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  1. S

    Sound recorder with DSP, how to restore erased data

    I have an old sound recorder that includes DSP IC, and I accidentally erased some important audio material. How can I restore this material? The sound recorder has no USB connection. and unfortunately I know nothing about DSP IC programming. This is the image of the sound recorder. **broken...
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    How to know the physical connection of the transformer?

    Primary and secondary windings are chosen by you for what you need to use your transformer (increase or decrease voltage). You have to test it; put a certain voltage on one end and record the voltages on the other ends. Then calculate the increase/decrease ratio.
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    Datasheet needed! (AUREL TX-SAW BOOST AM 434MHz)

    tx-saw-boost I need the datasheet of this AUREL RF Module : Aurel TX-SAW BOOST AM 433.92/434MHz 600 mW(or maybe 400mW) The module number is (650200427) I checked Aurel website (www.aurelwireless.com) and I can't find it. It seems that they discontinued manufacturing this item, but it is still...
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    78L05 regulator output = 8V ?!

    7805 78l05 Thanx for your help .. rfmw , that works . I had connected it reversed , even though I checked the 78L05 datasheet twice :) . I am feeling myself clumsy . Thank you for your help .
  5. S

    78L05 regulator output = 8V ?!

    78l05 à 8v I switched from using the regular 7805 regulator to the small one 78L05 The problem is that the output of 78L05 Vout = Vin - 1V ; when the input is 9V battery the output is 8V approx. I tried more than 20 pieces of 78L05 and all are giving the same output . I experiment them...
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    PIC flashes the LED on power up without a reason!

    PIC power on problem I am sorry to say that neither solution has worked , though the occurance of the problem reduced . I put 100uF b/w Vdd and Vss , enabled the MCLR with pin4 connected to Vdd through resistor , defined all pins as digital I/O , the brown-out is disabled already , and the...
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    PIC flashes the LED on power up without a reason!

    PIC power on problem thanks for your response The watchdog timer is disabled . The MCLR is disabled The brown-out is disabled The PWRTE is enabled and Iam using the internal 4MHz oscillator The problem occurs just at power on , not while executing the program .
  8. S

    PIC flashes the LED on power up without a reason!

    PIC power on problem The circuit diagram is very simple . Just a 6V battery and an LED + resistor connected to pin 5 to ground . The program is working well. Just when I connect the battery , the IC flashes the LED (not always) . the code quoted above is the whole code w/o the delay...
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    PIC flashes the LED on power up without a reason!

    PIC power on problem I am using PIC 12F675 . My project is a simple count down that flashes an LED after several minutes . I got a problem that the IC , sometimes, flashes the LED on power up before executing the program . The LED is supposed not to flash until the "DELAY" subroutine is...
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    DTMF decoder using microcontrollers?!

    mt8880 application thx artem, that helped me much.. by the way, you see iam new here, how can i tell that you helped me?
  11. S

    sending digital over FM transmitter

    thx a lot guys Added after 45 seconds: can anyone offer more help
  12. S

    DTMF decoder using microcontrollers?!

    dtmf decoder +op amp does anybody have an idea how to make a microcontroller (pic, atmel..) decode DTMF signals without the use of an external decoding chip? can u help?
  13. S

    sending digital over FM transmitter

    how to send digital information using fm i have an FM handheld... how can i send digital information of rate about (4.25KHz) over it... my receiver is another identical FM handheld.. i tried by connecting my digital source directly to the mic input but didn't succeed.. can anyone offer help?

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