Who had one of these as a kid?
Build a drum/percussion sound generator using only the components available in the kit. You even get an NPN, two PNPs and that integrated circuit-thing to work with. Those transformers might be useful. Bonus points for using the relay or the 7 segment display.
Here's my entry it's sort of like a Synare synth-tom.
Version 4 SHEET 1 2664 1268 WIRE -816 -976 -816 -1024 WIRE 1376 -896 1376 -1024 WIRE 1376 -896 736 -896 WIRE 1840 -896 1376 -896 WIRE -816 -816 -816 -896 WIRE 736 -784 736 -896 WIRE -384 -672 -384 -1024 WIRE -384 -672 -768 -672 WIRE 0 -672 -384 -672 WIRE 1376 -656 1376 -896 WIRE 736 -608 736 -720 WIRE 1312 -608 736 -608 WIRE 1376 -464 1376 -560 WIRE -768 -448 -768 -672 WIRE -384 -448 -384 -672 WIRE 0 -448 0 -672 WIRE 736 -432 736 -608 WIRE 1376 -256 1376 -384 WIRE 1376 -256 992 -256 WIRE 736 -192 736 -352 WIRE -384 -176 -384 -368 WIRE -384 -176 -480 -176 WIRE -272 -176 -384 -176 WIRE 992 -144 992 -256 WIRE -768 -128 -768 -368 WIRE -544 -128 -768 -128 WIRE 0 -128 0 -368 WIRE 0 -128 -208 -128 WIRE 224 -128 0 -128 WIRE 560 -128 224 -128 WIRE 0 -32 0 -128 WIRE 224 -16 224 -128 WIRE -768 16 -768 -128 WIRE 1376 16 1376 -256 WIRE 992 64 992 -64 WIRE 1312 64 992 64 WIRE 1840 64 1840 -896 WIRE -272 112 -272 -80 WIRE 368 112 -272 112 WIRE 720 112 368 112 WIRE 928 112 720 112 WIRE 1776 112 1376 112 WIRE 720 272 720 112 WIRE 1216 272 720 272 WIRE 1600 272 1296 272 WIRE 1840 272 1840 160 WIRE 1840 272 1600 272 WIRE 2032 272 1840 272 WIRE 2240 272 2096 272 WIRE 2304 272 2240 272 WIRE -768 288 -768 96 WIRE -480 288 -480 -80 WIRE 0 288 0 48 WIRE 224 288 224 48 WIRE 368 336 368 112 WIRE 992 352 992 160 WIRE 1840 448 1840 272 WIRE 2240 448 2240 272 WIRE 992 560 992 432 WIRE 368 656 368 416 WIRE 560 688 560 -128 WIRE 912 688 560 688 WIRE 1376 688 976 688 WIRE 1600 688 1600 272 WIRE 1600 688 1456 688 WIRE 2240 688 2240 528 WIRE 1840 704 1840 528 FLAG -816 -816 0 FLAG -816 -1024 Vcc FLAG -384 -1024 Vcc FLAG -480 288 0 FLAG -768 288 0 FLAG 0 288 0 FLAG 368 656 0 FLAG 224 288 0 FLAG 992 560 0 FLAG 736 -192 0 FLAG 1376 -1024 Vcc FLAG 2240 688 0 FLAG 2304 272 OUT IOPIN 2304 272 Out FLAG 1840 704 0 SYMBOL npn 928 64 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL npn 1312 16 R0 SYMATTR InstName Q2 SYMATTR Value 2N2222 SYMBOL npn 1776 64 R0 SYMATTR InstName Q3 SYMATTR Value 2N2222 SYMBOL res 1312 256 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 5.6k SYMBOL res 976 -160 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL res 1360 -480 R0 SYMATTR InstName R4 SYMATTR Value 8.2k SYMBOL voltage -816 -992 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 9 SYMBOL pnp -208 -80 R180 SYMATTR InstName Q4 SYMATTR Value 2N2907 SYMBOL pnp -544 -80 M180 SYMATTR InstName Q5 SYMATTR Value 2N2907 SYMBOL res -784 0 R0 SYMATTR InstName R7 SYMATTR Value 10k SYMBOL res -16 -48 R0 SYMATTR InstName R8 SYMATTR Value 10k SYMBOL res -784 -464 R0 SYMATTR InstName R10 SYMATTR Value 10k SYMBOL res 352 320 R0 SYMATTR InstName R11 SYMATTR Value 2.2k SYMBOL cap 976 672 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2
SYMBOL cap 208 -16 R0 SYMATTR InstName C3
SYMBOL res -400 -464 R0 SYMATTR InstName R6 SYMATTR Value 22k SYMBOL res 1472 672 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 4.7k SYMBOL npn 1312 -656 R0 SYMATTR InstName Q6 SYMATTR Value 2N2222 SYMBOL res 720 -448 R0 SYMATTR InstName R14 SYMATTR Value 100k SYMBOL cap 720 -784 R0 SYMATTR InstName C1
SYMBOL cap 2096 256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4
SYMBOL res 2224 432 R0 SYMATTR InstName R15 SYMATTR Value 47k SYMBOL res 976 336 R0 SYMATTR InstName R13 SYMATTR Value 220 SYMBOL res 1824 432 R0 SYMATTR InstName R5 SYMATTR Value 750 SYMBOL res -16 -464 R0 SYMATTR InstName R3 SYMATTR Value 10k TEXT -728 -936 Left 2 !.tran 1 TEXT 544 -608 Left 2 !.ic V(n001) = 9 TEXT 1976 160 Left 2 !.wave "C:/out.wav" 16 44100 out