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Recent content by Eva713

  1. E

    Capacitor Testing Problem

    Hello, all I'm testing coupling caps for DC volt leakage. The amp is a '58 Princeton and is powered up with a signal generated, the tone and volume controls are at mid level. All of the filter caps have been replaced with new F&T's and the amp sounds fine but I'm curious if I need to be...
  2. E

    SATA Hard Drive Using Problem

    Hi, folks I propose to install a Samsung F3 1TB sata hard drive in my XP Pro computer. The motherboard is an Asus A7N8X Deluxe with revision 1 sata connectors. Will the Samsung hard drive be compatible with the sata revision 1 connectors on the motherboard? I have heard that I might have to...
  3. E

    NAND Memory Use

    Hello, all I am using the Zynq Ultrascale+ MPSoC on a custom board and have an 8bit NAND Flash memory to boot from. When I try to program the Flash using the Vitis Program Flash Memory tool I am able to measure the CE pin and it does go low and high so I believe the tool is trying to program the...
  4. E

    How to select a proper potentiometer?

    I know any device used to lower the power to the lamp would need sufficiently high enough power rating. Here pot as such generally are rather low, perhaps 1/4w and not suitable. :(
  5. E

    How to select a proper potentiometer?

    Hi, folks I need a recommendation for a potentiometer. I have an old 8mm projector that uses a 8v 50w bulb. The bulb works off a simple on/off switch. I would like to insert a potentiometer inline between the transformer and bulb to vary the intensity of light the bulb generates. Even if I read...
  6. E

    PNP transistor or NPN transistor?

    Thank you all for the replies. Maybe I need to look up the data or measure the transistor for gain. One fact must be recognized that most transistors are made by many different manufacturers, and some transistors of one type have a different connection layout.
  7. E

    PNP transistor or NPN transistor?

    Good day, all I'm kind of a newbie with electronics but I do know some how to differentiate the two. But in this there aren't any of the common markers. If I had to guess it would be NPN from NPN Transistor Arrangement and Symbol Basic but I can't be certain. If someone more experienced could...
  8. E

    Voltage divider circuit to run an LED?

    Thank you for sharing ideas.. If I just use big enough resistors, it'll still work? If I use 10k in resistors, I'll get about 6mA, at 60V would be 360mW across the LED, wouldn't it? Or would it be 360mW split across all the resistors and the LED?
  9. E

    Voltage divider circuit to run an LED?

    Hi, all Recently, I have a system running at 62V max, 54V nominal based on voltage divider formula. I wanted to have a little alert LED, so I was thinking about using 10, 1kohm resistors, and adding the LED bewteen the 9th and 10th (or 1st and 2nd, if it matters), to get at most 6V and just a...
  10. E

    RC Low Pass Filter Problem

    Here the circuit schematic I just realized after looking at my resistor values they aren’t set correctly anymore to pass 60hz so please ignore that.
  11. E

    RC Low Pass Filter Problem

    Good day, all I’ve read this note RC Low-pass Filter Design (Sample) to design a a low pass filter for converting 120 VAC to 0-5V to input as analog into the arduino. Attached is the filter I’ve got on the bread board now and it isn’t working and I can’t come up with where I’ve went wrong. The...
  12. E

    Problem to understand diffusion capacitance in PN junction and forward bias diode resistance

    Thank you for sharing. 😊 I understand the concept for the resistance but I will rephrase my question for the diffusion capacitance. So diffusion capacitance comes into play in the forward bias because of the minority carriers in each of P and N region of the diode. As we change the forward bias...
  13. E

    Problem to understand diffusion capacitance in PN junction and forward bias diode resistance

    Hi, all Recently, I have read some articles about PN junction, one of them (data source: Analysis in PN Junction Diode) impressed me deeply and had such doubts What is the concept behind diffusion capacitance and on resistance of the diode? Can we consider diffusion capacitance as a parallel...
  14. E

    What Analog-to-Digital Converter Do You Use?

    Hey Guys, I'm looking for some advice on a analog to digital converter applications. Recently, I have write an tech note about ADC (What is the Use of Analog to Digital Converter?-If there is any mistake, please leave me a comment, thanks!), and I need some examples of using ADC and the...
  15. E

    Measure the current of a normal 12v dc motor?

    I would like to know if there is a way to measure the current of a normal 12V dc motor. I am using a DRV8838 and an Arduino Nano. I want to use it to stop the motor once a specific current draw or load is reached, if the motor is about to stall. Is there any ideas of it? if possible a simple...