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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by zahwi

  1. Z

    OLED Oscilloscope ATtiny85 2025-01-29

    Bandwidth is DC to 5KHz. Max sampling rate is 50,000 samples per second. An oscilloscope with these specifications has limited use, but it is a good exercise in using OLED display. Software trigger starts the sampling when the input signal crosses zero. Input tolerates 5V max. ATtiny85 or...
  2. Z

    FREQUENCY COUNTER 16MHz PIC12F1822 2025-01-23

    The PIC12F1822 microcontroller is programmed to count the input frequency during accurate 1 second by dividing the 8 MHz crystal. The CPU runs at 32MHz from a PLL. The counter measures the frequency for 0.1sec first, if the frequency is greater than 2MHz TMR0 pre-scaler divides by 4 to increase...
  3. Z

    SD Card Player ATtiny85 2025-01-14

    The firmware works for SD or SDHC cards only, 1-32 GB. ATtiny85 or ATtiny45 can be used. The FAT32 code is minimal, it only fined the files location and repeats playing all the songs in the order they are in the file allocation table. File names have to be short, 5 characters max, and located...
  4. Z

    Why do 120 vac home LED light bulbs flicker?

    That is right, all LED lights designed to work on 100-240V and the designers cut corners. If you increase the voltage to 200V the flicker will stop.
  5. Z

    Waveform Generator 2025-01-11

    AD9833 module is a 0-10Mhz waveform generator with integral 25MHz crystal oscillator, the output frequency is set by the SPI controlled divider of the AD9833. A DAC shapes the sine and triangle waveforms, amplitude is 600mV. Squarewave amplitude is 5V. The PIC drives the AD9833 using SPI. The...
  6. Z

    SD Card Data Logger PIC16F1827 2025-01-09

    Logging temperature from sensor DS18B20 -55 to 125 deg C. Logs up to 65,000 readings to a TXT file on a SD Card formatted FAT32, SDHC (up to 32GB). This PIC16 is short on RAM to write 512 bytes (full sector) to the card, so it cannot create a file, instead it modifies a file on the disk. The...
  7. Z

    Misbehaving key!

    In Settings add another language, English(US) or English(UK), you may find that the keys are ok in one of the languages.
  8. Z

    PIC12F1822 FAT32 SD wave Player 2025-01-07

    The firmware works for SDHC cards only. Code C for MPLABX with XC8. HEX files included. The FAT32 code is minimal, it only finds the files location and repeats playing them. File names have to be short and located in the root folder. The PIC's CCP is used as a DAC to convert the digital data...
  9. Z

    Tiny display needed

    You can use LED bar graph driven by LM3915 and digital pot IC like X9C104 that adjusting pot by up/down buttons. You need some electronic knowledge to connect the ICs.
  10. Z

    Bjt Help

    Input resistance is (β+1)(re+Re). The current through Re is the same as the current through re, and the emitter current is (β+1) which is the collector + base current .
  11. Z

    H Bridge for switching the polarity of a DC motor

    This circuit will never work because all the power transistors are always on shorting the supply. Put the NPN transistors on top and the PNP at the bottom with the emitters of each pair linked, the bases of each pair are linked too. This way it is complimentary emitter follower and there is...
  12. Z

    which microcontroller

    "Sorry, utter rubbish". Is this polite enough?! You the Mods have plenty of respect for your own selves, you don't need my respect and I don't respect you anyway. If you can't take or understand a simple joke like the one about NASA and the relays then I'm with the wrong company. Goodbye ETO.
  13. Z

    which microcontroller

    Nigel Good of you to reassure the OP that if he is making his product for NASA then ETO is the right place for him to get advice. I guess the name was changed to 'sold state relays' because they are always sold out. :-)
  14. Z

    which microcontroller

    If you are making it for NASA then relays are more reliable than PIC.
  15. Z

    I don't have a Soldering iron?

    You can use a copper wire of 2 to 4 mm diameter and heat it on a flame until it melts the solder then apply it to the the broken joint. You may have to repeat it several times. This is how they used to solder in the old days.
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