And even good old 7805s don't take kindly to reverse polarity.

#building

And standardized the connectors to all 5.5/2.1

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I've converted all my 5 volt kits to 12 v with boost/buck power supplies.

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Briefly applying 12 V to a 5 V circuit never ends well. I would suggest using a 7805 device to step the 12 V down to 5 V.

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As to the voltage input, the connector is a different size. The 12 v kit connector will not plug into the 5 v kits. I suppose you could fuss around and briefly apply 12v.

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The VFO signal generator kit comes with a switching LPF kit and the assembly instructions with it set up a default set of 6 jumpers that need to be installed. I assume that this is the setup one wants

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I noticed that this kit also contained a couple of extra toroids: 2 of 0.5"D black toroids as well as the 2 yellow 0.37" ones. So I guess I have 2 more items for my junk box. 73 wt1v

#problem #30m #building

It’s just an extra. Toss it in your junk box. I suppose you could parallel it with C2 or C5 if one of the trimmers didn’t peak correctly. But you normally just add or remove turns or squeeze or spread

#problem #30m #building

In this kit I have 2 trimmers and 4 caps. C2, C3 & C5 are installed, but the table mentions an "extra" 10 pf and no C4 listed. I can find nothing about this extra cap and what to do with it. I certain

#problem #30m #building

I’ve been using Autodesk’s Eagle software for circuit design and PCB layout. It is free as long as you don’t make money off of your design. Oshpark accepts the single Eagle .brd file, so you don’t hav

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One of the handy tools available for DipTrace (and others) is the availability of the "Library Loader" tool supported by most of the component sellers. You decide to use a part, access Library Loader,

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Fortunately, there are services like: https://www.snapeda.com https://componentsearchengine.com https://www.digikey.com/en/news/press-releases/2018/feb/common-parts-library-update-for-kicad-eda-tool S

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I began using DipTrace after trying several other PCB packages. One significant disadvantage with ANY package is that they don’t keep up in real time with new component releases, and even many legacy

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I definitely agree. 73 wt1v

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Oh yeah, I've been using https://www.kicad.org schematic capture, footprint editor, and board layout software, which uploads directly into https://oshpark.com and you get your boards in a week or two.

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If there is anyone like me who likes to get into new areas of building, besides just kits, then you may have fooled around with building something out of QST or elsewhere from scratch. I decided on a

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On March 1, 2018 I ordered some QRP kits that I was advised to get, but due to medical problems until now I did nothing. I had viewed Ham Nations on my TV and they talked about an all mode QRP transce

#help #building

Hello Hans, "The 4 holes in the corners of the enclosure are not used. There are not supposed to be any holes for them in the top half of the enclosure. None at all. Those four corner holes are merely

#50w #case #building #pa

Hi Kevin With all due immense respect, and apologies in advance, I still respectfully suspect that you might have misunderstood the assembly sequence, sorry ;-) The 4 holes in the corners of the enclo

#50w #case #building #pa

Hi Hans, I was wondering if there may possibly have been a manufacturing defect in the top case. Such as the four PCB holes for the fixing screws inadvertently not drilled and tapped. You perhaps will

#50w #case #building #pa