Abstract: A bicycle signal processing device includes a first bicycle signal processing element that generates a first signal having a first impedance, an external output terminal having an exposed output contact surface, and an impedance converting circuit coupled between the first bicycle signal processing element and the external output terminal for converting the first signal to a second signal having a second impedance at the external output terminal.

Abstract: A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power includes a voltage sensor for sensing a voltage from the first power supply. A control unit is coupled to the voltage sensor and is coupled for receiving power from the first power supply and the second power supply. The control unit outputs power from the second power supply when the voltage sensed by the voltage sensor is below a selected value, and the control unit outputs power from the first power supply when the voltage sensed by the voltage sensor is above the selected value.

Abstract: A bicycle electrical control circuit provides power and control signals to a plurality of bicycle components. The circuit comprises a power circuit that provides a power signal for the plurality of bicycle components, a control circuit that provides a control signal that controls at least one of the plurality of bicycle components, and a power stabilizing circuit coupled to the power circuit. The power stabilizing circuit stabilizes power provided from the power signal to at least one of the plurality of bicycle components.

Abstract: A circuit for a bicycle control device comprises a processor, a signal divider coupled to the processor, and a switch coupled to the signal divider so that operating the switch causes a signal input to the processor to change between at least a first signal value and a second signal value. The processor performs a first operation when the first signal value is input to the processor, and the processor performs a second operation when the second signal value is input to the processor.

Abstract: A bicycle signal processing device includes a first bicycle signal processing element that generates a first signal having a first impedance, an external output terminal having an exposed output contact surface, and an impedance converting circuit coupled between the first bicycle signal processing element and the external output terminal for converting the first signal to a second signal having a second impedance at the external output terminal.

Abstract: A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power includes a voltage sensor for sensing a voltage from the first power supply. A control unit is coupled to the voltage sensor and is coupled for receiving power from the first power supply and the second power supply. The control unit outputs power from the second power supply when the voltage sensed by the voltage sensor is below a selected value, and the control unit outputs power from the first power supply when the voltage sensed by the voltage sensor is above the selected value.

Abstract: A recording material employing at least one leuco dye having formula (I), which is colored when brought into contact with a color developer capable of inducing color formation in the leuco dye: ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, which R.sup.1 and R.sup.2 may form a ring in combination or a morpholine ring through an oxygen atom; R.sup.3 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or an aralkyloxy group; R.sup.4 and R.sup.5 each represent an alkyl group having 1 to 4 carbon atoms; and R.sup.6 represents hydrogen, an alkyl group having 1 to 4 carbon atoms or a halogen.