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Recent content by janfred

  1. J

    Eagle - Ripup but connected

    Yes :) I already did that after your first message. Thanks Kick :-)
  2. J

    Eagle - Ripup but connected

    of course you are. The GND plate was isolated from the rest so I needed to insert some vias. actually that was total obvious .. I failed this morning... :drevil:
  3. J

    Eagle - Ripup but connected

    haha :idea: damn! thanks
  4. J

    Eagle - Ripup but connected

    Hi guys, i've a problem... Eagle still shows me an airline(ripup-line) although it's connected by the GND-Layer and the Pads. I did Ratsnest a couple of times, I tried a new GND-Polygon and I also checked the Schematics.. everything fine.. - How can I solve that? - And by the way...
  5. J

    impedance matching needful?

    Hi there, I designed a circuit for a measurement-task. 230VAC will be transformed into ± 12VDC (normal procedure.. transformer-> bridge rectifier -> 78XX/79XX. Of course there are some filter to eliminate noise. After voltage regulation, the ± 12VDC will supply an operation amplifier which...
  6. J

    Dist. Problems with Amp (AD8065)

    dammit! sorry but I am really upset about myself for being so distracted with the schematic. makes sense with the highpass filter.. I worry cause I want to use that setup for measurement.. the input is green - output is yellow. I will change my circuit and correct the mistake with the (+) and...
  7. J

    Dist. Problems with Amp (AD8065)

    the present question was... if it's a good idea to try these two layouts?? but I already did.. the first circuit was great but I had to add a 5pF capacitor in serie to the output (if not so there will be a dc-offset). Like so, I have a good result but also a drift from the generated...
  8. J

    Dist. Problems with Amp (AD8065)

    is there anybody who can help me?
  9. J

    What is the difference between IPD and MOSCap

    Hi, I found an old thread here. For the MOSCap https://www.edaboard.com/threads/212560/ Sorry that I couldn't help you with the IPD's (only found something on wikipedia but I think you already read that)
  10. J

    Dist. Problems with Amp (AD8065)

    so thats why you became so rich and that guru at the end Audioguru :-P Little joke you know... but alright. I will try to built two circuits. The first will be the circuit from the AD datasheet with G=+1 and in this case it's an impedance follower right? The second will be the impedance...
  11. J

    Dist. Problems with Amp (AD8065)

    The Ground from the scope and the signal source are the same... but actually as you said.. there are connection in form of wire which has a length of 10-15 cm (average).. So after reading your replies I think that I'm really getting these sort of loop antenna. Do you think it's possible to...
  12. J

    Dist. Problems with Amp (AD8065)

    Well... sorry that I didnt show that in the schematics... That was my fault! Of course the connection of +/- 12 VDC is connected and also the connection to ground. I made the schematics very fast and so I forgot to draw that. So lets assume that the connection of Source and the clearing of the...
  13. J

    Dist. Problems with Amp (AD8065)

    Hi guys... I tried to build up an impedance converter with the AD8065 on a breadboard. After seeing that there are a lot of problems due to distortion and noise I made some screens with the scope.. Here is the last circuit I built and the screens from the scope/ the waveform generator...
  14. J

    Galvanic Isolation of RF-Signals (AC)

    right now I only have this information about the rf-generator which generates the signals Source of the rf-generator 100 - 120 V, 50/60 Hz, 12 A The generated signals: it depends on which settings.. so about 0 - 600 W, 900 V, Resistance of 0 - 2 kOhm I know that the voltage in the electrolytic...
  15. J

    Galvanic Isolation of RF-Signals (AC)

    Hey, thanks. I found some RF transformers (such as T-622-X65) but I have concerns about the insertion loss... Wouldn't this distort my signal?

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