headphone – Experimental Engineering

Posted on February 28, 2011February 10, 2011 by The Engineer — Leave a comment

Sanyo Talkbook VAS

Here is a Sanyo tape recorder, with built in voice activation. Takes standard audio cassettes.
Here visible is the speaker on the left, microphone is on the right of the tape window. The tape counter is at the top.

Back cover removed from the unit, showing the PCB & the connections. The IC is the controller/amplifier.

Top of the PCB, control switches, volume potentiometer & microphone/headphone sockets on the right. DC power jack top left. Switch bottom centre senses what mode the tape drive is in.

Rear of the tape deck, main drive motor is bottom right, driving the capstan through a drive belt. This drives the tape spools through a series of gears & clutches. Belt going to top left drives the tape counter.

Front of the tape drive. Read/write head is top centre. Blue head is bulk erase head used during recording.

Main speaker. 8Ω 0.25W.

Simple mechanical tape counter.

Posted on February 12, 2011February 10, 2011 by The Engineer — Leave a comment

iPod

Old iPod with damaged screen. Here is the front with the Click Wheel.

Cover removed from the back, here the HDD is the biggest visible part.

Back cover removed from the unit, here is the back of the screen & the main PCB.

Back cover with the battery & headphone jack PCB.

Closeup of the Li-Ion battery.

Front removed from the unit, the touch sensitive Click Wheel PCB is folded away from the mainboard here.

Tactile switches underneath the Click Wheel.

1.8″ hard drive. Toshiba MK3008GAL.

Posted on August 26, 2010 by The Engineer — Leave a comment

Motorola V360v

Here is a more modern phone, the Motorola V360v. Features include Dual screens, 640×480 VGA camera, full col

our TFT Main LCD, SD-Micro slot.
Here on the back the grey scale LCD can be seen, with the camera lens to the right of the Motorola logo

Here the phone is opened showing the keypad & the full colour TFT LCD display.

Here the battery is removed from the unit, showing the SIM connector. The antenna cover is still on at the bottom.

The antenna cover has been removed in this shot, the antenna is the white section at the bottom, With the loudspeaker & the external antenna connector hidden at the right.

Here is the main PCB. Parts from left are the Bluetooth module at the top, supplied by Broadcom, the SD Card socket at the bottom. Main CPU next to that is the Freescale SC29343VKP. Above right of the CPU is the Freescale SC13890P23A Charger, Power & Audio IC. Below is the SIM card socket. Under the main CPU is the Intel Flash memory IC. ICs inside the shields are the RF sections for transmit & receive.

Rear of the display unit showing the monochrome LCD. The camera module on the bottom left. Ear speaker on the far right of the unit.

Main colour TFT LCD.

Camera module removed from the LCD unit.

The vibration motor attached to one of the LCD looms.