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7 segment display

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tzk1994

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I have this project that requires me to create a RC timer circuit. i have built the circuit using a selector switch in which when R1 is connected to the 100uF capacitor a time delay of 1 min is created. when R2 is connected to the 100uF capacitor a time delay of 2min is created. a led lights up when the timing is up.
anyone have any suggestions on how i can enhance my circuit.i cannot use ic. my friend made a astable circuit as his enhancement to make the led blink and the buzzer produce a blinking sound.
 
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