you need
  • - 8 galvanic cells;
  • - 10 small-size batteries;
  • - AC step-down transformer to 12 volts;
  • - the power cord;
  • - connecting wires.
For DC voltage of 12 volts from the battery cells connect them in series of 8 pieces.Connect the positive terminal of one cell to the negative terminal of the next.The two extremes of the resulting output, connect the battery to the consumer current.Observe the polarity.For larger total capacity of the battery assemble multiple single cells of the 8 electrochemical cells.Then connect the battery resulting in parallel.To do this, connect only the extreme conclusions of si
ngle cells to each other, the positive terminal to the positive terminal of the other battery minus to the negative terminal.
For voltage source of 12 volts of small nickel-cadmium or nickel-metal hydride batteries, connect them in series of 10 pieces, because, in contrast to the galvanic cells, batteries develop a voltage of 1.2 volts.Connect the batteries should be the same as the galvanic cells.The advantage of batteries is that they have a greater capacity and are reusable power sources.
For AC power voltage 12 V AC, use a step-down transformer with a secondary voltage of 12 volts.Connect the power cord to the transformer primary.Consumer AC plug to the secondary (output) side of the transformer.The transformer must provide a current exceeding the maximum load by 30%.