23
52
53
d. Slide the LDR into the other end of the heat-shrink tubing until it is touching the LED (54).
Rotate the LDR to put the leads in the same plane as the LED leads (55).
54
55
e. As you hold the LDR from the outside of the heat-shrink, carefully heat this side of the tube
until it closes around the LDR leads (56,57). While it is still very hot, use your pliers to pinch
the end closed around the LDR leads (58,59).
56
57
58
59
f. Repeat this process to make the second optocoupler.
