The one on the left is as it’s connected to the TL594 IC. Pin 14 is the 5v output of the TL594. Pin 15 is the ‘inverting’ input. Note:The term ‘winding’ refers to a group of turns/wraps around the core of the transformer. This image allows you to better see the connections for the transformer. As you can see, there are three strands of wire that make up the primary windings.
This means that they will not need to install the components for the IC regulators, the pre-regulators or the greater-than-rail supplies. As an example, the following image shows the basic components needed for basic operation. Braid that’s old will have oxidized and will not readily wick the solder . If you do find that your braid has oxidized, you can use it with paste or liquid flux to make it more efficiently wick the solder from the board. Like the fan control circuit, this circuit uses a thermistor and a resistor to form a voltage divider. As the temperature increases, the thermistor’s resistance decreases and pulls the voltage up at the point where the thermistor and the resistor connect.
Pin 6: This pin is for the timing resistor (Rt). The timing resistor is connected from this pin to ground. There are two tools that make this easier. This essentially doubles the inductance per number of turns.