Abstract: The present invention provides a vacuum tube audio amplifier which includes an audio pre-amplifying portion and an audio output transforming portion. The audio pre-amplifying portion includes an equalizer for enhanced sound quality and amplifies an audio signal, which is subsequently transmitted to the audio output transforming portion. Furthermore, the audio output transforming portion includes an audio output transformer which includes a plurality of stacked E-shaped silicon steel sheets and a plurality of stacked I-shaped silicon steel sheets, wherein the stacked E-shaped silicon steel sheets and the stacked I-shaped silicon steel sheets have a same height which is smaller than or equal to 48 mm.
Abstract: The invention provides a grounding structure and a grounding method for a vacuum tube audio amplifier, the grounding structure and the grounding method including: with respect to a power source, utilizing a power circuit without a choke, an anti-coupling circuit, and a filament voltage regulator circuit; and with respect to the grounding method, utilizing an negative output terminal of an audio output transforming circuit or a negative terminal of a filter capacitor in the power circuit as a single ground terminal of the vacuum tube audio amplifier, and not arranging a grounding metal bottom plate therein, in order to achieve a compact, lightweight desktop model of a vacuum tube audio amplifier.
Abstract: The present invention provides an apparatus for controlling an electronic stop watch. The apparatus comprises a controller and a transmission media. The controller includes a keyboard for inputting a datum and an output port outputting the datum to the electronic stopwatch. The transmission media connects the electronic stopwatch with the controller, through one of a wire connection and a wireless connection.
Abstract: A signal transmitting belt for transmitting a heartbeat signal to a heart rate monitor is provided, which shows a cardiorespiratory information. The signal transmitting belt includes: a main body comprising a signal transmitter for transmitting the heartbeat signal, an insulating chest belt, a connecting element connecting the main body and the insulating chest belt for sustaining a tension therebetween, and a conductive chest belt mounted on the insulating chest belt for contacting a chest of a user so as to detect the heartbeat signal and then transmit the heartbeat signal to the signal transmitter.
Abstract: A manufacturing method for a signal transmitting belt of a heart rate monitor is provided. The steps includes: (a) providing an injection molding assembly, a conductive chest belt, and a first shaft body; (b) placing the first shaft body and the conductive chest belt inside the injection molding assembly and injecting a molding material into the injection molding assembly to form an insulating chest belt; (c) removing the first shaft body; (d) providing a main body; and (e) mounting a second shaft body at a same position of the first shaft body for connecting the insulating chest belt and the main body so as to accomplish the signal transmitting belt.
Abstract: An electronic trip meter for a bicycle is provided. The electronic trip meter for a bicycle includes a signal generator and a main unit. The signal generator is used for generating a signal each time the bicycle travels over a specific distance, and the main unit is used for receiving the signal, evaluating and displaying the riding data, and generating an alert signal to remind the rider to execute a maintenance operation when the riding distance or the riding time exceeds a preset riding distance or a preset riding time.
Abstract: A device for demonstrating and testing electronic meters for bicycles including a body portion having a slot, a rod mounted on the body portion, a plurality of seats mounted on the rod, a first magnet fitted on the body portion, a handwheel partially pivotally fitted in the slot of the body portion, a second magnet fitted on a the handwheel, and an electronic testing device disposed within the body portion and operatively connected with the seats, whereby the device can be used for demonstrating as well as testing electronic meters for bicycles.