RalphTrimble
TVWBB Diamond Member
OK, got my HMv4.2.3 board nearly built up tonight but have a few questions.
On the image below, do I need to put jumpers where I drew the (8) red lines (2 per probe I assume)?
Next, it looks like there should be a capacitor below each pair of those jumpers? What value cap should go there? (where I traced out the red boxes)
Also, What does the "10K, 100K, 0.1u" mean where I have drawn the red box? (maybe I have answered my own questions below, please confirm if I am on the right track)
Looking at the schematic I see (4) 100K resistors in series with the probe leads, so I gather they are the R in the RC filters you added to the probes? Does that mean I should not be using the jumpers where I drew the red lines, and should put in a 10K, 100K, and .0.1u cap in those (4) spots instead of jumpers if I want to have the RC filters? Also assuming these resistors would need to be installed standing upright, and the (4) 10K resistors in that group are the pullup resistors for the probes (and are not optional)?
I don't have a 68K resistor here in my parts order, and don't see it on the HMv4.1 BOM either. It wasn't marked as a new part on your HMv4.2.3 BOM so I didn't order it....
The same goes for the 100K resistor (that you noted I should use in place of the 22K that I crossed out), I don't see it on the 4.1 BOM and it wasn't marked as a new part on the 4.2.3 BOM.
In addition to the above mentioned 100K resistor, I see the 4.2.3 BOM lists 4 more 100k resistors (R22, R23, R28, R29). They are not shown on the 4.1 BOM and weren't noted as a new component on the 4.2.3 BOM.
If you send anyone else a 4.2.3 board you should note the above mentioned resistors a new part that need to be added/ordered, and note that they should order extra 0.1u caps as well....
Finally, on mounting the LCD, when looking at the button side of the HM board, should the LCD board be under the HM board or on top?.... and the LCD and HM boards are supposed to sit right on top of each other (no space between them), correct?
I guess I wont be getting this board together until the end of the week at best, cause I ran short on 0.1u caps cause there are so many more used on this board, and I need to order those few resistors mentioned above as well. I don't have much faith in Radio Shack carrying these parts, they seem to carry very little electronics these days, they probably have more phones than resistors and caps... lol .... but I will stop in there tomorrow to see if I can find the caps at least, I've got a box of misc resistors and I bet I could find what I am missing in there if I dig, but wont have those caps....
On the image below, do I need to put jumpers where I drew the (8) red lines (2 per probe I assume)?
Next, it looks like there should be a capacitor below each pair of those jumpers? What value cap should go there? (where I traced out the red boxes)
Also, What does the "10K, 100K, 0.1u" mean where I have drawn the red box? (maybe I have answered my own questions below, please confirm if I am on the right track)
Looking at the schematic I see (4) 100K resistors in series with the probe leads, so I gather they are the R in the RC filters you added to the probes? Does that mean I should not be using the jumpers where I drew the red lines, and should put in a 10K, 100K, and .0.1u cap in those (4) spots instead of jumpers if I want to have the RC filters? Also assuming these resistors would need to be installed standing upright, and the (4) 10K resistors in that group are the pullup resistors for the probes (and are not optional)?
I don't have a 68K resistor here in my parts order, and don't see it on the HMv4.1 BOM either. It wasn't marked as a new part on your HMv4.2.3 BOM so I didn't order it....
The same goes for the 100K resistor (that you noted I should use in place of the 22K that I crossed out), I don't see it on the 4.1 BOM and it wasn't marked as a new part on the 4.2.3 BOM.
In addition to the above mentioned 100K resistor, I see the 4.2.3 BOM lists 4 more 100k resistors (R22, R23, R28, R29). They are not shown on the 4.1 BOM and weren't noted as a new component on the 4.2.3 BOM.
If you send anyone else a 4.2.3 board you should note the above mentioned resistors a new part that need to be added/ordered, and note that they should order extra 0.1u caps as well....
Finally, on mounting the LCD, when looking at the button side of the HM board, should the LCD board be under the HM board or on top?.... and the LCD and HM boards are supposed to sit right on top of each other (no space between them), correct?
I guess I wont be getting this board together until the end of the week at best, cause I ran short on 0.1u caps cause there are so many more used on this board, and I need to order those few resistors mentioned above as well. I don't have much faith in Radio Shack carrying these parts, they seem to carry very little electronics these days, they probably have more phones than resistors and caps... lol .... but I will stop in there tomorrow to see if I can find the caps at least, I've got a box of misc resistors and I bet I could find what I am missing in there if I dig, but wont have those caps....
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