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Adjustment for the dancing lights controller |
  Adjustment of the signal amplifier bias It adjusts the base electric current to work the signal amplifier in the class "A" amplification. It adjusts the resistance value of the base for the collector voltage of the amplifier to become about 6 V in the condition not to input the signal to. At the circuit which I made this time, hFE of the transistor was to do about 115 being. When making the base resistance value R1=1M-ohm¤ R2=220K-ohm, the collector voltage became about 6 V. There is not an influence even if the bias shifts little because this amplifier is not the amplifier to hear the music. Adjustment of the signal level detection reference voltage It adjusts each reference voltage. I adjusted in the 0.5-V interval.
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