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Old 07-08-2022, 08:17 PM
Scaredyburst Scaredyburst is offline
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Default Re: Quieting a matress pump/air pump?
Up until about the 1990s, the rectified mains was used by almost every television in the world. The supply companies didn't like it, but there was nothing they could do.

Much nicer would be to use a lamp dimmer (for an old fashioned filament lamp), provided the dimmer has a sufficient power rating. It will give a variable power to the pump, an advantage.
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Old 07-08-2022, 09:08 PM
heleo heleo is offline
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Default Re: Quieting a matress pump/air pump?
Originally Posted by Scaredyburst View Post
Up until about the 1990s, the rectified mains was used by almost every television in the world. The supply companies didn't like it, but there was nothing they could do.

Much nicer would be to use a lamp dimmer (for an old fashioned filament lamp), provided the dimmer has a sufficient power rating. It will give a variable power to the pump, an advantage.
Hi,
It was a full wave recitifer, so it would take current from the both +VE and -VE parts of the mains cycle and thus have no signifcant DC component.
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Old 08-08-2022, 12:09 PM
lnr13 lnr13 is offline
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Default Re: Quieting a matress pump/air pump?
Originally Posted by heleo View Post
It is highy illegal to use the circuit you have suggested, you may have confused it with triac phase control. I do have a degree in electrical power enginering.

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Originally Posted by heleo View Post
It must be a device that has not been certified. DC components cause significant issues for the supply company.
Hello, in Spain this is not illegal. I do not know if in other countries it can be, as I understand that it will also depend on the electrical infrastructure available.

What is penalized in Spain is the reactive energy that comes from motors and other coils and that force to use capacitors to compensate it. Although this only affects industries. In homes this is not penalized either.

In any case it is a method that works for practical purposes and regardless of whether it is well or badly seen in the face of the electric company, nothing happens to use it for a while ...
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