| Electronics > Beginners |
| Has anyone seen these two types of capacitors? |
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| RonFred2:
While sorting a box full of parts from the 1980's I found two capacitor types I have never seen before: * Glass bead looking thing measuring 1.5 nF (see photo) Tubular looking thing with outer coating like ceramic measuring 150 pF (see photo) * Can someone tell me what type of capacitor they are and best usage in design/circuit? Also do you think these caps are still good after 35+ years? |
| ArthurDent:
Here you go. |
| ataradov:
The transparent one is a polystyrene film capacitor. They do age due to plastic shrinking, but it is still probably fine. Tubular one is old-timey ceramic capacitor. Probably also works. But there is no real point in using either of them nowadays. |
| floobydust:
The 152J is a polystyrene film capacitor 1,500pF 5%. Xicon manufactures them, available at Mouser. They are for applications needing low dielectric absorption, and audio filters, timing use. Not so popular today because they are large size. The tubular or "dog bone capacitor", usually have a large temperature coefficient to correct RF circuits over temperature. They were popular in Tektronix scopes through the 1980's. |
| Benta:
From what I've heard, polystyrene caps are no longer produced, as polystyrene film has been phased out. Replacement is polypropylene. |
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