Showing posts with label make. Show all posts
Showing posts with label make. Show all posts
Saturday, 30 March 2013
Make a Single Chip Programmable Voice Audio Recorder Circuit
The article explains a single chip circuit which can be used for recording short voice clips or any audio clip ranging from 20 to 60 seconds. The incorporated IC APR9600 is a programmable voice recorder chip which facilitates infinite number of recording/erase of audio files in it as per user preference.
The recording or storage of the audio can be done through an integrated electret mic or via any line out or RCA port of an audio reproducing device.
However since the IC is a low bit device does not support Hi-Fi recording rather low quality music.
The sampling rate or the frequency response is limited to just 8 kHz max thats pretty ordinary if we compare it with the specs of modern Hi-Fi equipment.
Nevertheless, the IC is a stand alone device which does not depend on any external circuits, just plug it in, and it starts recording whatever voice data is fed across its input pins. Moreover since the data can be erased and refreshed any number of times, the unit becomes completely programmable and a pretty useful gadget.
Image courtesy: http://www.datasheetcatalog.org/datasheet/aplus/APR9600.pdf
Circuit Description
The proposed circuit of a programmable single chip voice recorder/player utilizes the IC APR9600 as the main processor of the circuit.
Its a 28 pin IC which can be very easily and quickly configured for getting the required results by adding a handful of common passive electronic components.
All the pin outs of the IC are specified by their individual functions, and the components are accordingly attached with the respective pinouts.
For example pin#28 and pin#27 are assigned as the trigger inputs for initiating playback and recording functions.
Sliding the connected switch toward right initiates the playback action while toggling it toward left puts the IC in the recording mode.
The IC also has appropriate visual indication options which provide the user with instant information regarding the position of the circuit.
The LED at pin#8 indicates the end of a playback file session.
The LED at pin#10 stays illuminated for so long the audio is being played, indicating circuit "busy"
The LED at pin#22 indicates through rapid flashes regarding the playback or recording modes of the IC.
The input data is normally picked from the mic which is appropriately connected across the pins 17 and 18 of the IC.
When the slider switch is pushed toward the recording mode, any audio entering the mic gets stored inside the IC until the specified time elapses.
The sampling rate of the IC can be set as per the user preference. Lower sampling rates will provide longer recording/playback periods and vice versa.
Longer periods would also mean lower voice quality while shorter periods of recording spec will produce relatively better sound processing and storing.
The entire circuit operates with a 5 volt supply which can be acquire through a standard 7805 IC after rectification from a standard transformer bridge capacitor network.
The audio output may be derived across pin#14 and ground which must be terminated to an audio amplifier so that the data can be heard with proper volume.
The recording or storage of the audio can be done through an integrated electret mic or via any line out or RCA port of an audio reproducing device.
However since the IC is a low bit device does not support Hi-Fi recording rather low quality music.
The sampling rate or the frequency response is limited to just 8 kHz max thats pretty ordinary if we compare it with the specs of modern Hi-Fi equipment.
Nevertheless, the IC is a stand alone device which does not depend on any external circuits, just plug it in, and it starts recording whatever voice data is fed across its input pins. Moreover since the data can be erased and refreshed any number of times, the unit becomes completely programmable and a pretty useful gadget.
Circuit Description
The proposed circuit of a programmable single chip voice recorder/player utilizes the IC APR9600 as the main processor of the circuit.
Its a 28 pin IC which can be very easily and quickly configured for getting the required results by adding a handful of common passive electronic components.
All the pin outs of the IC are specified by their individual functions, and the components are accordingly attached with the respective pinouts.
For example pin#28 and pin#27 are assigned as the trigger inputs for initiating playback and recording functions.
Sliding the connected switch toward right initiates the playback action while toggling it toward left puts the IC in the recording mode.
The IC also has appropriate visual indication options which provide the user with instant information regarding the position of the circuit.
The LED at pin#8 indicates the end of a playback file session.
The LED at pin#10 stays illuminated for so long the audio is being played, indicating circuit "busy"
The LED at pin#22 indicates through rapid flashes regarding the playback or recording modes of the IC.
The input data is normally picked from the mic which is appropriately connected across the pins 17 and 18 of the IC.
When the slider switch is pushed toward the recording mode, any audio entering the mic gets stored inside the IC until the specified time elapses.
The sampling rate of the IC can be set as per the user preference. Lower sampling rates will provide longer recording/playback periods and vice versa.
Longer periods would also mean lower voice quality while shorter periods of recording spec will produce relatively better sound processing and storing.
The entire circuit operates with a 5 volt supply which can be acquire through a standard 7805 IC after rectification from a standard transformer bridge capacitor network.
The audio output may be derived across pin#14 and ground which must be terminated to an audio amplifier so that the data can be heard with proper volume.
Wednesday, 27 March 2013
How to Make a LED Chaser cum Blinker Circuit Using IC 4017
The presented circuit was requested by Mr.Joe, one of the keen followers of this blog. The circuit initially was intended to be used for generating LED strobe light effects and was asked to be modified such that it could be used as an LED sequencer as well as a blinker. The change over would be implemented via a toggle switch.
The circuit diagram may be understood with the following points:
The IC 4017 is not new to us and we all know how versatile and competent this device is. Basically the IC a Johnson’s decade counter/divide by 10 IC, fundamentally used in applications where sequencing positive output signals are required or desired.
The sequencing or the orderly shifting of the outputs take place in response to a clock pulse that needs to be applied at the clock input pin #14 of the IC.
With every rising positive edge of the clock input, the IC responds and pushes its output’s positive from the existing pin out to the next pin out in the order.
Here a couple of NOT gates are used as a oscillator for providing the above clock pulses to the IC 4017. VR1 may be adjuted for determining or fixing the speed of the sequencing.
The outputs of the IC are connected to an array of LEDs in a specific order which makes the LEDs look like as if they are running or chasing during the operations.
If the circuit would be required only to produce the chasing effect, the diodes would not be required, however as per the present ask the diodes become important and allows the circuit to be used as a blinker also, depending upon the position of the switch S1.
When the switch S1 is positioned at A, the circuit behaves like a light chaser and produces the normal chasing effect over the LEDs which start illuminating in sequence from top to the bottom, repeating the operations as long as the circuit remains powered.
As soon as S1 is flicked toward B, the clock signals from the oscillator are shifted into the input of the transistor T1, which instantly stats to pulsate all the LEDs together in response to the received clocks from N1/N2 configuration.
Thus as per the requirement we have successfully modified an ordinary light chaser circuit with an additional feature through which the circuit now is also able to function as a LED flasher.
Do not forget to connect the inputs of the remaining unused gates from the IC 4049 either to the positive or the negative of the supply. The supply pins of the IC 4049 also need to be connected to the relevant supply rails of the circuit, kindly refer to the datasheet of the IC.
Tf all the ten outputs of the IC 4017 are required to be integrated with LED sequencing, just connect pin #15 of the IC to ground and use the left over outputs of the IC for the required sequencing of the LEDs in the order of: 3,2,4,7,10,1,5,6,9,11
Parts List
The fooliwng parts will be needed for making this LED light chaser cum flaher circuit:
R1, R2, R3 = 1K,
VR1 = 100K linear pot.
All LED resistors are = 470 Ohms,
All diodes are = 1N4148,
All LEDs = RED, 5mm or as per choice,
T1 = 2N2907, or 8550 or 187,
C1 = 10uF/25V
C2 = 0.1uF,
IC1 = 4017,
N1, N2 = IC4049
Subscribe to:
Posts (Atom)
