Part Sourcing Assistance/Advice Thread

[JoaMat]

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.

[JoaMat]

This is how my first attempt to mill a pcb stencil turned out.

The aluminum sheet comes from a Burgenfels beer can.

[Kerry]

Looks great!

So if I’m reading this right, more projects means more beer.  That sounds right. 

[JoaMat]

yep 

[jose]

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

[UFN]

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

[jamesmking]

 

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

[jose]

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. 

[mwl168]

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

[jose]

 

 

 

 

 

[jose]

I tested it with my old DY294 and I have breakdown voltages from 1470 to 1485v.

 

 

 

[mwl168]

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

[JoaMat]

Breakdown voltages that high for 2SK216 seem extraordinary. If the DY294 readings are correct I would say that the devices probably not are 2SK216.

[jamesmking]

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

[jose]

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

[JoaMat]

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

[starcat]

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. 

[jamesmking]

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

[Pars]

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.

[starcat]

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

[JoaMat]

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. 

[starcat]

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

[JoaMat]

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

[starcat]

Anyone has some BC556CTA or know where to find the Fairchild C version? 

The BC546CTA is still available at Mouser though.

[JoaMat]

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