Abstract: The present circuit is primarily designed to be employed with a transducer which generates a signal in response to some physical phenomenon and said present circuit provides a direct current signal which is an excellent representation of the intensity of said physical phenomenon. In addition said circuit has excellent response over a broad frequency range as related to said physical phenomenon and has high signal to noise ratio. The present circuit principally utilizes a low pass filter which provides a relatively flat response at all frequencies below one-half of the carrier frequency as well as employing a notch filter designed to filter signals at twice the carrier frequency. The twice filtered signal is a low ripple direct current signal having the earlier described characteristics.