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  1. 2

    Ramping signals with op amps?

    Hey Steve, I was under the impression that we were able to get this ramping result without adding any other voltage offsets. So I guess we need to add an offset. So I have recreated the circuit and tested it. the circuit works perfectly when the bias offset is at -0.5VDC as opposed to -1 VDC...
  2. 2

    Ramping signals with op amps?

    Hi Steve, I’m trying to review all this op amp stuff.... sorry if I’m slow. What do you mean exactly by 3-(5/ 1.5) And also where do I need to provide a -1/3 volt bias??? At the input (to the right of ra?) Thanks
  3. 2

    Ramping signals with op amps?

    Hello, I have tried all day to make sense of this... calculation after calculation and I really don't get it. I need some clear and concise help !!! :( Please refer to the image attached. I would like to be able to build and calculate (for my personal learning) an op amp that takes a 3 to...
  4. 2

    Ramping voltage to current converter?

    Thanks Bob
  5. 2

    Ramping voltage to current converter?

    Hi Bob, After looking at the LM324 it seems like it’s Single or dual supply.... I could be wrong but it says +/-16VDC Anyways I don’t have the data sheet in front of me but I do remember seeing that it can work As single supply ground to +32VDV Or +16VDC to -16VDC 24v
  6. 2

    Ramping voltage to current converter?

    Ok thank you Bob..... It’s very appreciated! 24V
  7. 2

    Ramping voltage to current converter?

    Hi Bob, A lm324 ... is it a rail to rail op amp? Cause that’s the only one I have currently Thanks
  8. 2

    Ramping voltage to current converter?

    Ok steve thanks for your help... I’ll review some electronics and get back to you. I think today we all try to do too much, lol Between doing company administration, MCU programming, CPLD and RF development studio softwares and PCB manufacturing softwares .... where is one on top of all that...
  9. 2

    Ramping voltage to current converter?

    Ok so where does my output of my op amp connect to you circuit Between R5 and the power source?
  10. 2

    Ramping voltage to current converter?

    Hello fellows, Ok I need to review all my transistor and op amp theory notes cause I don’t remember a lot of stuff. Also I realized I never really built a voltage controlled current source circuit so I’ve got a lot of work on my plate here :-( So I googled “voltage controlled current source”...
  11. 2

    Ramping voltage to current converter?

    Hi Steve, Thank you for replying ! It’s 5 years ago I haven’t touched this circuit so I’m a littl out of touch.... ☺️ So you mean connect one end of the resistor to the output of my op amp and the other end to of the resistor to the positive of my Led and the other side of my led to ground...
  12. 2

    Ramping voltage to current converter?

    hello, I have a ramping voltage signal of 0.4VDC to 1VDC commingbout of an op amp. I need that signal to control linearly an IR led’s current that can vary from 0-1A. Therefore I want to convert a 0,4VDC-1VDC to 0A -1A Therefore the output of my op amp needs to go to a device that can drive...
  13. 2

    PCB layout software?

    Hello, I was thinking to try and do my own PCB layouts myself And then generate the gerber files so I can Give them to my PCB manufacturer. But I never used such a software and I would like to ask this forum which one I should use? It should allow me to design layouts from the smallest to...
  14. 2

    RF balancing (50 ohm traces, baluns etc...)

    Hi folks, Sorry for the delay! I am using the erf32fg1p133f256gm48 RF MCU from Silabs and here is the kit I bought: https://www.silabs.com/products/development-tools/wireless/proprietary/slwstk6060b-efr32-flex-gecko-915-mhz-2-4-ghz-and-sub-ghz-starter-kit I have been reading up on RF tuning...
  15. 2

    RF balancing (50 ohm traces, baluns etc...)

    Hi Kellys_eye, Thanks for replying, It’s 900 MHZ... I could post the schematics if you want, but what I don’t understand is what is it that they would do when adjusting.... ? Do they just adjust the thickness of the traces or do they also alter the components ??? Also, how do they do...
  16. 2

    RF balancing (50 ohm traces, baluns etc...)

    Hi, I am using an RF MCU chip which comprises an RF transceiver and an MCU. The company that sells this RF chip provides a recommended RF circuit schematic which shows how the device should be wired. The schematic shows the RF MCU along with some external coils baluns and capacitors. I also...
  17. 2

    Measuring the current used in a power supply?

    Ok thanks for you help! 24V
  18. 2

    25V vs 35V capacitor?

    Also on another note... Harald, at the risk of getting scolded for introducing a new question within a question!!!! :-) you say and I quote: "Keep primary and secondary wiring at least > 6 mm apart for safe insulation (air gap and creepage)" Then why do electronic distributors sell header...
  19. 2

    25V vs 35V capacitor?

    Hi Harald Kapp, the UCV1V221MCL1GS is a 220 uF cap! .... see here: https://www.mouser.com/ProductDetail/Nichicon/UCV1V221MCL1GS/?qs=/ha2pyFaduhPs5slRZPWzLPyUAa0Q93akRoIZSGAjIfWnH3h2fuTZw== The power supply I am using is the PBO-5-S3.3 which is a 120VAC to 3.3VDC output at 1A. It is possible...
  20. 2

    25V vs 35V capacitor?

    Hi fellows, So if I understand you all, the one I want to use which better fits in my project in terms of size (digikey part # PCE5009TR-ND) is more suitable for my application since the ripple current is greater capacity than the the first one (digikey part# 493-2205-2-ND). So the 25VDC cap...
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