| Alarm kit
Two 555 timers are used to create an alarm with exit delay and auto silence.
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| Battery tester kit
Using a quad op amp, LEDs illuminate to show the remaining capacity of an AA battery.
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| Timer kit
A button starts the timer and lights an LED, after the desired period a buzzer sounds.
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| MP3 amplifier kit
This 1.6W amplifier kit works with any personal stereo equipment, including MP3 players.
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| Square wave kit
The kit uses a 555 timer in its astable mode to produce a square wave / tone.
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| 7 segment display
The 7 segment display is driven by an up down counter and a binary to 7 segment driver IC.
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| Quiz buzzer kit
Two people (or two teams) can used the quiz buzzer to show who pressed their button first.
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