This is an old legacy wireless mouse from Logitech. This uses a ball rather than optical technology.
Bottom of the mouse, showing the battery cover & the mouse ball.
Top removed from the mouse, showing the PCB inside. The smaller PCB on the left supports the microswitches for the buttons & mouse wheel.
Closeup of small PCB showing the microswitches & the IR LED & phototransistor pair for the mouse wheel encoder.
View of main PCB, with interface IC lower right. Pair of quartz crystals provide clocking for the transmitter & internal µC.
Battery contacts are on lower left of the PCB. At the top are the IR pairs for the X & Y axis of the mouse ball.
Closeup of the pairs of IR LEDs & phototransistors that make up the encoders for X/Y movement of the mouse, together with the slotted wheels in the mouse base that rotate with the ball. Steel wire around the smaller PCB is the antenna.
This is the internals of a motorised valve for central heating systems. Here the top is removed showing the motor & microswitch.
Left side of the valve, showing the gearing under the motor, & the valve body under the powerhead.
Right side of the valve, showing the sprung mechanism of the valve quadrant.
Here the motor has been removed from the powerhead, showing the microswitch & the sprung quadrant gear. This spring keeps the valve closed until the motor is energized. The motor remains energized to hold the valve open.
Here the valve body has been opened showing the internal components. The rubber valve rotates on the shaft, blocking the lower port of the valve when in operation.
The motor’s protective cap has been removed here showing the rotor. This is a synchronous motor, of a special type for use in motorised valves. As the windings need to be continuously energized to hold the valve open, it is designed not to burn out under this load. 240v AC 50Hz, 5RPM.