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Forgot to mention - one thing I've noticed is that much more modern non-hermetic Ta caps like encountered in surface-mount on things like PCs and laptops, don't seem to be much trouble. I'd expect

So, on the subject of those dipped "orange drop" tants: they suck.? They go bad with age seemingly, because I am told, the seal is not made to last and they dry out and short. I have seen literally

I think you'll find that your stock of non-hermetic (like dipped) Ta caps are less reliable than expected, due to environmental issues like humidity after many years, even if never used before. The

Some tantalum capacitors needed a small resistor of a few ohms in series with the supply voltage to limit the dV/dt and inrush current as well. Hugh Gilbert [email protected]> wrote:

Hello Gary, Tantalum capacitors’ working Voltage rating is for marketing purposes only. The Arrhenius equation regarding time to failure applies. As you approach the rated Voltage, the time to

I'm sure we've all repaired some equipment where a tantalum capacitor has shorted. I lived for 30 years in San Jose, and collected lots of parts, including a lifelong supply of teardrop tantalum

Thanks. It's a long time since I wrote that software program but (to compute Q) I think the program uses a map based on empirical measurements made decades ago by Butterworth and Medhurst some time

Thanks. It is a bit hard to see the blue arc in the image so I've thickened up the blue trace width and plotted it again without the markers. The top of the blue arc corresponds with the start

Maybe because I also wrote them?... The ones I ordered before - bulk foil Z201 - are not smd, though, and I wonder if that has to do with them coming up with an MOQ (the VSMP1206, which is what I

Thanks very much, jmr, for going to the trouble of running the numbers through Genesys. You've provided a valuable cross-check of my cheese formulas, which give L = 64uH, Q = 190, and srf = 16MHz. The

Richard, It is a short blue arc at the right edge of the chart.? Pretty hard to see unless you save the image and enlarge it. --John Gord

I see zilch on the chart. Did something get left out? -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

Here's what you should see on a smith chart with a start frequency of 1 MHz and a stop frequency of 2 MHz when resonated at 1.45 MHz with a 187pF cap and with a series 50R resistor inline.

If it helps add some confidence to this stuff, I used the air cored solenoid model in Genesys to predict the inductance and Q vs frequency for your coil. 49 turns 31mm diameter length 22mm wire

I asked for the 1206 size as I only needed 1/8W and the price was less. Here's the part https://webdirect.texascomponents.com/ProductDetails.asp?ProductCode=VSMP%5F1206%5FCUSTOM%5F0%2E01 Looks like I

If I go with what you posted earlier I can assume that your current tank coil has 49 turns on a 31mm OD former using 0.4mm diameter wire (close wound) I can punch these numbers into the software

That's surprising to me - I hope they're not changing their business model. I've been able to order single parts at my exactly specified value to two decimals before, on the Z201 variety. Is this what

I contacted TTC and the reality is less exciting than what their website suggests.? T heir reply was "The MOQ for the series is 5 pc. since is a very peculiar R value." Not sure why my 'any custom

Hi jmr, Well, it's an interesting methodology for sure. I do have a Nanovna which I bought purely for evaluation purposes, but I have two proper lab-grade HP VNAs as well. Can't recall the model

Thanks, Froggie. By all means PM me when you have access to all your test equipment again.