I got these assisting clearing out a storage. There was lots of military parts as well as all kinds of electronics. Anyways these caps are a bit mysterious. They measure dead flat up to tens of MHz.
I took one pack apart and there are two caps a little fatter than the last one. The bigger ones measure a tad over 400nF.
Are they mica?
Guess I will need to build a new phono pre or something to try these out.
Thanks for help. I have tried googling and no luck.
I took one pack apart and there are two caps a little fatter than the last one. The bigger ones measure a tad over 400nF.
Are they mica?
Guess I will need to build a new phono pre or something to try these out.
Thanks for help. I have tried googling and no luck.
Attachments
Gently warm / cool them and see how much the capacitance changes vs temperature. That will give you more clues.
a measuring instrument's oscillator or time base would be a more appropriate use than a phono preamp .There's no vinyl to play 10 mhz ...
I doubt they can be mica. Mica is a crystaline material, not noted for being able to bend, nor for being available in long rolls given its mined, not manufactured.
The construction looks like flat-rolled film construction, like LiPo batteries, used for its spatial efficiency compared to cylindrical roll.
The construction looks like flat-rolled film construction, like LiPo batteries, used for its spatial efficiency compared to cylindrical roll.
Designing a circuit to make use of one off parts is generally a bad idea imo. They have curiosity value but that's about all.
I used an HP analyzer, the phono pre is just an idea to use 400nF-ish capacitors.
The ability for a cap to be flat up into MHz is just a sign it is non inductive probably mute for audio but in a way a quality figure.
Totally agree. But most of what I make is motivated by something I have at hand. I hate having stuff laying around... ooops I have so much stuff laying around I go crazy never deciding what to make...
use the cheapest capacitors first then try the next quality and so on until you find the lowest quality capacitors that does the job.
Thanks for replies, I did some more searching...
I guess they are mica paper caps.
Kinda like these: 高温高压云母介质电容器-Aluminum Electrolytic,Disc Ceramic, Film, Solid Tantalum, Super Capacitors.
I guess they are mica paper caps.
Kinda like these: 高温高压云母介质电容器-Aluminum Electrolytic,Disc Ceramic, Film, Solid Tantalum, Super Capacitors.
