I've used the 75, 1/2 watt with success.
What gauge wire are you using to mate the module with the board? I'm having issues.
I've used the 75, 1/2 watt with success.
See post #8rcs, I have a question, on your Mouser BOM you have R2 listed as a 75ohm 1/2 watt resistor, but in your PDF from page 1 you have R2 listed as a 1K ohm 1/2 watt resistor. which is the correct resistor?
Of course!Can you post an image of the install?
Is Q5 installed correctly?
Double check the TO-220 placements. Q3 should be a NPN, an MJE15032 or equivalent. Q2 a PNP.
Other than that It looks good.
The smaller wires should work, certainly on the DBT. But might be an issue at full power with volume?
Noted.At some point in time I think that we should work on a proper set of documentation, to hopefully avoid obvious mistakes and bundle up all the pieces of important info scattered about.
I looked over the ebay info and it looks good, I did see that it specs M3 screws and the Mouser BOM calls out 4-40. Why M3? when the BOM calls out screws of correct length. The idea is to make things easier not have to chop down screws to length? 22AWG is fine imo. Could even use a smaller gauge and it can act as a fuse
At some point in time I think that we should work on a proper set of documentation, to hopefully avoid obvious mistakes and bundle up all the pieces of important info scattered about.
I looked over the ebay info and it looks good, I did see that it specs M3 screws and the Mouser BOM calls out 4-40. Why M3? when the BOM calls out screws of correct length (Know one has told me that they are wrong so far). The idea is to make things easier not have to chop down screws to length? 22AWG is fine imo. Could even use a smaller gauge and it can act as a fuse
Always check that the live TO-220 bjt mounting tab (collector) is isolated from the Al plate! Did you use the shoulder washer?
Fuses, p23 in the SM
Thanks for those images and that resource! That was how I originally screwed it in.The nylon shoulder washers are used first,only needed on the TO-220 devices, required to isolate the mounting screw threads from the live voltage on the device metal package, so it is, nylon washer, flat washer, screw in this order.
Make sure that the shoulder washer seats correctly in the TO-220 mounting flange(tab) hole and the shoulder is not damaged which could make it off centre.
Look at figure 5 in attached pdf. No nut required as the al plate is tapped thus acts as the nut.
In this thread, there are a few images of an assembled module and
http://www.ebay.ca/itm/STK-0050-Module-W-Power-to-operate-sets-up-to-100-Watts-Open-Source/122649581190?ssPageName=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649
good luck
Rick
Yes of course, the idea is to get all the parts from one supplier, if possible, to minimize costsMcMaster-Carr carries both SAE and Metric in every style you can think of.
Yes of course, the idea is to get all the parts from one supplier, if possible, to minimize costs
As far as initial check out, it is a another idea to measure with an ohmmeter in diode test mode the module b4 it is installed
1) path from pin 10 to 8, red (+) lead on pin 10
2) path from pin 1 to 3, red (+) lead on pin 3
This checks that the bjts are installed correctly. Both paths should read close to the same, basically 2 diode drops plus the small value resistors