Use The CDROM Drive As A Audio CD Player Without The Computer 5 Band Graphic Equalizer Using A Single IC/chip 555 Logic Probe Diode LED Tester 555 Tester Zener Test Transistor Test Transistor Test IR Remote Control Tester Frequency Meter Digital Voltmeter Fm Transmitter 5Volt From RS232 Control Electrical Appliances Using PC 15W Tube Amplifier