Abstract:
A portable door lock includes a stop member and a connection plate, wherein the stop member has a slot defined therethrough and a rod is movably engaged with the slot. The stop member has two flat sides and one of which is to be contact an inside of a door. The connection plate has a hole and a tongue splits from the hole so as to be inserted in a recess in a door jamb. Two positioning holes are defined through the connection plate so that the connection plate cab be fixed to the door jamb. At least one engaging hole is defined through the connection plate so that the rod is engaged with the at least one engaging hole. A chain is connected between the stop member and the connection plate. The connection plate does not disengage from the doorjamb when the door is opened.
Abstract:
A holding device includes a U-shaped base fixed on a wall and including a first protrusion and a second protrusion. A receiving space is defined between the two protrusions. The first protrusion has a hole defined in an inside thereof and a clamping member is eccentrically received in the first protrusion and a part of the clamping member is movably extended through the hole and protrudes into the receiving space. A shank of a tool is received in the receiving space and clamped by the clamping member and the second protrusion.
Abstract:
An automatic gain control circuit includes a first voltage dividing resistor, a filter circuit, a switch circuit, and an amplifying circuit. The first voltage dividing resistor divides a voltage of the automatic gain control circuit using an internal impedance of the audio device to produce a divided DC voltage, wherein the first voltage dividing resistor is connected between a first power source and an output of the audio device. The filter circuit filters audio signals outputted from the audio device to produce filtered audio signals, and wherein the filter circuit receives the divided DC voltage, wherein the filter circuit is connected to the output of the audio device. The switch circuit outputs controlling signals according to the divided DC voltage from the filter circuit. The amplifying circuit amplifies the filtered audio signals according to the controlling signals. An electronic device using the automatic gain control circuit is also provided.
Abstract:
An inrush current restraining circuit (100) includes a power source (Vcc), a charging/discharging circuit (11), a switching circuit (13), a first impedance component (Z1), a second impedance component (Z2), and a controller (10). The charging/discharging circuit is connected to the power source. An input of the switching circuit is connected to the charging/discharging circuit, and an output of the switching circuit is defined as an output of the inrush current restraining circuit. One end of the first impedance component is connected to the power source. The second impedance component is connected between the other end of the first impedance and the switching circuit. The controller is connected a joint of the first impedance component and the second impedance component, for providing a control signal.
Abstract:
A holding device includes a base including a first protrusion and a second protrusion with a receiving space defined between the two protrusions. The first protrusion has a hole defined in an inside thereof and a clamping member is eccentrically received in the first protrusion so that a friction portion of the clamping member is movably extended through the hole and protrudes into the receiving space. A shank of a tool is received in the receiving space and clamped by the clamping member and a friction plate on the second protrusion. A cover is received in the first protrusion from an open rear end of the base so as to prevent foreign objects from entering the first protrusion.
Abstract:
A holding device includes a base including a first protrusion and a second protrusion with a receiving space defined between the two protrusions. The first protrusion has a hole defined in an inside thereof and a clamping member is eccentrically received in the first protrusion so that a friction portion of the clamping member is movably extended through the hole and protrudes into the receiving space. A shank of a tool is received in the receiving space and clamped by the clamping member and a friction plate on the second protrusion. A cover is received in the first protrusion from an open rear end of the base so as to prevent foreign objects from entering the first protrusion.
Abstract:
A quick installing device for a tool holder for holding handles of tools includes a plurality of first members fixed to a rear side of the case of the tool holder and a plurality of second members are fixed on a wall. The second members has two extension plates on two sides thereof so as to define two grooves between the second plate and the extension plates. Two sides of the first members are slidably engaged with the grooves of the second members.
Abstract:
A portable door lock includes a stop member and a connection plate, wherein the stop member has a slot defined therethrough and a rod is movably engaged with the slot. The stop member has two flat sides and one of which is to be contact an inside of a door. The connection plate has a hole and a tongue splits from the hole so as to be inserted in a recess in a door jamb. Two positioning holes are defined through the connection plate so that the connection plate cab be fixed to the door jamb. At least one engaging hole is defined through the connection plate so that the rod is engaged with the at least one engaging hole. A chain is connected between the stop member and the connection plate. The connection plate does not disengage from the doorjamb when the door is opened.