VARIETY STUFF

1.USE PC AS CRO

2.RAIN SOUND EFFECT GENERATOR

3.12 VOLTS INVERTER FOR SOLDERING IRON

4.SALT TASTER CIRCUIT

5.SLEEP AID CIRCUIT

6.ELECTRONIC GATE KEEPER

7.WALKING DISTANCE MEASURER

8.BATTERY STATUS INDICATOR

9.FULL DUPLEX VOICE INTERCOM

10.TELEPHONE CALL VOICE CHANGER

11.BEST RECTIFICATION CIRCUIT

12.BASIC UPS

13.VARIABLE POWER SUPPLY

14.SCHMITT TRIGGER

15.DOOR BELL WITH VISITOR COUNTER

16.TRANSFORMERLES POWER SUPPLY

17.METAL DETECTOR

18.AUTOMATIC GATE LAMP

19.SMART SMOKE SENSOR

20.FRIDGE DOOR ALARM

21.PRECISE FM TUNING INDICATOR