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Between each winding, electrical tapes of various kinds are applied, to provide adequate insulation, and prevent shorting of turns. This provides for an extra degree of safety to isolate the primary and secondary side of the transformer windings with respect to PCB connections and tracks. All the three primary side windings (mains, 230V side) are connected to pins on one side of the bobbin, and all the low voltage secondary side windings are on the other side. The pins are on the other side of this view. That is as you see it from top of the PCB. The diagram along-side shows the winding details for our house-keeping transformer. The most important thing to follow is the dot-convention. Ferrite Core and Bobbin for use in housekeeping supply Material required: Tapes and Glue Preliminaries: The following diagram illustrates the winding details of the transformer. Material required: The following materials are required to wind this transformer: 1) EE 25x7 Ferrite core 2) Bobbin (horizontal : implying the core lies horizontally) for this core 3) Wire: 35 SWG (Standard Wire Gauge) enameled wire, or dual coated wire 4) Cello-tape (10-12mm width) or Taco Tape 5) PVC insulating tape for SMPS design (5mm wide roll) 6) Teflon tape – used by plumbers – available at any hardware store 7) Fevikwik or any equivalent cyano-acrilite adhesive 8) Glue stick pieces – for securing the winding in certain steps 9) Tools: Thin triangular file, knife, soldering iron/solder wire. Typical currents drawn from the supply: So the total power provided is approximately 5Watts.
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In this particular example the transformer output generates a +5V, +9V, -9V and another isolated (with respect to the these three supplies) power supply of +5V. The input and output sections/windings are completely isolated with respect to each other. Power levels up to a couple of watts can be supplied by this transformer. This transformer is used in a blocking-oscillator configuration to generate the relevant low voltages required to run chips on a typical PCB design. Such transformers have been used on PCBs.
#Ns2 np2 how to#
Introduction: This document illustrates how to wind the transformer used to obtain house-keeping power supply voltages on typical small circuits.
#Ns2 np2 pdf#
Winding house-keeping power-supply transformer (manual procedure) Please find pdf version here.