The circuit board does not have the markings to show positive and negative. Thanks in advance. Aug 15, 2. Aug 15, 3. I meant. The original part is ceramic non-polarized. I went ahead and ordered the. This is the last step of the mod and I wanted to finish it so I was wondering if I could use an electrolytic.
I suspect you can't. I'll just have to wait until the. This change to a. Aug 18, 4. Easier to just go with plastic film caps.
You don't need to be exact on the paper and electrolytic caps. Yes, volts or more is fine. Not for actual use. For sure not if they cost any money.
Would be like buying any other 40 year old canned goods. Even Campbell's. The exception would be if you want the shell to use for restuffing. Electrolytics are perishable. Time takes its toll, even when they are brand new, in the box. Brand new 3. These do cost much more, perhaps one dollar each. To answer your original question, yes you might use a ceramic replacement for the 3uF electrolytic.
This is no TV set sweep section. Linearity is not a concern. More important, they will be packaged for surface mount use on a PCB. This value will be plenty large enough to see, however, and could be adapted for use in a radio chassis. Someone will be happy to make suggestions. Electrolytic caps exist because they were designed to be a low-cost, large cap value in a small package. And can you measure this while in use?
Ebay dont has any datasheets, they are rated for 50 volt. If you want specs you can rely on, don't buy on ebay. Quote from: suicidaleggroll on November 08, , pm. Normally with normal elkos, you need the nF, its about in every schematic. I mean : what could go wrong with making such a simple part? I also going to try ebay for film capacitors, since they are better for audio, or dont you buy these also?
If you buy via eBay you'll get whatever is most cheap and available in Shenzhen. Tomorrow's caps could be different from yesterday's. You can't even expect that they are 50V types. What do you think why they are so cheap?
Quote from: JanJansen on November 09, , pm. Siwastaja Super Contributor Posts: Country:. I'm surprised of the always touted notion of Ebay parts being "cheap". Usually, in my experience, they are horribly expensive, usually much more than the proper parts at the proper distributor. For example, proper capacitors typically cost something like a few cents each. You are not saving anything on the components.
Of course, the real distributors often ask for postage fees exceeding those of Ebay sellers, or have minimum order limits for free shipping. Also, it's much worse than not having proper or unknown specifications. Usually, they are outright inoperable scams. Capacitors may not be capacitors at all. Just don't buy them. So, any price comparison is totally meaningless when you are not getting the product you are buying! I can sell you anything you want even cheaper, just send me your money!
I won't send you anything, but come on, it's cheaper! Quote from: suicidaleggroll on November 09, , pm. Quote from: Siwastaja on November 09, , pm. Rotary encoder is maybe a prime example of a part where quality matters. Shitty rotary encoders are a real plague, and that does include some higher cost, "quality" parts.
For example, we have a totally unusable Agilent oscilloscope because of bad rotary encoders. Thank you. One point of disagreement. Disc ceramic capacitors are generally avoided in audio circuits due to piezoelectric effect. Under some circumstances they can generate voltage if subjected to physical force, like sound waves. This phenomenon is totally irrelevant when they're used at RF frequencies. By the time you have gathered enough ceramic capacitors to match the capacitance of the electrolytic cap you are replacing, you will have a box of ceramic caps that won't fit inside your radio cabinet.
Electrolytics, with all their associated problems, are used to obtain a large capacitance in a small package. With recent developments, it is sometimes possible to use film capacitors to replace smaller electrolytics, say 4 or 8 microfarads, but very expensive.
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