Need a switchable Input Cap Diagram

Started by Wagster, May 26, 2008, 06:12:29 PM

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Wagster

I'm building a Range Master and need a switchable input cap diagram.I've tried the search q/o any luck.


Dragonfly

Quote from: Wagster on May 26, 2008, 06:12:29 PM
I'm building a Range Master and need a switchable input cap diagram.I've tried the search q/o any luck.




The FIRST result using the phrase ""switchable input cap" contains links to TWO diagrams. There are only two posts in the thread, so they're easy to find.



Wagster

Hmm I still don't see it.I'll keep searching  ;D

Check your PM btw

GREEN FUZ

#3
 :icon_lol:  :icon_lol: I just tried it. The first thread that comes up is this one. :icon_lol: :icon_lol:

The irony is; the more people post, without doing a proper search, the more threads on a particular topic come up when someone else does, many of them being variations of the same question, making it even harder to find the salient information.

I`m not pointing any fingers by the way just passing a general comment. :)

Dragonfly

Quote from: GREEN FUZ on May 26, 2008, 06:44:10 PM
:icon_lol:  :icon_lol: I just tried it. The first thread that comes up is this one. :icon_lol: :icon_lol:

OK...first thread OTHER than this one....  ::)



;D

Dragonfly

Here...I'll make it easy :)

http://www.diystompboxes.com/smfforum/index.php?topic=54947.0

Quote from: Threefish on March 03, 2007, 01:41:37 AM
I've done switchable caps using DPDT switches, like this:
http://www.putfile.com/pic.php?img=4895931
(it's the underside of the switch and it's six lugs - the oval things are the caps and their leads)
It's a bit rough, but I'm sure you get the idea. Where the single cap would be, solder in the middle lugs of a DPDT switch. On the pairs of outer lugs, solder in the two caps. Throwing the switch sends the signal through one of the caps. You could use a single pole switch, and where the second lot of lugs would be, solder one end of each cap to the wire that would go to the second middle lug. I use DPDT's so that you can easily change caps, instead of having to resolder the two-caps-plus-a-wire at one end if you want to change one or both. It's neater too.
I've also made a three way switch out of a centre-off DPDT by adding another cap to the middle lugs (not claiming this idea as my own, got it off someone here I think) :
http://www.putfile.com/pic.php?img=4896002
If A is a .05uF, B a .05uF and C a .082uF, you'll get .05uF in the middle position, .1uF in upper position (.05 + .05uF), and .132uF in the lower position (.05 + .082).
You can do all sorts of clever things like that with switches. You just have to be careful about lead length (to and from the switch) and noise if the leads are too long.
Most of my builds could feature 5 or 6 switches, but the number of variations can get very silly very quickly....

Click the links

:)

Wagster

Well dang there it is.Okay I feel like a dumbass  ;D

Thanks,
Tard

Dragonfly

Quote from: Wagster on May 26, 2008, 07:26:08 PM
Well dang there it is.Okay I feel like a dumbass  ;D

Thanks,
Tard


:D

I've done it a hundred times !