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Switches ratings and adding leds
Switches ratings and adding leds
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Old 4th September 2019, 09:49 AM   #1
akkar is offline akkar  Italy
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Default Switches ratings and adding leds

Hello everyone!

The tonestack in my new project is basically the Dumble overdrive spec one.

Click the image to open in full size.

I'd like to add some leds to the switches circled in red. How would you do that?

Also can I use small pushbuttons rated 0.4VA @ 28VAC?

Thanks
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Old 4th September 2019, 10:49 AM   #2
DF96 is offline DF96  England
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I assume you mean 0.4A @ 28VAC. Yes, they should be fine for switching audio provided there is no large DC standing voltage too.

To add an LED you need an extra pole on the switch to switch the LED supply. Some switches may have an LED built-in.
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Old 4th September 2019, 10:54 AM   #3
akkar is offline akkar  Italy
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No it's 0.4VA

See here
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Old 4th September 2019, 03:42 PM   #4
DF96 is offline DF96  England
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OK. I didn't know switches that small were made.
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Old 4th September 2019, 04:50 PM   #5
Frank Berry is offline Frank Berry  United States
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You would need an additional switch section to power the LED.
For SW2 and SW4, you would need a DPST switch.
For SW3, you would need a 3PDT switch.
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Old 5th September 2019, 08:37 AM   #6
akkar is offline akkar  Italy
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Thanks for the suggestions!

Quote:
Originally Posted by DF96 View Post
OK. I didn't know switches that small were made.
But even 0,4VA would be enough for switching in those position, right?


Another thing about choosing the right component for the front control panel (pots, switches, jacks...).
I was planning to use a pcb there too (vertical or horizontal), but I realize now that it is very difficult to find components that once installed on the pcb will align on the frontal panel horizontal axis (center of the knobs aligned with center of jacks...).

how do people usually solve this?
Simply not using a pcb board there but components with solder lugs and using wires to the main board?

Thanks
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Old 5th September 2019, 11:54 AM   #7
DF96 is offline DF96  England
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You need to design the PCB with specific components in mind. The datasheets will give you the information you need to do this. Alternatively, take the controls off the PCB and wire them to it.
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Old 5th September 2019, 12:04 PM   #8
akkar is offline akkar  Italy
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Yes is that what I mean, it's very difficult to find components with same horizontal axis when mounted.
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Old 5th September 2019, 01:47 PM   #9
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by akkar View Post

Another thing about choosing the right component for the front control panel (pots, switches, jacks...).
I was planning to use a pcb there too (vertical or horizontal), but I realize now that it is very difficult to find components that once installed on the pcb will align on the frontal panel horizontal axis (center of the knobs aligned with center of jacks...).

how do people usually solve this?
Simply not using a pcb board there but components with solder lugs and using wires to the main board?

Thanks
The best way to align components with holes and a pcb is to put all the components through the holes on the panel loosely then put pcb over components, tighten components and then solder.
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Last edited by nigelwright7557; 5th September 2019 at 01:50 PM.
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Old 5th September 2019, 02:45 PM   #10
akkar is offline akkar  Italy
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Ok, but what I mean is finding components that once installed are at the same height.

Click the image to open in full size.

As you can see if I align those components only pots leads can be soldered on the board, unfortunately is difficult to find for example swtiches with long leads
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