A resistive etching solution containing thiourea, which is particularly suitable for etching an electrically resistive material comprised of a nickel-chromium alloy. A microphone directed to the front side of the front surface in the condition where the lid is opened is provided at the front surface of the apparatus body. The delay locked loop receives a reference clock signal having a time period equal to the desired time delay and adjusts a control current level in the second current controlled delay line until a delay of the second current controlled delay line matches the time period of the reference clock signal. The auxiliary converter is designed to draw a minimum amount of energy, only enough to maintain the information handling system in the standby or shutdown mode of operation.