Showing posts with label Digital. Show all posts
Showing posts with label Digital. Show all posts

Wednesday, March 27, 2013

CD ROM Drive as Digital audio CD Player

A CD-ROM drive can be used as a stand-alone unit for playing digital audio CDs without interfacing with a computer. The stereo output of CD player available at the audio jack can be amplified using audio input facility which is normally available on a tape-deck/tape-recorder or a stereo amplifier. Audio socket on front/rear of the CD-ROM drive is capable of driving headphones or speakers of less than 500mW. Proper stereo jacks for interconnection between CD-ROM drive and tape deck are available from computer/tape recorder spares vendors. The principle of operation is illustrated here with the help of block diagram.

CD-Rom Drive as Digital-Audio CD Player

The 4-pin power supply socket available at the rear of a CD-ROM player is meant for +5V, ground (two middle pins) and +12V inputs. The power supply can be easily derived using a conventional power supply circuit as shown in the figure. If you have an external CD-ROM drive, it can be simply plugged into the mains since it has self-contained power supply circuit inside.

OM Drive as Digital

While there may be minor differences amongst the available CD-ROM drives’ external controls, a typical drive’s controls are shown in the figure here. Please ensure that a proper power supply connector available from computer spare parts vendor is used for connection to CD-ROM drive. To identify +5V and +12V pins on the drive connector, please note that in the computer +12V is routed using a yellow wire and for +5V a red wire is used, while for ground black wires are used with the supply connector. Once the power supply has been connected correctly, you will notice that LED indicator on the drive starts flashing. Now the digital audio CD can be loaded after pushing the eject button. A second push of the same button causes retraction of CD carriage into the drive. One can change the track (song) on the CD using play switch on the CD-ROM drive.

Source :ELECTRONICS PROJECTS Vol. 20

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Thursday, March 17, 2011

NAND Gate Pulse Generator Circuit

The Following diagram is the Pulse (Clock) Generator circuit diagram of the which the build based on NAND Gate Logic IC. You May use IC 7400 or 4011 for this circuit. This circuit is very useful while checking / operating counters, stepping relays and other digital circuits. It avoids the procedure of setting a switch for the required number of pulses.


NAND Gate Pulse Generator CircuitNAND Gate Pulse Generator Circuit

7400 NAND Gate Pinout

For a range of Pulse speeds determined by a large capacitor (4.7 μF) and a logarithmicpotentiometer (1 MΩ), but feel free to play around and find Some better combinations for yourself. A single clock cans Also be Used to drive installments sequencers, so u cans have all the instruments to play together.
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Saturday, March 12, 2011

Simple Pulse Generator Circuit by CD4049 Cmos Inverting IC

Here is Simple Pulse Generator circuit Based IC invertig CD4049. This circuit use only 1 active component and very..very few passives components around. It use digital cmos CD4049 Hex Inverting Buffer IC. The pulse generators can also produce a 50% duty cycle square wave. It may use digital techniques

Pulse Generator circuit by CD4049 Simple Pulse Generator circuit

CD4049 Pinout

Note:
  • The Pulse Rate frequency signal (F) = 1 /(1.4RC) .
  • The power supply used DC 5V-12Volt.
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60 Hz Clock Pulse Generator Circuit By MM5369

Here is a 60 Hz clock pulse generator circuit provides a clean, stable square wave and it will operate on anywhere from 6 to 15 volts. The IC and color-burst crystal are the kind used in TV receivers. The 3.58 MHz output makes a handy marker signal for shortwave bands.

60 Hz clock pulse generator circuit60 Hz clock pulse generator circuit By MM5369

Resistor R1 is necessary to bias the inverter for class A amplifier operation. Capacitors C1 and C2 in series provide the parallel load capacitance required for precise tuning of the quartz crystal.

The Tuner Output is a buffered output at the crystal oscillator frequency. This output is provided so that the crystal frequency can be obtained without disturbing the crystal oscillator. The Divide Output is the input frequency divided by the mask programmed number. Both outputs are push-pull outputs
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1Hz Pulse Generator Circuit by IC 555

This is a 1Hz pulse generator circuit using the timer IC 555 which is wired as an Astable Multivibrator. The output pulses can be indicated visually by the LED. An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit. This circuit does not require any external trigger to change the state of the output, hence the name free-running. This circuit can be used in applications that require clock pulses

1Hz Pulse Generator Circuit
1Hz Pulse Generator Circuit by IC 555

We can set the 555 to work at the desired frequency by selecting the right combination of resistances & capacitance.

Frequency = 1.44 / {(R1 + 2R2) * C1}
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