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  • Milen's instructable Party stroboscope done by recycled parts's weekly stats: 5 days ago
    • Party stroboscope done by recycled parts
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  • Milen commented on Milen's instructable Digital multimeter shield for Arduino3 months ago
    Digital multimeter shield for Arduino

    Hi .Please write the type of both sensors. For the temperature sensor I suppose you have to serch the proper arduino library. The voltage sensor seems to me to have an analog output (check if true). In this case you have simply to use AnalogRead(A0). Check what should be the output voltage if you supply the sensor with 9V battery (as on the picture). If it is higher than 5V - an error will occur - you have to insert proper resistor voltage divider at the output of the voltage sensor and the analog arduino pin.

    Hi,Check the connections of the voltage sensor - seems that the sig and supply pins are swapped. Is it not possible to supply this sensor with 5V arduino supply?Do not forget pull-up resistors needed for the I2C communication. I suppose that also the rx TTL pin shall be connected - some return data is send also during the communication.regardsMilen

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  • Milen commented on Milen's instructable Headphone amplifier3 months ago
  • Milen commented on Milen's instructable Headphone amplifier3 months ago
    Headphone amplifier

    Hi,The feedback resistors should be these placed between pins 1 - 2 and 6-7.May be they are SMD devices. Try to unsolder them and to measure their value with a ohmmeter. After that you could put new ones with higher value - but not more than 1.5-2 times.The maximum supply allowed is 5.5V. 6 V is the absolute maximum rating - applying this voltage for a long time could damage the amp and it is not guaranteed that it can have the full functionality when supplied with 6V.May be better solution could be 3 batteries 1.5V, or as in my case to add a voltage regulator from the type 7805. Then you could apply voltage till 30V.RegardsMilen

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  • Milen commented on Milen's instructable Headphone amplifier3 months ago
    Headphone amplifier

    You could try to boost the gain of the op-amp changing the feedback resistors if possible.

    I am glad that I could attract another guy in the world of the electronics.You can identify the amplifier chip and find it datasheet. Some of the used chips are simply internally defined as buffers (no gain - only source-load resistance matching) - in this case nothing can be done. But is a standard power operational amplifier is used as amplifier stage, normally its gain is fixed by the feedback resistors. (these which connect the output of the amplifier with the corresponding input). If you increase their value - you also increase the gain. You should not increase them a lot because the amplifier can saturate (clip at the supply rails) or the gain increase can cause stability problems (the amplifier can start to oscillate).

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  • Milen commented on Milen's instructable Digital multimeter shield for Arduino3 months ago
    Digital multimeter shield for Arduino

    Thanks,I think - you have to decide which type of communication you want to use : SPI or I2C and depending on this to define the used pins and libraries. From the code you can remove then the LCD and serial monitor part.

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  • Milen commented on Milen's instructable AVR ISP programmer3 months ago
    AVR ISP programmer

    Hi,I did not try, but I think that should be possible

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  • Milen commented on Milen's instructable Arduino controlled power supply source3 months ago
    Arduino controlled power supply source

    Hi, the schematic can be found on step 7. If you do not want to use the kit linked here, the schematic with the LM317 regulator can be seen at step 1. All other connections are described in the text. Some of them depend on which regulator shall be used or which digital potentiometer. The design is done in the way that it allows a big flexibility and the schematics can be different in each particular realization.

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  • Milen commented on Milen's instructable Audio mixer4 months ago
    Audio mixer

    Hi JXplicits,RC4558 could be used, but it requires min. 10V supply. The LM4880 will not work at 10V. You could use additional regulators, but this will make the design more complicated. If you want to use the PCB without changing it, you have to keep also the package type of the active mixer op-amp. One possible solution could be the OPA2316 in MSOP package. I hope you can find it.RegardsMilen

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