Automatic guesser. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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The machine will accurately name two single-digit numbers you have conceived, if you enter the result of the following operations into the machine. Multiply the first conceived number by 5, add 8 to the result, double the sum and add the second conceived number to the result. Denoting the intended numbers through henna, these operations can be written as:
(5x + 8)2 + y = 10x + y + 16.
This shows that the result of the calculations is always greater than the sum by 16 units. Thus, if 16 units are subtracted from the result obtained, a two-digit number is obtained, in which the number of tens is equal to the first conceived number, and the number of units is the second.
The machine is designed so that when the switches set the result of calculations, the indicators display a number that is 16 units less than the entered one. It is easy to see this if, after the calculations done with the intended numbers, we trace the path of the current through the switches when setting the number - the result of the calculations. The machine is powered by AC mains.
Digital indicators are fed with pulsating current after rectification by diode V2. Another similar rectifier on diode V1 is used to power the winding of relay K1. This winding is energized through switch S3.1 if the number of ones in the calculation does not exceed five. The relay must have nine groups of changeover contacts.
You can use several relays (for example, three RES-22 relays) by connecting their windings in series and selecting the operation current with resistor R2. 11-position rotary switches, S2 type 11P1N and S1 type 11P2N.
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