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"WHAMMY" Pass DIY headphone amp guide
"WHAMMY" Pass DIY headphone amp guide
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Old 16th August 2019, 06:26 AM   #1551
HatlessChimp is offline HatlessChimp
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Do you think using a soft start with the whammy is a bit excessive? I have one of those push button switches from Aliexpress but not sure if I want to use it to switch 240VAC.20190816_161838.jpg20190816_162358.jpg20190816_162411.jpg20190816_162424.jpg
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Old 16th August 2019, 07:15 AM   #1552
osscar is offline osscar  Latvia
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I often use these switches - I've never had a problem. But someone told me about an internal short circuit when mains burns PSU through led wires...
I use it in my whammy. you can use a switch, but the indicator led can be placed separately if there is a fear of short circuit.
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My DIY so far: two Leach amps,two Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, MF A1 Clone, Whammy headphone amp.
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Old 16th August 2019, 07:45 AM   #1553
silasmellor is offline silasmellor  Denmark
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"WHAMMY" Pass DIY headphone amp guide
I dont think a soft start is anywhere near necessary for this.
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Old 16th August 2019, 07:50 AM   #1554
HatlessChimp is offline HatlessChimp
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Originally Posted by silasmellor View Post
I dont think a soft start is anywhere near necessary for this.
I had a think about it and yeah it's a waste. Just had the board laying around and thought I could put it to use.
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Old 16th August 2019, 09:56 AM   #1555
penmarker is offline penmarker  Malaysia
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Quote:
Originally Posted by HatlessChimp View Post
Do you think using a soft start with the whammy is a bit excessive? I have one of those push button switches from Aliexpress but not sure if I want to use it to switch 240VAC.Attachment 775579Attachment 775580Attachment 775581Attachment 775582
Just a word of caution, I used one of those switches for my NAP200 build and after about 2 years it shorted and wouldn't switch off. Nothing bad came of it, just that I can't switch it off.

In retrospect it seems quite dangerous that something so cheap is tasked to handle mains voltage. Don't know how on earth they stepped it down to 12V (probably) for the LED in the switch too.
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Old 16th August 2019, 09:59 AM   #1556
HatlessChimp is offline HatlessChimp
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Quote:
Originally Posted by penmarker View Post
Just a word of caution, I used one of those switches for my NAP200 build and after about 2 years it shorted and wouldn't switch off. Nothing bad came of it, just that I can't switch it off.



In retrospect it seems quite dangerous that something so cheap is tasked to handle mains voltage. Don't know how on earth they stepped it down to 12V (probably) for the LED in the switch too.
I'm thinking about using it on another project instead.
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Old 16th August 2019, 11:20 AM   #1557
chede is offline chede  Germany
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"WHAMMY" Pass DIY headphone amp guide
These push-button switches ("vandalism-proof switches") are not all created equal.
There are ones that are rated up to 5A at 240V, and that have 12V or 24V input for the LED. They tend to cost around 20 EUR here in Europe. I use them in most of my amp builds. Never had any problems with them so far, after a few years of use.

What I do though, is wiring a small ceramic cap (10 nF - 100nF) across the switch contacts in order to avoid erosion of the contacts through possible switch-off sparks.

Best regards, Claas
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Old 16th August 2019, 01:30 PM   #1558
labjr is offline labjr  United States
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I think it needs a three phase mag starter capable of at least 100 amps!
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Old 16th August 2019, 02:02 PM   #1559
chede is offline chede  Germany
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... or a wimpy, bog-standard switch and a CL-60 behind it ...
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Old 16th August 2019, 02:03 PM   #1560
PC997 is offline PC997
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Quote:
Originally Posted by HatlessChimp View Post
Do you think using a soft start with the whammy is a bit excessive? I have one of those push button switches from Aliexpress but not sure if I want to use it to switch 240VAC.Attachment 775579Attachment 775580Attachment 775581Attachment 775582
I use those switches also. Haven't had any issues.

What chassis are you using? Looks interesting.
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