RedCore R-4 User Manual download pdf (Page 4)

up. The 1/8” holes can be drilled in 1 step, but the others should be done in 3 or 4 steps. Once you

have the top of the case drilled it is time to start.

Populating the Board:

The circuit board in your kit is a very high quality professional board. It has plated through holes

and a silk screen and solder mask. The first thing that we want to do is wind the toroids for the

kit. We will wind all of them at the same time.

There are 3 different toroids in your kit, one T-50-2 which is the larger red one, four T37-2 which

are the smaller red cores, and one Ft37-43, which is the small all black one. Winding a toroid is

very easy and I find it quite relaxing. Let’s wind the big one first. You will need to put 40 turns

of wire on this one, and leave about 1 inch for the leads to be soldered into the board. Cut a piece

of the red wire 28 inches long. Then, take the core in your left hand, the wire in your right hand,

and put the wire up through the core and extend it about 1 inch. Hold the wire against the core

with your left thumb. Now you have put 1 turn on the core, because every time that the wire

passes through the core counts as 1 turn. Next, grab the other end of the wire and wrap around

the core and put it through the middle from above. Now you have two turns, and the core should

look like Fig. 1.

Figure 1

Continue winding until you have 40 turns on the toroid. Trim the lead to about 1 inch, and you

should have a toroid that looks like the one in figure 2.

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RedCore R-4 User Manual Page 4