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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Why so difficult; It's just a switch
Why so difficult; It's just a switch
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Old 27th January 2015, 09:23 PM   #1
Lamer is offline Lamer  United States
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Join Date: Jan 2015
Default Why so difficult; It's just a switch

I'm trying to build an attenuator but I'm new and having difficulty acquiring a simple mechanical switch

I'm trying to construct the following in a project box:

+4db balanced (XLR) -> [to] -> -10db balanced/unbalanced (1/4" phono)

(The [to] is a Jensen JT-6110K-B 4:1 stepdown transformer and associated passive circuitry on a breadboard at the moment)

I thought this bit of fun was about the transformer, I'd like to learn about them and this seemed the perfect excuse. Little did I know a couple of switches would provide all the "fun".

Basically, I want two switches, no? One for ground-lift on the +4b side and one to short ring to ground, or not, on the -10db side. I would like to use push-button switches. To make it simple I'd like to order two switches that work for either application. I've been looking for:

push-button, mini or micro, SPDT, >= 48V DC, >= 20mA

I think I want to stay away from the power in the circuit so no illumination.

I believe it would be terribly helpful to know the state of the switch, though, no? What I keep ordering, and receiving are switches that return to their original position. What I want is a switch that I press and *stays* depressed until I press again, then returns. What I keep receiving are switches that latch (aren't momentary) but always return to the same position; No external indication of their state.

Terribly frustrated at this point. What is the name of the thing I am looking for?

Thanks.
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Old 28th January 2015, 07:48 AM   #2
sgrossklass is offline sgrossklass  Germany
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Looks like you've gotten momentary action switches so far, while what you want is the latching variety.

BTW, toggle switches provide an even better visual indication.
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Old 28th January 2015, 10:40 AM   #3
DF96 is offline DF96  England
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Join Date: May 2007
No, I think he is saying that he has the correct switch electrical action but the button position looks exactly the same whichever electrical state the switch is in. The switch datasheet should make this clear; catalogue descriptions alone may be vague.
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Old 28th January 2015, 12:11 PM   #4
bentsnake is offline bentsnake
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<< What is the name of the thing I am looking for? >>

You want a pushbutton switch that stays down when you push it the first time (on), then stays up when you push it the second time (off). Thus a visual indication of on or off.

Sadly, as far as I know there's no such switch today (there used to be). I'm going to chime in with sgrossklass, if you don't want an indicator light, then you're pretty much stuck with toggle switches. But at least they do give a foolproof on-off indication.
.
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Old 28th January 2015, 10:19 PM   #5
davym is offline davym  Scotland
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I use minature toggle switches with silver plated contacts. I bought several from an ebay seller some years ago for a few pounds each.
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Old 29th January 2015, 03:04 AM   #6
DUG is offline DUG  Canada
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Join Date: Jan 2003
Location: mississauga ontario canada
Like this one?
Attached Images
File Type: jpg switch.JPG (5.6 KB, 103 views)
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