loading
28Instructables902,830Views165Comments
Thank you all for following me.

Achievements

100+ Comments Earned a bronze medal
10K+ Views Earned a bronze medal
Contest Finalist Runner up in the LED Contest with Elemental LED
Contest Finalist Runner up in the Hurricane Lasers Contest
Show 2 More »
  • Milen commented on Milen's instructable AVR ISP programmer5 days ago
    AVR ISP programmer

    Hi,You simply connect it to the serial port of the PC. (IT MUST BE REAL RS232 PORT). It doesn't require any else except the software.It uses Ponyprog : http://www.lancos.com/prog.htmlIn the list of the supported microcontrollers you can find also AT90S1200.

    View Instructable »
  • Milen commented on Milen's instructable LASER diode driver4 weeks ago
    LASER diode driver

    Hi FrancoIn my circuit you could remove R4,D2,C2 and instead them to connect a digital signal which would modulate the laser light. The problem here is that the used parts does not have enough bandwidth to guarantee the high speed modulation. But in all cases the main principle for laser modulators remains similar.Here you can read how the modulation speed is calculated:http://www.loreti.it/Download/PDF/laser/laser_printer.pdfThere are a dedicated high speed chips used for the modulating of the laser light:http://www.ti.com/product/onet4201ldhttp://cds.linear.com/docs/en/datasheet/5100fs.pdfIn the datasheets you can see typical connection circuits of them.One possible technology of the pattering could be the use of DLP.More info: http://www.ti.com/lsds/ti/analog/dlp/overview.pageRegards...see more »Hi FrancoIn my circuit you could remove R4,D2,C2 and instead them to connect a digital signal which would modulate the laser light. The problem here is that the used parts does not have enough bandwidth to guarantee the high speed modulation. But in all cases the main principle for laser modulators remains similar.Here you can read how the modulation speed is calculated:http://www.loreti.it/Download/PDF/laser/laser_printer.pdfThere are a dedicated high speed chips used for the modulating of the laser light:http://www.ti.com/product/onet4201ldhttp://cds.linear.com/docs/en/datasheet/5100fs.pdfIn the datasheets you can see typical connection circuits of them.One possible technology of the pattering could be the use of DLP.More info: http://www.ti.com/lsds/ti/analog/dlp/overview.pageRegardsMilen

    View Instructable »
  • Milen commented on Milen's instructable Digital multimeter shield for Arduino1 month ago
    Digital multimeter shield for Arduino

    Hi CharleneD16 ,You can replace the chip with a pair of PMOS transistprs (like BSS84 :http://www.nxp.com/documents/data_sheet/BSS84.pdf) Exactly this is SND, but you can find similar in through-hole package. There should not be any difference in the performance.The transistors should be connected in the following way:sources - supplygates - first to the input of the inverter, second at the its outputdrains - to the trimmer potentiometersRegardsMilen

    View Instructable »
  • Milen's instructable Party stroboscope done by recycled parts's weekly stats: 1 month ago
    • Party stroboscope done by recycled parts
      1,459 views
      38 favorites
      0 comments
  • Milen commented on Milen's instructable Digital multimeter shield for Arduino5 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

    View Instructable »
  • Milen commented on Milen's instructable Headphone amplifier5 months ago
  • Milen commented on Milen's instructable Headphone amplifier5 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

    View Instructable »
  • Milen commented on Milen's instructable Headphone amplifier5 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).

    View Instructable »
  • Milen commented on Milen's instructable Digital multimeter shield for Arduino5 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.

    View Instructable »
  • Milen commented on Milen's instructable AVR ISP programmer5 months ago
    AVR ISP programmer

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

    View Instructable »
  • Milen commented on Milen's instructable Arduino controlled power supply source5 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.

    View Instructable »
  • Milen commented on Milen's instructable Audio mixer5 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

    View Instructable »