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  1. bertus

    voltage divider with load question and guess

    Hello, An other form of oscillators is the avalanche oscillator. It uses the reverse breakdown voltage of a transistor. http://www.kerrywong.com/2014/03/19/bjt-in-reverse-avalanche-mode/ As you see , you will need an active element to make an oscillator. Bertus
  2. bertus

    voltage divider with load question and guess

    Hello, No, it will not work with leds. The circuit with a neon bulb depends on the breakdown in the bulb. Bertus
  3. bertus

    voltage divider with load question and guess

    Hello, An other way of making a relaxation oscillator is with a neon bulb: http://www.bristolwatch.com/ele/neon.htm There are some more neon circuit here: http://www.vk6fh.com/vk6fh/neonovelties.htm Bertus
  4. bertus

    Bridge circuit impedance

    Hello, Is it possible to zip the file? What would be the size when zipped? Are the notes from this collection: https://archive.org/details/WestonEngineeringNotes/Weston Engineering Notes - Index to Vol1 & 2 The bridge is mentioned in 2.5. Bertus
  5. bertus

    voltage divider with load question and guess

    Hello, When do you learn to draw decent schematics? Here I redrawn your sketch: I used the symbols from this sheet to create the drawing: Bertus
  6. bertus

    can I have some help with measuring hz of an osc with a multimeter

    Hello, Do you mean something like a relaxation oscillator? You could have a look at this one with an UJT: https://www.electronics-tutorials.ws/power/unijunction-transistor.html Bertus
  7. bertus

    Comedy Thread

    Do you have some time left for 5 hours of looney tunes?
  8. bertus

    ic 4027 wave form

    Hello, One of the problems that I see is that the outputs of the 4049 can not go higher than the base/emittor voltage of the output transsitors. I also wonder if the 4049 can pull down against the 270 Ohms. It is also not clear what the transformer voltage is. Also there is no data for the...
  9. bertus

    Using a digital potentiometer

    Hello, With the H connected to the + and L to the ground, you should be able to read a voltage from 0 to 5 Volts on the W. Did you see this thread on the AAC forum: digital potentiometer Bertus
  10. bertus

    Using a digital potentiometer

    Hello, This is given in the datasheet: H - High-Terminal Potentiometer. This is the high terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the L-terminal. Voltage applied to the H-terminal cannot exceed the power-supply voltage, VCC...
  11. bertus

    Using a digital potentiometer

    Hello, What did you do with the pins 3 and 6? Those are the ends of the potmeter: Bertus
  12. bertus

    Battery contact description

    Hello, Those contacts look quite corroded. I would also check the continuety of the contact to the PCB track. It can well be that the corrosion attacked the tracks. Bertus
  13. bertus

    Analog frequency meter

    Hello, When you resize the pictures to have a size of about 300 kB, you will be fine. You can add the pictures to a post using the "Upload a File" button. Bertus
  14. bertus

    ic 4027 wave form

    Hello, Could you scan or make a photo of the page and post it here? Then we can have a look at the circuit. Bertus
  15. bertus

    ECG amplifier stage running rail voltage

    Hello, Can you post a schematic of the current situation? Bertus
  16. bertus

    What music do you like?

    The king singers:
  17. bertus

    ic 4027 wave form

    Hello, What is the supply voltage of the 555? Is that also connected to the 9 Volts? How do you check the output voltage? If you look at the output with a scope, post a picture. If not, can you make a drawing of the output voltage you see? Bertus
  18. bertus

    Power Electronics for Beginners

    Hello, Here is an overview of DC DC converter topologies. Bertus
  19. bertus

    RF related links

    Hello, Here I have a collection of RF and HAM 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 http://www.qsl.net/k4usc/ham-links-3.html...
  20. bertus

    RF related links

    bertus submitted a new resource: RF related links - RF related links Read more about this resource...
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