This is a 1500W hairdryer, death caused by thermal switch failure.
This is the switch unit. Attached are two suppression capacitors & a blocking diode. Cold switch is on right.
Heating element unit removed from housing. Coils of Nichrome wire heat the air passing through the dryer. Fan unit is on right.
Other side of the heating element unit, here can be seen the thermal switch behind the element winding. (Black square object).
The fan motor in this dryer is a low voltage DC unit, powered through a resistor formed by part of the heating element to drop the voltage to around 12-24v. Mounted on the back of the motor here is a rectifier assembly. Guide vanes are visible around the motor, to straighten the airflow from the fan blades.
5-blade fan forces air through the element at high speed. Designed to rotate at around 13,000RPM.
This is the Current Cost CC128 Real Time Power Meter. Shown here is the display unit, British Gas issued these free to some customers.
This unit measures current power draw in Watts, cost of power currently being used (requires unit price to be set), overall kWh usage over the past 1, 7 or 30 days & power trends during the day, night & evening. Also displays current time & current room temperature.
Here the front panel of the display has been un-clipped. At the bottom are the RJ-45 serial port & power connections.
This unit uses a PIC micro-controller as it’s CPU (PIC18F85J90) Just above & left of the CPU is the 433MHz SPD radio receiver module. The chips on the right of the CPU are a 25LC128 SPI serial EEPROM for data storage & a 74HC4060 14 stage binary counter, to which is connected the 32kHz clock crystal. The red wire around the top of the display is the antenna for the radio receiver.
For more info on the CC128 in general, the serial port & software for computer data logging, see this link
See this link for Current Cost’s list of software
Closeup of the ICs on the mainboard.
Here we have the transmitter unit, with Current Transformer (CT). The red clamp fits around one of the electric meter tails & read the current going to the various circuits. This unit is powered by 2x D cells, rated at a life of 7 years.
The PCB inside the transmitter. Again very minimal design, unknown controller IC, 433MHz radio transmitter on right hand side with wire antenna. Two barrel connectors on left hand side of board allow connection of up to two more CT clamps for measurement of 3-phase power. Centre of board is unmarked header. (ICSP?)
CT unit. Inside is a coil of wire & an iron core which surrounds the cable to be measured.
This is a Western Digital drive recently removed from my laptop when it died of a severe head crash.
Top of drive can be seen here.
Here the cover has been removed from the drive, showing the platter, head arm & magnet. Yellow piece top left is head parking ramp.
The head assembly of the drive is shown here. The head itself is on the left hand end of the arm in the plastic parking ramp. The other end of the arm holds the voice coil part of the head motor, surrounded by the magnet.
Bottom of drive, with controller PCB. SATA interface socket at bottom.
PCB removed from bottom of drive. Spindle motor connections & connections to the head unit can be seen on the bottom of the drive unit.
Controller PCB. Supports the cache, interface & motor controller ICs.
Closeup of the motor driver IC, this controls the speed of the spindle motor precisely to 5,400RPM. Also controls the voice coil motor controlling the position of the head arm on the platters.
Interface IC closeup. This IC receives signals from the head assembly & processes them for transmission to the SATA bus. Also holds drive firmware, controls the Motor driver IC & all other functions of the drive.
Cache Memory IC.
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