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Description:
In this application, we are building a gaincard like amplifier. This
application type is named gainclone in audio world. To take a satisfactory
audio response, we are adding a Linkwitz equaliser to the feedback line
and adding bass compensation also.
We are using LM3886 which is the revised version of its brother LM3875.Briefly features of LM3886 are.
Maximum Output Power: 68W RMS - 108W Peak
THD: %0.03 at 60W
SNR: 110dB at 60 W - 92.5dB at 1W
PSRR: 120dB
Protection Circuitries: DC/AC Short circuit protection and thermal protection
Output Class: Conjugate AB-A
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Description:
This project is based on ISD2560P IC which allows us to record 60 seconds voice record and playback it with very high quality. As shown in the schematic, we input the voice by using an electret microphone. If a dynamic microphone is used, R2,R3,R4 resistors and C3,C5,C7 capacitors will be omitted and microphone will be connected to 17 and 18 numbered pins directly. Since it has better frequency response, we choose electret microphone in this project.
Controlling the circuit is
very simple. Sw1 switches between record and playback modes. Push
button B1 is used for start and pause functions. B2 stops the process.
To
record voice, first move Sw1 to record position and push B1 once. IC
will start recording and during this process red LED will bright. One
push to B1 pauses and second push continues recording. You can record
60 seconds by this way. To stop recording push B2.
To listen the voice recorded before, move Sw1 to playback position then
push B1. During the playback process red LED will bright again. One
push to B1 pauses and second push continues playing. To stop playback
push B2...
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Description:
As shown in the schematic, temperature sensor of our electronic thermometer is LM35DZ. There are some kinds of LM35 IC, since it is cheap and easy to find we used LM35DZ in our project. It measures from 0°C to 100°C with a very linear output graph. For one degree change, it increases its output 10mV.On the other hand, this circuit measures temperature values only between +10°C and +39°C.
2
numbered (middle) pin of the sensor is connected to the 5 numbered pins
of LM3914 ICs. So every IC determines how many leds of bargraph will
bright due to the analog signal received from the sensor. 2.2 microfarad
tantal capacitors are connected between the 2 and 3 numbered pins of
LM3914. Resistors in the circuit have %1 tolerance values...
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