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 Post subject: Toggle switch rating Q ...
PostPosted: Sep Sat 08, 2018 9:04 pm 
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Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
hi friends,

toggle switch on my old Fairchild 412 is bad ... it's a Und Lab 3A 250v / 6A 125V w/ an extended 1" neck (turntable's base is very thick) i found another switch w/ ball tip, 1" neck but it's rated 3A 125v /1A 250v

is this an adequate substitution?

thanks in advance,
mike


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sat 08, 2018 10:37 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17700
Location: Albuquerque, NM 87123
Is the toggle switch really bad? I have cleaned thousands of them and brought 95% back to life. Just dribble several drops of Deoxit down past the toggle (with the switch upright) and actuate the switch about a hundred times.


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sat 08, 2018 11:08 pm 
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Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
ha ok ..

maybe not but terminal broke, leaving nothing to solder to ... case of switch is riveted together w <tiny> rivets.
easier for me to get another.

will the new value mentioned initially, work?

thanks, johnny,
mike


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sun 09, 2018 1:13 am 
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Joined: Feb Sun 02, 2014 9:13 pm
Posts: 1847
Location: Roanoke, VA
mikeC wrote:
is this an adequate substitution?

I would be inclined to say no because its current rating is significantly less than the original, but to be sure you would need to know how much current there was through the original.

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http://plymouthcolony.net/starcity/radios/


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Mon 10, 2018 12:52 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4988
Location: Rochester NY USA
I really don't think a turntable motor would draw more than an amp. Running current can be measured easily enough, or you could measure the DC resistance of the winding to determine the maximum inrush current.


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Tue 11, 2018 12:38 am 
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Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
thank you, fellas
tough finding a suitable toggle w/ such a long neck .. replacement should be here by weekend, i'll report back.
tom, my instincts are you're correct ; )
best,
mike


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Thu 13, 2018 7:12 am 
Member

Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
replacement toggle working fine ...

even <before> replacing switch, when i toggle fairchild on or off, i'm getting a very loud POP ... any suggestions where to look for this issue?

thank you, all
mike


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Fri 14, 2018 12:19 am 
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Joined: May Fri 01, 2009 3:53 am
Posts: 1460
Location: Glendale, California
Maybe try putting a capacitor across the switch contacts?

_________________
Recently unemployed Analog Meter Technician. Simpson 260 specialist.

John, KK6WHY


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Fri 14, 2018 12:33 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4496
Location: NJ, 07645
mikeC wrote:
it's a Und Lab 3A 250v / 6A 125V w/ an extended 1" neck

I just purchased 2 of these with the same ratings as above. ACE Hardware sells these. I ordered from an online dealer a couple of months ago. I don't recall offhand who. If you want, PM me and I will try to lookup where I got them.


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Fri 14, 2018 3:23 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4988
Location: Rochester NY USA
0.1 or 0.047 uF cap in series with 100 Ohm resistor across the switch contacts should kill the pop - these are available as a single component - search for "snubber". Cap alone may do the job.


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sat 15, 2018 1:11 am 
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Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
thank you, fellas

scott, toggle i received seems to be working fine.

tom, cwr, .047 alone did the trick!

thanks again all,
mike


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sat 15, 2018 5:46 am 
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Joined: May Fri 01, 2009 3:53 am
Posts: 1460
Location: Glendale, California
Good. Make sure to use an X rated safety capacitor.

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Recently unemployed Analog Meter Technician. Simpson 260 specialist.

John, KK6WHY


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sat 15, 2018 2:19 pm 
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Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
i've got a .047 400v orange drop in there ..
that ok?
TU!
m


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Sun 16, 2018 8:50 am 
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Joined: May Fri 01, 2009 3:53 am
Posts: 1460
Location: Glendale, California
Negative. I would categorize a capacitor across a power switch in the same category of one across the power line. When the switch is open, the full line voltage appears across the capacitor.

See here:
https://www.justradios.com/safetytips.html
And Here:
https://www.allaboutcircuits.com/techni ... apacitors/

_________________
Recently unemployed Analog Meter Technician. Simpson 260 specialist.

John, KK6WHY


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Mon 17, 2018 7:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4129
Location: Boston, MA USA
So what if the capacitor should short out? The motor will run -- no damage. But because of the inductive spike when the motor is switched off the capacitor needs a very high working voltage. The usual capacitor used in this application is a ceramic disc rated at 1 or 2kV.

-David


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 Post subject: Re: Toggle switch rating Q ...
PostPosted: Sep Fri 21, 2018 12:50 pm 
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Joined: Nov Sat 22, 2008 5:14 am
Posts: 64
Location: Framingham, Ma
just reading this, fellas, thanks
m


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