Toilet Pointer

by R Kambach It often happens on parties that numerous guests are at a loss in finding the toilet, and politely but urgently require to be given directions to that effect. The ful to many, since it captures the attention by successively light- ing LEDs that are arranged to form an arrow. The circuit is based on a single Type 4049 integrated circuit, which con- tains six CMOS inverters. Each of these has an R-C network at its output to ensure an appro- priate delay before enabling the next inverter. The outputs of the chip are capable of driving one LED direct, although some heating is expected to arise from this. The circuit is con- veniently fed from a PP3 (9 V) battery, and consumes a mere 50 mA. Th TOILET POINTER SUPPLEMENT 19