Example implementations relate to performance tests of capacitors. In some examples, a controller may comprise a processing resource to measure a change in voltage of a capacitor of a circuit in response to the controller entering a test mode, determine, based on the measured change in the voltage and an impedance of the circuit, a capacitance of the capacitor, compare the determined capacitance of the capacitor to a predetermined capacitance value, and determine, based on the comparison, a performance of the capacitor.

Example implementations relate to performance tests of capacitors. In some examples, a controller may comprise a processing resource to measure a change in voltage of a capacitor of a circuit in response to the controller entering a test mode, determine, based on the measured change in the voltage and an impedance of the circuit, a capacitance of the capacitor, compare the determined capacitance of the capacitor to a predetermined capacitance value, and determine, based on the comparison, a performance of the capacitor.

An electronic device may have conductive sidewalls and a rear wall. The rear wall may have a first portion mounted to the sidewalls and a second portion protruding away from the first portion to define a cavity. A sensor board may be mounted within the cavity. A coil structure may be mounted within the cavity and surrounding the sensor board. An antenna may have an antenna ground separated from a patch element by an antenna volume. The patch element may include a first conductive trace on the first portion of the rear wall, a second conductive trace on the sensor board, and a conductive interconnect structure that couples the first conductive trace to the second conductive trace. The coil structure may be disposed outside of the antenna to minimize impact of the coil structure on performance of the antenna.

An electronic device may have conductive sidewalls and a rear wall. The rear wall may have a first portion mounted to the sidewalls and a second portion protruding away from the first portion to define a cavity. A sensor board may be mounted within the cavity. A coil structure may be mounted within the cavity and surrounding the sensor board. An antenna may have an antenna ground separated from a patch element by an antenna volume. The patch element may include a first conductive trace on the first portion of the rear wall, a second conductive trace on the sensor board, and a conductive interconnect structure that couples the first conductive trace to the second conductive trace. The coil structure may be disposed outside of the antenna to minimize impact of the coil structure on performance of the antenna.

An apparatus includes an enclosure, a first ferrite core disposed inside the enclosure, a wireless power receiver that includes a first receiving coil wrapped around the first ferrite core between the first ferrite core and the enclosure, and an alignment mark configured to be aligned with a center of a transmitting coil of a wireless power transmitter, wherein the alignment mark is not aligned with a center of the first receiving coil.

An apparatus includes an enclosure, a first ferrite core disposed inside the enclosure, a wireless power receiver that includes a first receiving coil wrapped around the first ferrite core between the first ferrite core and the enclosure, and an alignment mark configured to be aligned with a center of a transmitting coil of a wireless power transmitter, wherein the alignment mark is not aligned with a center of the first receiving coil.

An electronically controlled mechanical watch includes a mechanical energy source, a power generator including a rotor driven by the mechanical energy source, a capacitor configured to be chargeable and accumulate electrical energy generated by the power generator, and a crystal oscillation circuit including a crystal oscillator and an oscillation circuit and configured to stop oscillating when a voltage of the capacitor falls below an oscillation stop voltage and to start oscillating when the voltage exceeds an oscillation start voltage higher than the oscillation stop voltage. The watch also includes a temperature compensation circuit configured to perform a temperature compensation function operation compensating for variation of a reference signal due to a temperature, a first voltage detection circuit configured to detect that the voltage exceeded a first voltage that is set higher than the oscillation start voltage, and a control circuit configured to stop the temperature compensation function operation of the temperature compensation circuit until the first voltage detection circuit detects that the voltage exceeded the first voltage.

A watch is provided that includes a constant current circuit including: a plurality of transistors coupled in series between a first power supply and a second power supply, the first power supply being a power supply of a high potential side power supply, the second power supply being a power supply of a low potential side power supply; a plurality of connection wiring lines each provided for each of the plurality of transistors, and configured to couple the first power supply and a terminal on the first power supply side of each of the plurality of transistors; a non-disconnected fuse provided in a non-disconnected state to one connection wiring line of the plurality of connection wiring lines, and a disconnected fuse provided in a disconnected state to a connection wiring line other than the one connection wiring line of the plurality of connection wiring lines.

A liquid powered assembly including a housing; a removable bottom base; a seal; an electrolyte battery assembly; and, a liquid powered device is described. The housing includes an upper end portion and a lower end portion. The housing has a volume for containing an electrolyte solution. The lower end portion has a fluid inlet. The removable bottom base has a bottom surface for supporting the liquid powered assembly. A seal engages the housing and the removable bottom base to help contain the liquid. An electrolyte battery assembly is positioned within the housing. A liquid powered device is operably attached to the electrolyte battery assembly. To function, the housing and the removable bottom base are detached relative to each other and the housing is turned substantially upside down to allow filling of the housing via the inlet. The bottom base is then attached to the housing and the assembly is then inverted for use.

A liquid powered assembly including a housing; a removable bottom base; a seal; an electrolyte battery assembly; and, a liquid powered device is described. The housing includes an upper end portion and a lower end portion. The housing has a volume for containing an electrolyte solution. The lower end portion has a fluid inlet. The removable bottom base has a bottom surface for supporting the liquid powered assembly. A seal engages the housing and the removable bottom base to help contain the liquid. An electrolyte battery assembly is positioned within the housing. A liquid powered device is operably attached to the electrolyte battery assembly. To function, the housing and the removable bottom base are detached relative to each other and the housing is turned substantially upside down to allow filling of the housing via the inlet. The bottom base is then attached to the housing and the assembly is then inverted for use.