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This article describes an electrical circuit which is adapted for use as a null detector, an analog-to-digital converter, and a detector of zero crossing of an analog signal.
English (United States)
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100% of the total text.
Page 1 of 2
Bridge Null Detector
This article describes an electrical circuit which is adapted for use as a null
detector, an analog-to-digital converter, and a detector of zero crossing of an
In Figs. 1 and 2, the circuit comprises a full-wave rectifier circuit 10
connected to a bipolar operational amplifier A. via a resistive interconnecting
network 12. In Fig. 1 the output (E(OUT)) is taken directly from the operational
amplifier, while in Fig. 2 the output is taken from the junction formed by a
clamping diode and resistive means 14.
When E(IN) is below the + threshold of the bridge rectifier D(1)-D(4), the
current will not flow through the interconnecting network 12, and the output of the
differential amplifier will be zero.
When E(IN) exceeds the + or - threshold of the bridge rectifier, current will
flow through the interconnecting resistive network, driving E(OUT) to +V.
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