| General > General Technical Chat |
| Why are good capacitors so expensive, and why don't they make these any more? |
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| mawyatt:
A good source for various capacitor types (surplus), they have Mica, Polystyrene, Polypropylene and NPO types, as well as many other components. https://www.surplussales.com https://www.surplussales.com/homenew.html#Capacitors Best, |
| CatalinaWOW:
Perhaps you can take a baby step into SMD by buying/designing a carrier that doesn't have a ton of capacitance or inductance. It is easy to imagine something that would end up resembling a disc capacitor. Not elegant, but lets you do SMD on a very small scale to start. |
| Zero999:
C0G capacitors are available in through hole. There's no reason not to use them. https://content.kemet.com/datasheets/KEM_C1045_AXIAL_MOLDED_C0G.pdf I would just use surface mount, even on a strip board. Part sizes from 603 to 1210 (805 is optimum) fit nicely between the tracks. There's no reason not to. |
| TimFox:
MLCC C0G ceramic capacitors are, indeed, available for TH mounting. Usually, they are a 0805 or similar size part with wire leads and coating. For vacuum tube designs or replacement, they may have too low a voltage rating: the discs used with tubes often were rated at 500 ot 1000 VDC. Ceramite (originally Sprague, now Vishay) still makes 1000 V NP0 discs, but only up to 270 pF (excellent parts). |
| MathWizard:
--- Quote from: CatalinaWOW on December 31, 2023, 07:12:40 pm ---Perhaps you can take a baby step into SMD by buying/designing a carrier that doesn't have a ton of capacitance or inductance. It is easy to imagine something that would end up resembling a disc capacitor. Not elegant, but lets you do SMD on a very small scale to start. --- End quote --- Of my SMD parts, 1206 size and sot-23 BJT's seem it fit ok between the pads on my perfboard. And all the parts I checked, matched very close to their rating. So now I'm going to make a common-base Clapp oscillator, and compare it to the through hole part version I made last week. |
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