PARTS LIST ---------------------------- TX Radio Shack 63-883 Clock/Timer K1 " " 275-218c 12VDC relay (75ma/160ohm coil 10A@30VDC) Q1 Transistor, 2N3904 (NPN) D1 Diode, 1N4001 (1A/50PIV) D2 Diode, 1N5406 (3A/600PIV) Z1 Zener Diode, 1N5341 (6V) R1 Resistor, 1000 ohm, 1/4W R2 Resistor, 4700 ohm, 1/4W R3 Trimpot, 10,000 ohm, linear R4 Resistor, 15 ohm, 25W (or 12 volt lamp) S1,2 Switch, DPST, N.O. F1 Fuse, 3A, AGC (with matching holder) Box, suitable in size. Must be sufficiently ventilated for heat from load resistor. Alternatively, the load could be outside the box.