I'm new to this community and starting with EE. I am trying to create a portable set of speakers using some old speakers with UK Plug.

Speakers Rating: 230V 50Hz 0.3A

My current understanding from some research is that I would need:

  • Battery box
  • 1 sealed rechargeable battery
  • Auxiliary Socket
  • Power Inverter (UK W/ UK plug)
  • Switch

So the idea for wiring this would be:

Something Like this

Please ignore the messy wiring example.

Could anyone help confirm is this the way to do it ?

One more question... What connector do I use for this:

What connector?

Thanks in advance!

  • \$\begingroup\$ This whole bunch of hardware will be much more expensive, heavy and less safe than an off-the-shelf portable speaker of the same performance... \$\endgroup\$ – Eugene Sh. May 12 '16 at 21:55
  • \$\begingroup\$ You left the inverter out of your drawing, and the voltmeter should go between the + and - wires, not in series with the load. I assume your old speakers include amplifiers? The battery connectors are commonly called "Faston(tm)" or 1/4" tab. \$\endgroup\$ – Peter Bennett May 12 '16 at 21:58

Speakers Rating: 230V 50Hz 0.3A

Not quite right. You are describing a combined amplifier and speaker unit. The amplifier is powered by 230 V mains. The speakers are powered by the audio amplifier.

The mains power will be transformed into low voltage DC inside the speakers and this DC power will feed the amplifier circuit. (It may even be 12 V DC internally.) Your plan to use and inverter to step up from 12 V to mains and then have the amplifier step it down again is inefficient, complex and adds weight. A better option for someone with the skills would be to measure the internal DC voltage and see if the unit can be modified to run of either mains or battery.

In your case it would be better to purchase a powered speaker set with an external 12 V power supply. This could be replaced by the battery when required.

What connector do I use for this?

1/4" spade connectors available from motor factors.


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