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  1. ramussons

    Read out button presses of digital phone

    Read about Push Button Matrix decoder.
  2. ramussons

    Generac Niagara 400 (watt) standby generator

    Could you please explain that procedure? If the residual magnetism is reversed, it can lead to the problem.
  3. ramussons

    ITA25N50R equivalent

    Here's the Data Sheet. https://datasheetspdf.com/pdf-file/1309077/IPS/ITA25N50R/1 Google for a N channel mosfet mentioning Vdss = 500 and Id = 25. It gives a list.
  4. ramussons

    Audio spontaneously develops volume flutter at about 10 Hz

    Radio wave reflections can cause motorboating. If indoors and not using an external antenna, a ceiling fan can cause this havoc. I have noticed this in portable FM receivers. An external antenna pickup can also be interfered with by moving bulk of metal - trains, ships, aeroplanes ( :eek:), ...
  5. ramussons

    Marantz 2230B with Weak FM

    Stereo will not work below a threshold signal strength. So weak signal, no stereo.
  6. ramussons

    High power, low capacity UPS circuit

    Make an Online UPs. Unreliable AC ----> Battery Charger -----> Battery --------> Invertor (1 KVA) -----> Load 1 KVA invertors are commercially available. Google Solar off grid 48 volt to 110 volts 1KVA Invertor Batteries - 4 x 12 Volts = 48 volts Charger 48 volts / 30 A
  7. ramussons

    Marantz 2230B with Weak FM

    You have a 19 KHz signal detector after the main demodulation. If that is not properly tuned, it will not detect the 19 KHz pilot and you will not get the "stereo" working, whatever be the local radio receive strength. Tune to a good stereo station and trim that detector tank till the stereo...
  8. ramussons

    Buck Converter Clarification

    The duty cycle is calculated not by the voltages alone, but by Power IN to Power OUT. That means an infinite set of values for various Input Voltage vs Output Power. That is why you have a Feedback system for Pulse Width.
  9. ramussons

    Germanium power transistors

    Just remember that Germanium Power Transistors are quite finicky about temperatures. Try to ascertain why they failed in the first place.
  10. ramussons

    Ampere/voltagemeter

    Such type of meters do not have the capability to sense both +ve and -ve voltages on its voltage sense input. You will have to cross connect the inputs on polarity reversal.
  11. ramussons

    synchronization

    Synchronisation simply means that all processes / operations refer to the same Time Base or Clock. This is done so that the sequence of processes do not Break or Overlap. Generally, you may have multiple sequential processes, called threads, going on at the same time. They may interact in...
  12. ramussons

    Why does zener voltage decrease as series resistor increases?

    Look at it this way. Your setup behaves like a voltage divider made of Rz and 820 Ohms resistors. The output voltage gets clamped to 5.1 volts due to the zener.
  13. ramussons

    PS900 Oscilloscope Sweep Function Not Working

    It is a dual channels oscilloscope and you should get 2 spots. Give an input to both channels and see what happens. And a photo of the oscilloscope front will help us a lot more.
  14. ramussons

    How change the Frequency of a 555 timer with another circuit ?

    You can change the frequency of a 555 by changing the voltage on pin 5.
  15. ramussons

    i have problem in my electric pressure cooker it just trip whin make on

    What is the power rating of the cooker? And the permitted power in your room?
  16. ramussons

    How difficult to have a microphone made

    Maybe this? https://www.amazon.com/Wireless-Microphone-Recording-Auto-Sync-Bluetooth/dp/B09GXJWV64/ref=sr_1_7?keywords=wireless+microphones+for+phones&qid=1644675533&sr=8-7
  17. ramussons

    PS900 Oscilloscope Sweep Function Not Working

    Do you get a spot on the screen? Is the vertical sweep active? Make sure that you are not in the XY mode by mistake.
  18. ramussons

    manual and automatic dimming of leds

    The LDR in the discharge path of the timing capacitor will mean that Darker the environment, Dimmer the LED. You will have to move the LDR to the Charging path of the timing capacitor.
  19. ramussons

    manual and automatic dimming of leds

    You are planning to use PWM for LED intensity control. There are 2 ways PWM is done. In your setup shown above, you are varying the ON/OFF period of the 555 maintaining the clock period the same. That is, Ton + Toff = constant. If we plan to keep the Ton the same, and shorten or extend Toff ...
  20. ramussons

    China transformer ups not on

    UPS turned ON?
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