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I am building a CRO. I made a circuit for it but I am not able to figure out which parts to use. Can anyone suggest low noise high frequency (at least 1 MHz unity gain) op amp which can give at least 15 mA output ? Also I am finding IC capable of producing 100 kHz PWM signal at 1% or lower duty cycle.

BaLi
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    The difficulty is probably not in finding an op-amp with the desired gain bandwidth or low noise rating, but finding all of that at the high voltages required to drive a cathode ray tube. Are you seriously building an oscilloscope with a CRT, or are you just building a digitizer that will display the results on an LCD or computer display? Also, what's with the 100 kHz PWM circuit? What do you plan to do with it? – JRE May 19 '21 at 18:37
  • I am attempting to modify my old CRT TV to CRO. It uses magnetic field for deflecting electrons. I am using op amp to amplify sawtooth wave for driving bjts which will then drive coils for horizontal deflection. similar for vertical deflection. yes i want op amps with around +-15 max volt input. 100khz pwm is for producing sawtooth wave. – BaLi May 19 '21 at 18:45
  • You will not be able to get more than audio bandwidth with magnetic deflection. – Spehro Pefhany May 19 '21 at 18:46
  • i know that. but i am not a professional so don't want to blow hole in my pocket for equipments. – BaLi May 19 '21 at 18:49
  • You can get a scope for a couple hundred$ – Tony Stewart EE75 May 19 '21 at 18:59
  • Your horizontal flyback transformer only goes at a fixed frequency unless you DIY XY mode – Tony Stewart EE75 May 19 '21 at 19:00
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    Please move the information about your project goals into the main body of the question, that way readers won't have to search for it in the comments. – Theodore May 19 '21 at 19:03
  • @TonyStewartEE75 audio bandwidth for much less (in fact, for AC, your soundcard or a 3€ USB sound card does just fine, and the bit depth is astonishing) – Marcus Müller May 19 '21 at 19:48
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    Yes audio DSO’s are free open software using sound card with > 4 or 5 decades @MarcusMüller – Tony Stewart EE75 May 19 '21 at 21:17

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