Search results

Search Forums New Posts
  1. bertus

    signal modulation

    Hello, What is given in the lessons? Have a look at the links of the following page for some modulation techniques: http://educypedia.karadimov.info/electronics/modulation.htm Bertus
  2. bertus

    Timer 555 voltage

    Hello, Can you post a schematic of your project? That way we can see if we can make improvements on it. Bertus
  3. bertus

    Transistors

    Hello, Just download a transistor databook and compare them. Here are some examples of such a databooks: https://archive.org/details/TransistorAndDiodeDatabook1stEd1973/mode/2up https://archive.org/details/MotorolaSmallSignalTransistorDataBook1984/mode/2up You might also want to have a look at...
  4. bertus

    Timer 555 voltage

    Hello, What do you have in mind? Why do you need 18 Volts? The NE555 will also work on 9 Volts. When you want to reduce the voltage from 18 Volts to 15 Volts , you could use a LM7815. Bertus
  5. bertus

    Gel disinfectant distributor circuit

    Hello, The values I have posted are for the IR diode (you posted) and photo transistor (I posted) on 12 Volts. Bertus
  6. bertus

    Gel disinfectant distributor circuit

    Hello, For 12 Volts I would make the following changes: R1 390 Ohms, to obtain a led current of about 30 mA R9 1k, to obtain a led current of about 10 mA R7 22k, to obtain a comparator current of about 5 mA V1 15k, to have a greater adjustment range No other changes will be needed. Bertus
  7. bertus

    Gel disinfectant distributor circuit

    Hello, Better use this instead of the photo diode: https://win.adrirobot.it/datasheet/optoelettronica/pdf/YG1006_Phototransistor.pdf Then there will be no other changes needed. Bertus
  8. bertus

    1-bit magnitude comparator.

    Hello, Here is the question in full: In the case A=B , both are either 0 or 1. Bertus
  9. bertus

    Comedy Thread

  10. bertus

    60 GHz rf meters

    Hello, It won't be cheap: https://www.theemcshop.com/rf-field-strength-probes-meters/1051-narda-nbm-520-broadband-field-meter-100-khz-60-ghz.html About the frequencies for 5G NR, here a piece of the wiki: Frequency bands for 5G NR are being separated into two different frequency ranges...
  11. bertus

    willem programmer pcb repair

    Hello, The PCB seems to be a design of Peter Vis: https://www.petervis.com/Electronics_Tools/Willem_Eprom_Programmer/Willem_Eprom_Programmer.html He does not show the schematic. I found a schematic of the 4.5 version: http://www.py2bbs.qsl.br/willem_pcb45en.php It looks like there is a...
  12. bertus

    Electronics Moron Needs Help

    Hello, Looking at the manual, speed 1 is 500 RPM. Bertus
  13. bertus

    Help with mixed signal circuit power supply

    Hello, You could have a look at the LT3265. That chip can mage a positive and negative voltage from a positive voltage. The voltages can be adjusted by a couple of resistors. Bertus
  14. bertus

    willem programmer pcb repair

    Hello, Perhaps this old thread on the AAC might have some info for you: https://forum.allaboutcircuits.com/threads/need-help-with-willem-eprom-pcb-5-0e.81003/ Bertus
  15. bertus

    COVID-19

    Hello, The wiki has now also several coronavirus pages. World : https://en.wikipedia.org/wiki/2019–20_coronavirus_pandemic USA : https://en.wikipedia.org/wiki/2020_coronavirus_pandemic_in_the_United_States Europe : https://en.wikipedia.org/wiki/2020_coronavirus_pandemic_in_Europe Australia ...
  16. bertus

    Need datasheet for what appears to be an oscillator...

    Hello, That picture is useless. There is nothing to see on the part. Can you use the macro or zoom fuction of the camera? My phone has a zoom function that works quite well. Bertus
  17. bertus

    Need datasheet for what appears to be an oscillator...

    Hello, Do you have a picture of top of the part you removed? Bertus
  18. bertus

    Searching for a 30A 36-42V DC (Emergency) switch.

    Hello, The switches I have seen won't go higher as 20 A. When you want to switch higher currents, use a smaller switch with a power contactor (relay). Bertus
  19. bertus

    RS422/485 and ground wire.

    Hello, Did you see this in the given document? Bertus
  20. bertus

    RS422/485 and ground wire.

    Hello, Have a look at page 20 (page 23 of the PDF) for choosing the cable for RS422/RS485. Bertus
Top