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How to Calculate Resistor Value for LED Lighting
No worries, kc0pet@... de KC0PET, Rick
No worries, kc0pet@... de KC0PET, Rick
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By
Rick Bennett
· #27940
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How to Calculate Resistor Value for LED Lighting
All, For a more detailed test device for testing and characterizing LEDs, I put this together last year. I can share gerber files if anyone wants to have a board made or could be persuaded to order mo
All, For a more detailed test device for testing and characterizing LEDs, I put this together last year. I can share gerber files if anyone wants to have a board made or could be persuaded to order mo
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By
Rick Bennett
· #27921
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SMT dummy load
I have been finding that the flat on the LEDs have been harder to see on many LEDs these days. I even had some that had the flat on the wrong side, ugh. I have started marking the -/cathode lead with
I have been finding that the flat on the LEDs have been harder to see on many LEDs these days. I even had some that had the flat on the wrong side, ugh. I have started marking the -/cathode lead with
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By
Rick Bennett
· #27584
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random/long wire
Doc, I have found that almost any wire works. I use a lot of #24 zip cord or speaker wire (stranded), I seem to always have a lot around and it is cheap. For more strength, I use #18, but others have
Doc, I have found that almost any wire works. I use a lot of #24 zip cord or speaker wire (stranded), I seem to always have a lot around and it is cheap. For more strength, I use #18, but others have
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By
Rick Bennett
· #27343
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Schematic Drawing
Jim, great pointers! I do like the "bridge" for no-connection. I have been using KiCad, not sure if it can do the bridge. Another thing is if possible to route the wires so they do not cross at all, I
Jim, great pointers! I do like the "bridge" for no-connection. I have been using KiCad, not sure if it can do the bridge. Another thing is if possible to route the wires so they do not cross at all, I
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By
Rick Bennett
· #27258
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ChipQuik
Dave et al, I am using the same ChipQuick as K8IQY. Thermally stable is good, also get a lot of paste for the money (https://www.tequipment.net/Chip-Quik/TS391AX50/Solder-Paste/?gclid=Cj0KCQjw852XBhC6
Dave et al, I am using the same ChipQuick as K8IQY. Thermally stable is good, also get a lot of paste for the money (https://www.tequipment.net/Chip-Quik/TS391AX50/Solder-Paste/?gclid=Cj0KCQjw852XBhC6
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By
Rick Bennett
· #27123
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OT - Is it a sign...
Is there a need for a support group for kilocycle users. Hi de Rick, KC0PET
Is there a need for a support group for kilocycle users. Hi de Rick, KC0PET
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By
Rick Bennett
· #26666
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SS-40 is Spoken For
The SS-40 I offered for sale earlier is spoken for. Rick
The SS-40 I offered for sale earlier is spoken for. Rick
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By
Rick Bennett
· #14847
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FS: 4SQRP SS-40 Receiver Kit
Doing some shack cleaning. I have an unbuilt SS-40 kit. Asking $25 shipped to the lower 48 (DX will be a little more). Please respond off-list if you are interested. Thanks for the bandwidth. Rick Ben
Doing some shack cleaning. I have an unbuilt SS-40 kit. Asking $25 shipped to the lower 48 (DX will be a little more). Please respond off-list if you are interested. Thanks for the bandwidth. Rick Ben
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By
Rick Bennett
· #14843
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Test
Seem to be having trouble. No need to respond.
Seem to be having trouble. No need to respond.
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By
Rick Bennett
· #13937
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Some advice please
I would use what you have on hand. Just about anything works for a small relay. As some have pointed out, for larger relays something with more current capacity would be better. I have used "mystery d
I would use what you have on hand. Just about anything works for a small relay. As some have pointed out, for larger relays something with more current capacity would be better. I have used "mystery d
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By
Rick Bennett
· #13941
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Home Brew Hand Key Finished
Nicely done, Jim de KC0PET, Rick
Nicely done, Jim de KC0PET, Rick
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By
Rick Bennett
· #13590
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Ferrite Suppliers
You might try ebay, it looks like you can get them quite a bit cheaper. Not sure how they compare to the $5 -7 ones but it might be worth a try for around $1 each. de KC0PET, Rick
You might try ebay, it looks like you can get them quite a bit cheaper. Not sure how they compare to the $5 -7 ones but it might be worth a try for around $1 each. de KC0PET, Rick
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By
Rick Bennett
· #13194
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12 Volt linear (not switching!) wall wart
Looks like these are not regulated, so the Jameco option is probably best. Rick
Looks like these are not regulated, so the Jameco option is probably best. Rick
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By
Rick Bennett
· #12125
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12 Volt linear (not switching!) wall wart
Mouser electronics still has some also but slim pickin's and somewhat hard to find in their search engine. Try this link. http://www.mouser.com/Triad-Magnetics/Power/Power-Supplies/Plug-In-AC-Adapters
Mouser electronics still has some also but slim pickin's and somewhat hard to find in their search engine. Try this link. http://www.mouser.com/Triad-Magnetics/Power/Power-Supplies/Plug-In-AC-Adapters
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By
Rick Bennett
· #12123
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EzKeyer III now in Morse Express' catalog
Sounds like a great partnership! de KC0PET, Rick
Sounds like a great partnership! de KC0PET, Rick
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By
Rick Bennett
· #11075
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OT - Ft Tuthill 80 Unbuilt Kit For Sale
The Tut 80 has been sold. 73s everyone. Rick
The Tut 80 has been sold. 73s everyone. Rick
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By
Rick Bennett
· #10915
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OT - Ft Tuthill 80 Unbuilt Kit For Sale
I am doing some shack cleaning. This one has been sitting around too long and I have too many other unfinished projects. Everything is still in the original unopened packaging. The manuals are availab
I am doing some shack cleaning. This one has been sitting around too long and I have too many other unfinished projects. Everything is still in the original unopened packaging. The manuals are availab
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By
Rick Bennett
· #10914
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Reminder
So in Chinese and some other related languages, the number 3 is "sa", "san", "sam", "sang", etc. Perhaps for this month it could be the "sam sunday sprint". Then we can return to English next month (h
So in Chinese and some other related languages, the number 3 is "sa", "san", "sam", "sang", etc. Perhaps for this month it could be the "sam sunday sprint". Then we can return to English next month (h
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By
Rick Bennett
· #9826
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4S QRP 40m Net
QSL
By
Rick Bennett
· #9498
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