The button has to be pressed only at suitable time intervals, when the pilot LED is on. If the button is pressed in all other time intervals (eg. pilot LED off), the LEDs that have been previously light up, will switch off. As more LEDs are lighted up, the game becomes slightly more difficult and a few more button presses are needed to light up the next LED. If the button is not pressed for some time, the already switched on LEDs automatically start to switch off gradually, one after another, so you have to be quick. The switch-off rate, depends on the current LED that is switched on in the sequence.
The game provides an analogue way to select the hardness (level), by means of the 100K potentiometer in the multi-vibrator stage. This basically shortens the period that the button is allowed to be pressed, in order to light up the next LED in the sequence. Additionally, the more hard the level, the quicker the LEDs are switched off when the button is not pressed for some time.
Game sound effects, are provided by means of a negistor (negative resistor) oscillator, driving a piezoelectric speaker and related circuicity. The audio oscillator, beeps when the pilot LED is on. As more LEDs are switched on, the oscillator starts to beep when the pilot LED is off as well, but at a different frequency from the one when it is on (dual beep). This frequency is raised as more LEDs in the sequence are switched on, providing a way to play the game even without watching the LEDs.
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+12v | |
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3.9k |
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3.9k |
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1n4148 |
100k | 1n4148 |
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3.9k |
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3.9k |
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pn2907 |
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4.7k |
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3.3M |
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1n4148 |
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1n4148 |
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sw1 |
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1n4148 | |
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pn2907 |
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4.7uF |
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3.9k 3.9k |
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4.7uF |
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22k |
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470 |
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pn2222 |
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270 |
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330 |
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390 |
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470 |
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470 |
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560 |
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1k |
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100uF |
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pn2222 |
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pn2222 |
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pn2222 |
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1k |
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pn2222 |
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1k |
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pn2222 |
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4.7k |
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2.2k |
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pn2222 |
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2.2k |
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pn2222 |
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pn2222 |
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220nF |
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3.3k |
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pn2222 |
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4.7k |
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1n4148 |
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1n4148 |
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