Universal battery 1,5-12 volts
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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At work and at home, there is often a need for galvanic power supplies with a stepped gradation of EMF (including a symmetrical polar voltage). Often this is a "standard" series: from ± 1,5 to 12 V. In such cases, a home-made cassette is very useful, allowing you to quickly assemble a battery of two, four, six or eight galvanic cells of type 373 ("Mars", "Orion") .
This device also works well in tandem with a rectifier for recharging a run-down "electroplating", and an ONTS-type electrical socket (or lamp socket) mounted in the cassette cover completely eliminates errors when connecting galvanic cells to one or another electrical circuit.
The cassette body is made from a sheet 230x185x1 mm, and each of the shells is made from blanks 190x58x1 mm. The starting material is tinplate.
Forming of the body and shells is achieved using a pair of columns of elements 373, pre-wrapped in several layers of paper to provide a technological gap between the "electroplating" and the cassette. The soldering of the longitudinal seam in each of the tin parts is carried out with an overlap, and the M4 nuts, located on the inside of the body opposite the holes with a diameter of 4,2 mm, along the perimeter. There are similar holes in the shells.
Tinplate is preferable as the material of the cover and bottom soldered to the respective shells. But galvanized roofing iron is also acceptable. Coinciding in contour with the bottom, the cover is distinguished by a large central and two small side holes for fixing an electrical socket of the ONC type (or a lamp socket).
Universal battery of galvanic cells and scheme of its use (click to enlarge): 1 - case; 2 - shell (2 pcs.); 3 - galvanic element (2,4,6 or 8 pieces); 4 - contact spring (2 pcs.); 5 - contact panel, bottom; 6 - wire "zero"; 7 - bottom; 8 - contact panel, top; 9 - thrust pin; 10 - wire "polar" (2 pcs.); 11 - cover; 12 - M3 bolt (2 pcs.); 13 - electrical socket; 14 - M4 bolt (2 pcs.); 15 - nut M4 (2 pcs.); parts materials 1,2,7,11 - tinplate s0,5; 5 and 8 - foil getinaks or textolite s1,5; 6 and 10 - MGShV-1,5 wire. The U-shaped stopper, which is installed depending on the number of galvanic cells to be switched on, as well as the longitudinal seam on parts 1 and 2, are conventionally not shown.
The lower contact panel is sawn out of foil-coated 1,5 mm getinax or textolite. Its elliptical contour is smaller than the "bottom" and fits into the dimensions of 65x34 mm. The areas that provide electrical contact with the spring and the "plus" of the galvanic cell are tinned.
The top contact panel is made similarly to the bottom one. But she's a little big. In addition, there is a dividing cut of the conductive layer and a side cutout for the passage of three wires of the MGSHV-1,5 type. With its insulated side, this panel rests on two rods, which are made of steel wire with a diameter of 3 mm and soldered into the corresponding shell.
Options for switching on galvanic cells are shown in the circuit diagram. Depending on the required supply voltage, the number of pairs of energy sources that will work on the load is selected, and the rest, located below, are removed from the cassette. Then the lower contact panel is docked to the remaining ones and pressed from the insulated (rear) side with a U-shaped bracket or two locking rods with M3 nuts at the ends (the latter are not shown in the figure). The cassette with a battery of galvanic cells is closed with a lid.
Author: Yu.Sergeev
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