Search results

Search Forums New Posts
  1. bertus

    7805 regulator capacitors

    Hello, Aluminium capacitors will dry out over time. Tantalum capacitors are solid capacitors and will likely be more stable. On the following pages you can read more about them: http://www.iequalscdvdt.com/Aluminum.html http://www.iequalscdvdt.com/Aluminum_construction.html...
  2. bertus

    7805 regulator capacitors

    Hello, If you do not want to wast to much power, you could have a look at the RECOM R78 series: https://www.digikey.com/en/product-highlight/r/recom-power/r78-series#VTabs3 Bertus
  3. bertus

    Assistance in decoding a circuit diagram

    Hello, The following page will tell you more about capacitors: https://binaryupdates.com/types-of-capacitor/ The foil trimmer capacitor is about 3/4 of the page down. Bertus
  4. bertus

    Seeking IC chip ID

    Hello, It can well be that the parts are propriarity parts.( inhouse codes ). They are likely specialy made for one project. You will not find the datasheet for them. Bertus
  5. bertus

    Link sites with a lot of usefull links for electronics.

    Hello, Here are two link sites with a heap of information on electronics: http://www.101science.com/eleclinks.htm http://educypedia.karadimov.info/electronics/electronicaopening.htm Enjoy your strawl on the sites. Bertus
  6. bertus

    RF basics

    Hello, Here are a couple of books on Microwave and RF design as open source at the internet archive: =mediatype%3A%22texts%22'] https://archive.org/search.php?query=electronics%20opensource%20microwave&and[]=mediatype%3A%22texts%22 Bertus
  7. bertus

    New boy on the forum...

    Hello, Welcome. I am Bertus from the netherlands. Are you a HAM? if so, what is your callsign? Mine is PE1BLY. Bertus
  8. bertus

    LED Circuit Question

    Hello, The led resistor can be calculated: Rled = ( Vsupply - Vfled ) / Ifled The Vfled will be different for each color. The attached PDF will show you rough figures for the colors. Bertus
  9. bertus

    Improvised Alternatives to a High Voltage Probe for Oscilloscope

    Hello, If you are looking for high voltage resistors, have a look here: http://www.high-voltage-resistors.com/ Bertus
  10. bertus

    ID 8-pin DIP

    Hello, When the chip is an OB2263, it is a PWM switching regulator. See the datasheet in the link. https://pdf1.alldatasheet.com/datasheet-pdf/view/1141908/ETC2/OB2263.html https://pdf1.alldatasheet.com/datasheet-pdf/view/1141910/ETC2/OB2263AP.html Bertus
  11. bertus

    Early 1970's Fairchild Transistor Question

    Hello, Here are the short data for the transistors. I found them in my old "Transistor-Taschen-Tabelle": Bertus
  12. bertus

    Using Hameg 208 Service Manual for Philips PM3302?

    Hello, The PM3305 manual can be downloaded from BAMA for free: http://bama.edebris.com/manuals/philips/pm3305/ Bertus
  13. bertus

    7805 regulator capacitors

    Hello, The 78M05 is capable of 500 mA, so that can be used for the mentioned 300 mA. Bertus
  14. bertus

    Light sensing with BPW34, TL074, and Arduino

    Hello, Do you get enough sensitivity? The feedback resistor you use is rather small. Normaly you would see values from 100K and above. I have attached a PDF with more info. Bertus
  15. bertus

    RF basics

    Hello, This is a copy of a post I made at AllAboutCircuits. The US Navy Electricity and Electronics Training series. https://the-eye.eu/public/murdercube.com/Electronics/Electronics/US_Navy_Electricity_and_Electronics_Training/ There is also the US Navy Electronics Technician series...
  16. bertus

    Book Reviews

    Hello, The US navy has three series of books. The US Navy Electricity and Electronics Training series: https://the-eye.eu/public/murdercube.com/Electronics/Electronics/US_Navy_Electricity_and_Electronics_Training/ There is also the US Navy Electronics Technician series...
  17. bertus

    RF related links

    Hello, This is a post I created at the AAC forum some time ago. As a starter I have some interesting RF related links: Linksites: http://www.dmoz-odp.org/Recreation/Radio/Amateur/ http://www.dxzone.com/ http://www.dxing.com/ http://www.kub.it/dir/236/ http://www.qcwa.org/ham-radio-links.htm...
View older results
Top