Here are the viewfinder electronics from a 1984 Hitachi VHS Movie VM-1200E Camcorder. These small CRT based displays accept composite video as input, plus 5-12v DC for power.
Here is the front face of the CRT, diameter is 0.5″.
Closeup view of the PCB, there are several adjustments & a pair of connectors. Socket in the upper left corner is the power/video input. Pinout is as follows:
Brown – GND
Red – Video Input
Orange – +12v DC
Yellow – Record LED
The potentiometers on the PCB from left:
PCB Part Number reads: EM6-PCB
This unit utilises the BA7125L deflection IC.
Reverse side of the PCB, very few SMT components on this board.
Here is an overall view of the CRT assembly with scan coils. Tube model is NEC C1M52P45.
Closeup view of the CRT neck, showing the electron gun assembly.
The old CCTV camera used to feed a composite signal to the CRT board. Sanyo VCC-ZM300P.
Connections at the back of the camera. Red & Black pair of wires lead to 12v power supply, Green & Black pair lead to the CRT board’s power pins. Seperate green wire is pushed into the BNC video connector for the video feed. video ground is provided by the PSU’s ground connection.
Finally the connections at the CRT drive board, left to right, +12v, Video, GND.
Here is a Inductive charger designed for the Nintendo DSi. Cheap Chinese build, but it does work!
Top has been removed from the unit here. Most prominent in the centre is a solid steel bar, simply there to give the device some weight.
Pair of Tri-colour LEDs at the front indicates charging status.
Induction coil is on the left, with the controller & oscillator PCB at the top.
Closeup of the PCB, ICs have had their markings ground off.
Induction coil. This couples power into a coil built into a special battery, supplied with the base, to charge it when the DSi is placed on the dock.
Information Label on the base.
Standard DSi charger port, connects to the charger you get with the DSi. Power switch is on the right.
An old IDE interface Zip drive. This fits in a standard 3.5″ bay.
Top cover removed from the drive, IDE & power interfaces at the top, in centre is the eject solenoid assembly & the head assembly. Bottom is the spindle drive motor.
Head assembly with the top magnet removed. Voice coil is on the left, with the head preamp IC next to it. Head chips are on the end of the arm inside the parking sleeve on the right. Blue lever is the head lock.
Controller PCB removed from the casing.
Spindle motor. This is a 3-phase DC brushless type motor. Magnetic ring on the top engages with the hub of the Zip disk when insterted into the drive.
Magnets that interact with the voice coil on the head assembly.
Head armature assembly removed from the drive. The arm is supported by a pair of linear bearings & a stainless steel rod.
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