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Old 6th November 2019, 08:47 PM   #1
fanaticz is offline fanaticz
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Default 230vac to 15vac

I have two speaker protection boards by JLester which needs 15VAC 1A each.

What do I need? I believe it's enough with a transformer that has 15VAC secondary, and no other components what so ever. But I ask because I'm not sure. No diodes , protection, anything?
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Old 6th November 2019, 08:59 PM   #2
MarcelvdG is offline MarcelvdG  Netherlands
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You would probably need a fuse to ensure your house won't burn down if the transformer or the speaker protection board should develop a short circuit.
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Old 6th November 2019, 09:02 PM   #3
fanaticz is offline fanaticz
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Haha, I figured, but thanks for reminding me. I was just curious if the transformer itself actually is enough. My ignorance feels like something else is missing.
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Old 6th November 2019, 09:13 PM   #4
PRR is offline PRR  United States
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To keep it simple: Yes, if you have 230VAC and the load wants 15VAC, you only need a 230VAC:15VAC transformer of appropriate size.

To also keep you safe, you want a fuse so a fault does not heat-up your line cord, set the carpet on fire, burn-up your house. And a box so your child/cat does not touch live wires. You may also want a switch. In some lands a commercial product must use a 2-pole switch. If the box is metal (plastic boxes should be Approved for hiding live wires, so not a cookie-tray) and you have a 3rd pin (PE, green wire) on your wall outlet, there should be a substantial bond from wall 3rd pin to bare metal on the box, so a loose wire will blow the fuse in the basement before anybody gets shocked.
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Old 6th November 2019, 11:39 PM   #5
MAAC0 is offline MAAC0  Portugal
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Are there regulators on board ? Perhaps You will need not 15V AC, but slightly a couple of Volts more in order for them to work. For example a 7815 needs more 3V on the input.
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Old 7th November 2019, 04:32 PM   #6
DF96 is offline DF96  England
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He says the circuit needs 15V AC. If that is what the designer has asked for then he will already have taken account of what the DC arrangements are.
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Old 7th November 2019, 04:46 PM   #7
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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A transformer rated for 15VA (15V, 1A) will not burn any house still under shortcircuit conditions. The finest of the primary winding will act as a self fuse. In any case, external fusing and or a thermal cutout is recommended.
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Old 12th November 2019, 08:28 PM   #8
CBS240 is offline CBS240  United States
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Always provide a disconnect. I'm sure even the 15VAC transformer costs more than a fuse. Also, there are better smells than that provided by burnt insulation.
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