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  1. bertus

    Amplitude Modulation Using Op Amp Inputs

    Hello, A transistor or zener will be a better source for noise: https://kb8ojh.net/projects/noisegen/ Bertus
  2. bertus

    ic 4027 wave form

    Hello, As shown it is a divide by 4 circuit. The divide by 2 will be on the pins 1 and 2: Bertus
  3. bertus

    Clarifications on the PWM signal

    Hello, The following page will tell you more about the duty cycle: https://www.quora.com/How-do-we-calculate-the-PWM-time-period Bertus
  4. bertus

    Clarifications on the PWM signal

    Hello, Perhaps a simple circuit may show you how you can make a simple PWM circuit: This circuit was designed by SgtWookie of the AAC. The mosfet will switch the load on and off very fast. Bertus
  5. bertus

    Clarifications on the PWM signal

    Hello, Did you read the wiki page? In there you will find this picture: As it says, there is a percentage of the voltage given to the load. Bertus
  6. bertus

    Far-field antenna polarization...

    Hello, With circular polarization there ts also a difference between left and right turning polarization. It is for instance used with satelite communication. The difference in signal strentgh will be about 30 dB when you use the wrong polarization. Bertus
  7. bertus

    12 VDC fairly high current quick disconnect recommendations?

    Hello, As @Martaine2005 , the Anderson Powerpole are robust and can be made in any configuration. https://en.wikipedia.org/wiki/Anderson_Powerpole https://www.andersonpower.com/shop/wire-to-wire/powerpole.html?cat=17 You can even use the smallest version, wich is capable of 15 A. Bertus
  8. bertus

    Clarifications on the PWM signal

    Hello, Have a look at the wiki: https://en.wikipedia.org/wiki/Pulse-width_modulation Bertus
  9. bertus

    Comedy Thread

    Again some fails from electroboom:
  10. bertus

    Higher than rating capacitance

    Hello, Read this : Electrolytic capacitor properties Aluminium electrolytic capacitors provide a much higher level of capacitance for a given volume than most ceramic capacitors. This means that high value electrolytic capacitors can be relatively small. This is a significant advantage in...
  11. bertus

    12v 5a PWM, how to test

    Hello, When the motor runs at the 12 V 5 A powersupply, then it should also be able to run with the controller. It can be there is a PWM position that there is to less power for the motor to run and the motor will stall. Bertus
  12. bertus

    12v 5a PWM, how to test

    Hello, The potentiometer can be adjusted using a small screwdriver. It will adjust the overcurrent level. Bertus
  13. bertus

    12v 5a PWM, how to test

    Hello, Do you see the blue potentiometer? It says overcurrent next to it. Try to adjust it and see what happens. I will change the title for you. Bertus
  14. bertus

    Hi guys, can anyone help me find this chip I'm located in Canada, thanks

    Hello, It seems to be a controller chip for led backlights in monitor / tv. https://pdf1.alldatasheet.com/datasheet-pdf/view/1132058/ETC1/OZ9998H.html Look at page 20. Bertus
  15. bertus

    Hi guys, can anyone help me find this chip I'm located in Canada, thanks

    Hello, I downloaded resized and cropped the picture: The numbers don't look familiar to me. Bertus
  16. bertus

    Need help to find output of board

    Hello, @ratstar , the backwards diode is there to prevent the back EMF when an inductive load , like a relays or motor , is connected. Bertus
  17. bertus

    Need help to find output of board

    Hello, So the board circuits must be different, as a PNP has other control as the NPN transistors. Bertus
  18. bertus

    Need help to find output of board

    Hello, In your openings post you stated the transistors are BD140. Now you say they are BD139. Wich is correct? Bertus
  19. bertus

    ad623 netlist download to ltspice

    Hello, The AD623 is in the extra library from Bordodynov: LTspiceXVII_2019Jan29.zip (file size : 53,967,027 Kb) More info on: http://bordodynov.ltwiki.org/ At AAC there is this thread: https://forum.allaboutcircuits.com/...nents-models-of-ltspice-free-download.133690/ Bertus
  20. bertus

    Paperwork for AVO two piece valve tester.

    Hello, Of course you can see when a tube has leakage. The getter deposit will turn white in stead of the normal silver color: https://en.wikipedia.org/wiki/Getter Bertus
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