Is it OK to use wirewound resistors in an oscillator circuit?

Discussion in 'General Electronics Chat' started by lokeycmos, Jan 23, 2013.

  1. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
    7
    im wondering if it is acceptable to use wirewound(thus inductive) resistors in a oscillating circuit? the circuit in question is here:

    http://danyk.wz.cz/igbt_2.html

    now i was able to salvage the 4.7ohm snubber resistor(also have a 5 ohm 5 watt that is close enough) and the two 15 ohm gate resistors off of some scrap circuit boards. they are all wirewound and have inductance to them. from top to bottom in the pic 40uH, 50uH, and 150uH.i found the 100k 2 watt also with inductance. i may be wrong and would like some verification, but seems to me it would be a bad idea. thanks for your input!
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,052
    3,244
    What is the operating frequency of the circuit? At the operating frequency the inductive reactance may be negligible as compared to the resistance.
     
  3. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
    7

    20khz to 25khz
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,052
    3,244
    50μH has 7.85Ω reactance at 25kHz, so those resistors might not be the best for your application.
     
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