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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 1st October 2017, 04:22 PM   #1
zman01 is online now zman01  Bangladesh
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Join Date: Feb 2011
Location: Dhaka
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Hi,

I was going through the gallery of Tubelab amps built by diyA members. Unfortunately some of the pics are no longer visible due to broken links.

One thing I noticed that the most common style of switches are toggle type ones. I've used rocker type switches, and I guess others use that too. What about latching switches - something like this?

22mm Waterproof 12V Self locking or Reset ring illumination Black Latching Anti vandal push button switch-in Switches from Home Improvement on Aliexpress.com | Alibaba Group

Would this be a safe/good choice? Any concerns with in-rush current or plate voltages?
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Old 2nd October 2017, 05:26 PM   #2
w5jag is online now w5jag  United States
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Join Date: Feb 2007
Location: Arkansas
I use a round rocker, with an outline LED illumination, for the AC mains on my SSE. It's been trouble free.

If you want a latch switch, that switch seems like it would be fine - it's rated for 5 amps at 220VAC, and claims 2000 volt insulation. You can get the LED ring in about any color or voltage up to 220 volts.

One thing that is a little unclear to me, is the actual operation of the LED itself. The LED in my switch runs right off the AC main voltage, without rectification. The schematic for that switch shows a series resistor, but nothing else, so you may need some additional circuitry.

Win W5AG

edit: price may be a bit high - not sure of parts availability in Bangladesh. I pay about that for a similar switch at Radio Shack. I would expect it to be a bit cheaper when the middlemen are out of the distribution system.

I guess I need to order some more - the type I use has been marked down to $2 USD from $7 USD. RadioShack SPST 125-Volt AC Illuminated Switch

Last edited by w5jag; 2nd October 2017 at 05:40 PM.
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Old 10th February 2018, 06:37 PM   #3
zman01 is online now zman01  Bangladesh
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w5jag,

Thanks for your reply, appreciate it. Sorry - had forgotten about this thread and realized that I hadn't replied to your post earlier.
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Old 2nd March 2018, 09:32 PM   #4
pitchinwedge is offline pitchinwedge  United States
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Bumping this along...

Would like to add a power switch/button on the front panel. This is in addition to a switched IEC power entry module at the rear of the chassis. What's the required spec for the power switch and IEC module? I'm in the US, so I suppose anything rated at over 120VAC would work. But how many amps min? 2A? 5A? More?

Interestingly, there are tons of cool push-button switches that run low DC voltage and amps. Probably unrealistic, but might there be a practical way to use one of these? Perhaps with a SS relay or something?
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Old 2nd March 2018, 09:51 PM   #5
mkane77g is offline mkane77g  United States
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3 should do it
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Old 3rd March 2018, 08:57 AM   #6
muskyhuntr is offline muskyhuntr  United States
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Check out AMB's switch driver. I have built a couple. Very elegant solution!
The ε24 power switch driver circuit

Me
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Old 3rd March 2018, 08:58 AM   #7
muskyhuntr is offline muskyhuntr  United States
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Check out AMB's switch driver. I have built a couple. Very elegant solution!
The ε24 power switch driver circuit

Me
__________________
Used, abused, and confused husband of....
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Old 3rd March 2018, 05:07 PM   #8
zman01 is online now zman01  Bangladesh
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Join Date: Feb 2011
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Quote:
Originally Posted by muskyhuntr View Post
Check out AMB's switch driver. I have built a couple. Very elegant solution!
The ε24 power switch driver circuit

Me
muskyhuntr - looks like the AMB Epsilon24 uses momentary switches and not latching switches?
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Old 3rd March 2018, 07:22 PM   #9
pitchinwedge is offline pitchinwedge  United States
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Quote:
Originally Posted by muskyhuntr View Post
Check out AMB's switch driver. I have built a couple. Very elegant solution!
The ε24 power switch driver circuit

Me
Quote:
Originally Posted by zman01 View Post
muskyhuntr - looks like the AMB Epsilon24 uses momentary switches and not latching switches?
The e24 looks like a great solution. I had a cool button in mind, but after looking at the dimensions more carefully, it won't mount on a 10mm thick panel. This button and other like it are designed to fit ~6mm max. I suppose one solution is to machine the backside of the panel and thin out the mounting area to 6mm or less, but the extra cost and complexity has just about killed this idea.

On the other hand, I saw a post where someone used a version of one of these: MSM LA 19 - Metal Switch, Latching Action, Switching Voltage up to 125 VDC / 250 VAC

Switching voltage up to 250VAC and switching current up to 16A. Seems like it should have worked. With a lot less effort. Would a latching SPDT variant do the trick?
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Old 8th March 2018, 08:30 PM   #10
pitchinwedge is offline pitchinwedge  United States
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Quote:
Originally Posted by pitchinwedge View Post
I'm in the US, so I suppose anything rated at over 120VAC would work. But how many amps min? 2A? 5A? More?
Quote:
Originally Posted by mkane77g View Post
3 should do it
I've finally found a larger diameter latching pushbutton switch. It's rated at 5A/240VAC. Good to go?

Everyone using 10A rockers is making me nervous and second guess. Thanks.
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