enigma

Less energetic than musical chairs or charades, the use of this circuit can evoke just as much, if not more, humour from populous parties. The idea behind the game is to ask certain questions that can only have a "yes" or "no" answer and to produce answers which are hilariously incorrect. For instance, when the vicar is asked if it is true that he drinks fifteen pints of lager before breakfast the answer should be "yes". And "no" must be elicited from the farmer"s wife when asked to deny the rumour that she sleeps in the pig-sty. No doubt readers will be able to think of similar questions to put to their particular set of guests, but we cannot print the more obvious ones that spring to mind. The circuit shown here produces a set series of "yes" and "no" answers by lighting one of two LEDs. This set sequence is, of course, only known to the questioner. Once a question has been asked the questionee presses the pushbutton Sl. This triggers the timer contained in one half of IC1 to pr...