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  • square wave -- gt;sine using passive bandpass filter - Eng-Tips
    I'm designing a circuit that will take a square wave generated by a microprocessor and feeds it through a bandpass filter to get a sine wave The application will be to provide a tone for morse code to a handheld ham radio on board a small satellite Right now im considering remaining simple by using a 1st order passive bandpass filter that uses a capacitor and inductor in series Assuming
  • Impedance Measurement of a DC-DC power supply | Eng-Tips
    A clamp-on current probe usually has a limited frequency range, but there are Fluke DC - several hundred kHz clamps And Chauvin-Arnoux and Tektronix going well beyond 1 MHz
  • PWM Frequency for DC Motor Control | Eng-Tips
    As a practical matter, 15 to 20 kHz is the usual switching frequency for motor drives This is so that audable noise is not a problem The ripple current will also be low for common values of motor inductances (current ripple increases the motor heating)
  • how to interface a differential op-amp to a single ended output
    I would like to have a regular op-amp (single ended) input driven via differential outputs from a differential op-amp I assume this will be better than going to a single ended configuration right after the diff op-amp (typical configuration) The question is how to best interface the ad8137 in
  • Vibration conversion | Eng-Tips
    I am in the electronics repair and calibration field and am required to calibrate vibration (a first for me) The calibration is no problem, but I need to convert the units my engineers gave me in vibration (mV g) in to what my test equipment reads (mm s) Does anyone know
  • Harmonics in Grid - How to measure | Eng-Tips
    It depends how high of frequencies you want to measure accurately For CTs, they're generally pretty good up to 25th to 32nd harmonic For VTs, oil-filled VTs are normally decent up to about 1 kHz
  • Offline flyback input capacitor ripple current - Eng-Tips
    Hello, I am doing an offline, isolated, flyback with:- Vout = 36V Vin = 85-265VAC Primary Side DC Bus Electrolytic Capacitor = 68uF , 400V (Panasonic EEUEE2G680) Switching frequency = 58100KHz DC Bus cap datasheet
  • Chasing Down Motor Whine - Eng-Tips
    It will be driven by a VFD First I assumed the whine was because of the VFD's switching frequency (SF), but I tried two different VFDs at every available SF up to 16 kHz with no change to the whine I then pull-started it and ran it on single phase 220v, which confirmed the whine is not VFD-related I turned the motor passively without energizing it using a different motor and a v-belt; It
  • Material Spec for High Partial Pres. H2S Gas Pipeline | Eng-Tips
    The ISO 3183-3 requirement for HFW pipe is a minimum 150 kHz welding current frequency Of the 2 or 3 pipe mills that I would be happy taking sour service HFW from (based on detailed appraisals), none of them use less than 250 kHz if I recall correctly
  • sharing signal and power ground | Eng-Tips
    I generally share the signal and power ground together for analog (and mixed circuits <1 KHz) Does this practice introduce noise in the system The circuits many times does not work if I separate them, so I am forced to do it to make it work Am I missing something about designing here Sort by date Sort by votes Aug 29, 2005 #2





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