Lets build a capacitor

We build a simple capacitor out of 2 plates of aluminum, measure the capacitance, and insert different dielectrics between the plates to access the affects
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[@WECB640]

EXCELLENT lesson/review Paul. 73

[@W1VLF]

Thank you Sir!!

[@karlschulte9231]

Excellent! I used to do that for my work in a precision R & L lab. Used for analog computers and research. Polystyrene, polycarbonate and teflon were used for various effects. I still have a few resistors ranging from "crude" 1% through .001%. Capacitors, sealed & filled with dry nitrogen,and temperature cycled were 0.1 to 0.01, with a few 0.001% . Think $$. As they change after heat/ cold cycling to improve stability, they are wound with that in mind. So we got a gausian curve result, sorted by selection into accuracy ratings. One set was built in nice cases for Stanford, .001 uuF through 1farad ( refridgerator size). But you can easily make decent audio and rf filter/ bypass and blocking ones in the home. Use saran wrap and aluminum foil . Calculate what value needed and size of " plates" and cut 2 strips accordingly. Lay strip of saran down first, next foil, offset a bit to one side about 1/4", then center another plastic strip. Last comes the final metal one, offset to the opposite side. The metal foil should be an inch or so shorter than the plastic strips and centered lengthwise. Now carefully roll up the layers all together, like a rolled up newspaper. A little scotch tape on side and ends hold things in place. Roll as tightly as can. At finish, more scotch tape goes around like belt. You see two brush like fans of metal on each end, after all is secured by tape. But do not the metal ends, which should be sticking out 1/4 inch at each end. Squish them down on table using book or dish to squeeze and tap them flat. We then used a big iron and aluminum solder to attach leads. If that is not an option, use 2 leads with a ring of several turns in spiral shape and, with someone to hold them in place, wrap lengthwise with electrical tape end to end, with a little tension. Use about 5 turns. You can now dip it in epoxy or the black vinyl stuff used to cover tool handles. Let dry by hanging, but be sure newspaper is underneath if this is in kitchen or mom/sweet wife will get a little distraught with tar like goo on her table. A 3 ft by 1 inch makes very useable bypass cap for rf and 3 inch width works for audio. Quite useable for RF bypass around headset on a crystal radio. Note: not for tune circuits. Not exactly silver mica. 73 Karl WA2KBZ.😢

[@patuxenthistory6410]

During the early days of radio everything was hand made. The transmitters were much like a generator . I'd love to see anyone build an old style transmitter.

[@gonebamboo4116]

Nice. Need the high voltage variable for transmitting loops.

[@migalito1955]

Nice demonstration. What is the loss factor indicating the loss of ??

[@migsvensurfing6310]

Happy new radio year

[@patrickdemeyer2210]

Hi , waiting for the next super video , or did you stopped the video's. Kind Regards. A SWL.

[@1rfsam]

Great demonstration, thank you! Do you by any chance know the frequency or frequency range of this LCR meter? Might be changing with outranging. Just curious. I checked it's manual and found no info.

[@W1VLF]

Hi Sam... many LCR change frequency as you say. Example low freq. 100 HZ for large UF values to 100 KHZ for low PF values. I was curious as you were, so I put a oscilloscope across the LCR leads and measured 3 values 250 UF , .01 UF and 30 PF this LCR meter uses 1 KHZ and does not change freq during the measurement of all those values... W1VLF

[@DanielBerzinskas]

I was first to see this I think

[@DanielBerzinskas]

and to comment

[@gonebamboo4116]

Wow! Congratulations on both of these accomplishments

[@ianbutler1983]

@@gonebamboo4116 Yes, we are all envious.