connected to the emitter on the dy294 drain connected to collector on the dy294 and I get around 230V breakdown. spec sheet says 200V.... ----------------------------------------------------------------------- My peak dca75 in identify mode says the following: N-Ch Enhancement mode MOSFET Vgs(on)=0.557V at Id=5.01mA and Ig=0µA Vgs(off)=0.080V at Id=5.3µA gm=25.6mA/V at Id=3.0mA to 5.0mA Rds(on)=6.1Ω at Id=5.0mA and Vgs=8.0V with body diode Edited May 2, 2021 by jamesmking 2 Quote Link to comment Share on other sites More sharing options...
jose Posted April 30, 2021 Report Share Posted April 30, 2021 (edited) 1 hour ago, jamesmking said: I just tested a few of mine. Setup on the dy295: selected NPN gate and source connected to the emitter on the dy294 drain connected to collector on the dy294 and I get around 230V breakdown. spec sheet says 200V.... --------------------------------------------------------------------- source left disconnected otherwise same setup gate connected to the emitter on the dy294 drain connected to collector and I get around 255V breakdown. ----------------------------------------- Thanks James I was checking them with a wrong connection. Now I can read from 230 to 235v PD. I'm sorry it's hard to hold all of this with one hand Edited April 30, 2021 by jose 2 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 30, 2021 Report Share Posted April 30, 2021 (edited) Great to hear about the new measurements which are in line with genuine 2SK216. When testing field effect transistors DY294 manual says “A short circuit should be formed between G and S pin. Otherwise the transistor can easily be damaged.” To make testing of k216/j79 a bit easier I’ve made a simple adapter for the DY294 tester. Edited April 30, 2021 by JoaMat 2 Quote Link to comment Share on other sites More sharing options...
starcat Posted May 7, 2021 Report Share Posted May 7, 2021 On 5/1/2021 at 1:13 AM, JoaMat said: To make testing of k216/j79 a bit easier I’ve made a simple adapter for the DY294 tester. Hey JoaMat, what adapter is this, can you please share? Need to test all mine for the DIY T2. Quote Link to comment Share on other sites More sharing options...
jamesmking Posted May 7, 2021 Report Share Posted May 7, 2021 (edited) rather than create an adapter I soldered clip leads onto the pcb and ran the leads through the existing holes in the plastic case: The clips also allow me to use adapters for sot23 etc etc. (the same adapters I also use with my peak dca75 transistor tester and identifier) Edited June 13, 2021 by jamesmking 1 Quote Link to comment Share on other sites More sharing options...
Pars Posted May 7, 2021 Report Share Posted May 7, 2021 I don't have either of the devices that James has (dy294 or the peak atlas dca75... wish I did), but I built an adapter for the Toshiba dual JFETs using a zig-zag socket, a piece of PCB board, and some thick diode leads. I'll try to post a pic later. This, in conjunction with James' mod with the clip leads, would make this easy. 2 Quote Link to comment Share on other sites More sharing options...
starcat Posted May 7, 2021 Report Share Posted May 7, 2021 3 hours ago, jamesmking said: rather than create an adapter I soldered clip leads onto the pcb Thanks, James. Always impressive to see shipping cost more than the actual item: https://www.ebay.de/itm/283700277843 1 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 7, 2021 Report Share Posted May 7, 2021 4 hours ago, starcat said: Hey JoaMat, what adapter is this, can you please share? Need to test all mine for the DIY T2. I’m out of town for a couple of days, but I see if I can post a picture of it when back home. Basically it just a piece of pcb, some three pin socket (green I think) and two wires. 1 Quote Link to comment Share on other sites More sharing options...
starcat Posted May 7, 2021 Report Share Posted May 7, 2021 (edited) Adapter was the magic word. Made one with a 3-pin Dupont connector... very easy to swap the transistors. Thank you very much, champs! The 2cs3675 test somewhere between 1030-1120V on the DY294. Any special test procedures I should follow? Testing first with the Peak DCA75 checking pin's and type then the breakdown voltage with the DY294. Edited May 8, 2021 by starcat 4 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 8, 2021 Report Share Posted May 8, 2021 That’s similar to what I do. But I have left and middle pins connected to one wire going to E on the meter while the third pin goes to C. When I measure j79/k216 I just put the transistor into the socket (be aware of orientation). For c3675 and a1486 I put their C and E pins into socket accordingly. When measuring breakdown voltages C and E are involved. If you want to measure Collector Emitter breakdown voltage than Collector to C and Emitter to E while Base is floating. In case you are measuring a Mosfet you should connect Drain to C and Source and Gate to E. Duoyi DY294 Operating Instructions.pdf 1 Quote Link to comment Share on other sites More sharing options...
starcat Posted May 10, 2021 Report Share Posted May 10, 2021 Anyone has some BC556CTA or know where to find the Fairchild C version? The BC546CTA is still available at Mouser though. Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 10, 2021 Report Share Posted May 10, 2021 On 5/7/2021 at 1:31 PM, starcat said: Hey JoaMat, what adapter is this, can you please share? Need to test all mine for the DIY T2. Here is the simple adapter I made. Black wire connected to left and middle pins of the green holder and red wire to right pin. Black banana to E on the meter and red to C. At some point I must have changed C and E connectors on the meter to bananas but I can’t remember having done that… P.S. Found this in cyber space: https://jestineyong.com/duoyi-dy294-meter-repair/ https://www.pa4tim.nl/?p=6022 2 Quote Link to comment Share on other sites More sharing options...
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