This is an old cordless landline phone, with dead handset batteries.
Here’s the handset with the back removed. Shown is the radio TX/RX board, underneath is the keyboard PCB with the speaker & mic. All the FM radio tuning coils are visible & a LT450GW electromechanical filter.
Radio PCB removed from the housing showing the main CPU controlling the unit, a Motorola MC13109FB.
The keypad PCB, with also holds the microphone & speaker.
Bottom of the keypad board, which holds a LSC526534DW 8-Bit µC & a AT93C46R serial EEPROM for phone number storage.
Here’s the base unit with it’s top cover removed. Black square object on far right of image is the microphone for intercom use, power supply section is top left, phone interface bottom left, FM radio is centre. Battery snap for power backup is bottom right.
PSU section of the board on the left here, 9v AC input socket at the bottom, with bridge rectifier diodes & main filter capacitor above. Two green transformers on the right are for audio impedance matching. Another LT450GW filter is visible at the top, part of the base unit FM transceiver.
Another 8-bit µC, this time a LSC526535P, paired with another AT93C46 EEPROM. Blue blob is 3.58MHz crystal resonator for the MCU clock. The SEC IC is a KS58015 4-bit binary to DTMF dialer IC. This is controlled by the µC.
Underside of the base unit Main PCB, showing the matching MC13109FB IC for the radio functions.
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.