500pf variable cap, how can i get it?
500pf variable cap, how can i get it?
I am working with a circuit that calls for a 500pf variable cap and I cannot find one ANYWHERE.
Tried the usual suspects mouser, digikey, jameco, allied. Any ideas would be very appreciated.
thanks as always,
sayer
Tried the usual suspects mouser, digikey, jameco, allied. Any ideas would be very appreciated.
thanks as always,
sayer
two bpms & three dudes away from a hit.
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check surplus sales of nebraska, they usually have the arco variable caps.
otherwise, theres always the option of using a 12 pole rotary switch with several caps.
is this for an LA2A?
otherwise, theres always the option of using a 12 pole rotary switch with several caps.
is this for an LA2A?
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I wish, my dad wants me to show him how to build his own am radio for fun.is this for an LA2A?
I guess air america doesn't come in as well as he'd like in northern minnesota.
thanks man
sayer
ps. I don't think the rotary will work because it won't be sensitive enough???
two bpms & three dudes away from a hit.
variable cap
Leeds Radio definitely has them. it's the air gapped type used for tuning. Don't go by the website. it's only a fraction of what they have in there
www.leedselect.com
www.leedselect.com
365 pF was a very common unit "back in the day", and there are still some kicking around. Some were duals, so you could parallel two sections to get 730 pF.
I guess the crystal radio set builders would be an option, such as:
http://www.midnightscience.com/catalog5.html
I also found this:
http://www.oselectronics.com/ose_p96.htm
(hint...Google search for '365 pF variable capacitor')
What circuit are you looking at that requires a 500 pF variable cap?
Bri
I guess the crystal radio set builders would be an option, such as:
http://www.midnightscience.com/catalog5.html
I also found this:
http://www.oselectronics.com/ose_p96.htm
(hint...Google search for '365 pF variable capacitor')
What circuit are you looking at that requires a 500 pF variable cap?
Bri
thanks for the ideas people.
I guess part of the problem is that I don't know how precise the cap has to be to function correctly as a tuner. It is couple with a 200uh inductor. I also know that there are variable inductors but I am not sure what effect that would have propotionally.
heres a look at the circuit. this one seems to be floating around the web. There are a couple more that use ganged ICs but i thought i would rather keep the build more simple...
http://www.electronics-lab.com/projects ... index.html
I guess part of the problem is that I don't know how precise the cap has to be to function correctly as a tuner. It is couple with a 200uh inductor. I also know that there are variable inductors but I am not sure what effect that would have propotionally.
heres a look at the circuit. this one seems to be floating around the web. There are a couple more that use ganged ICs but i thought i would rather keep the build more simple...
http://www.electronics-lab.com/projects ... index.html
two bpms & three dudes away from a hit.
just since this IS the diy forum I thought I 'd post this page I saw about making your own variable capacitors.
http://www.eham.net/articles/5217
http://www.eham.net/articles/5217
two bpms & three dudes away from a hit.
Sayer wrote:just since this IS the diy forum I thought I 'd post this page I saw about making your own variable capacitors.
http://www.eham.net/articles/5217
That seems like a lot of trouble to go through for something you could easily order.
Check out this guy's radio sets...
http://www.schmarder.com/
wow, thats pretty over the top. i like how his coils are wound into spider web like structures.
Ok guys if I use a 365pf variable cap, how would that effect the value of the inductor which is 200uh for a 500 pf cap.
P.S. I can't believe you can't get the 500pf variable cap as a ceramic?!
sayer
Ok guys if I use a 365pf variable cap, how would that effect the value of the inductor which is 200uh for a 500 pf cap.
P.S. I can't believe you can't get the 500pf variable cap as a ceramic?!
sayer
two bpms & three dudes away from a hit.
Here is a 2 section 270pf variable cap from leeds radioSayer wrote:wow, thats pretty over the top. i like how his coils are wound into spider web like structures.
Ok guys if I use a 365pf variable cap, how would that effect the value of the inductor which is 200uh for a 500 pf cap.
P.S. I can't believe you can't get the 500pf variable cap as a ceramic?!
sayer
http://www.leedselect.com/images-caps/c ... x270pf.jpg
2x270 will give you 540pf
I'm telling you this guy has everything under the sun! I but most of my parts there.
A varactor is just a diode.
Here's a little light reading on it:
http://www.americanmicrosemi.com/tutorials/varactor.htm
http://en.wikipedia.org/wiki/Varicap
________
Vaporizer
Here's a little light reading on it:
http://www.americanmicrosemi.com/tutorials/varactor.htm
http://en.wikipedia.org/wiki/Varicap
________
Vaporizer
Last edited by philbo on Sun Mar 20, 2011 12:14 am, edited 1 time in total.
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