User guide

199. RANDOM ACCESS DISPLAY 121
200. DECADE COUNTER 121
201. BCD COUNTER WITH DISPLAY 122
202. OCTAL COUNTER WITH LINE DECODER 122
203. OCTAL COUNTER WITH DISPLAY 123
204. DECADE COUNTER WITH DISPLAY 123
205. DECADE COUNTER WITH DISPLAY II 124
206. BCD TO 7-SEGMENT DECODER 124
13) Amusement in Digital Land
207. VCO BY NOR GATE 125
208. PULSE-DELAYED CIRCUIT 125
209. NAND GATET ONE GENERATQR 126
210. TRANSISTOR TIMER 126
211. NOISE-SIGNAL DISCRIMINATOR 127
212. PULSE STRETCHER 127
213. BIDIRECTIONAL BUFFER 128
214. VARIOUS INVERTERS 128
215. ELECTRONIC SWITCH 129
216. TONE BURST GENERATOR 129
217. DIGITALTIMER 130
218. DIGITAL TIMER II 130
219. TEN COUNT BUZZER 131
220. PRESS FIRST 131
221. TARGETRANGE 132
222. CATCH THE EIGHT 132
223. SOS ALERT 133
224. WHEEL OF FORTUNE 133
225. LEAPIN LEDS 134
14) Surprise and Fun Revisited
226. EXPERIMENT OF ELECTROMAGNETIC INDUCTION 134
227. ELECTRONIC CANDLE 135
228. CONSTANT CURRENT CIRCUIT 125
229. A PHONY COUNTER 136
230. ALPHABET FLASHER 136
231. WINKING LEDS 137
233. DELAYED TIMER II 137
234. VOICE LEVEL METER 138
225 CROSSING SIGNAL 139
236 OCTAVE GENERATOR 139
237. BUZZIN LED 140
238. SON OF BUZZIN LED 140
239. SOUND OUT TIMER 141
240. SOUND STOP 141
241. BIG MOUTH! 142
242. LIGHT OR SOUND 142
243. BE YOUR OWN MULTIVIBRATOR 143
244. ANTICIPATION 143
245. SET/RESET MATCH 144
15) Testing and Measuring Circuits
246. CIRCUIT CONTINUITY CHECKER 144
247. ACOUSTIC OHMMETER 145
248. AUDIO SIGNALTRACER 145
249. AUDIO SIGNAL GENERATOR 146
250. METAL DETECTOR 146