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EBL 840 9V Charger with 600mAh Battery – Review

Posted by jimstech on May 14, 2016

It’s been some months, i thought of buying a 9v rechargeable battery for my wireless audio equipments. But from the past experience which i got from the AA rechargable batteries supported by useless chargers made me to do some research which took some months to take a decision.

Upon arriving a closer point of purchase, the decision was to buy a simple and cheap charger controlled by a MC/ MP. with some reviews from here and there from the internet and audio forums, the product which i bought is EBL 840 with 2 pieces of 600mAh battery for $36 inclusive of International shipping to India.

Amazon link for buying EBL 840



Input: 100-240V AC 50/60Hz 120mA
Output: 1.2V DC 200mA;3.6V DC 150mA;9V DC 100mA
No Load Power Consumption: 1W MAX
Full Load power consumption: 5W MAX
Battery Charge Rate: >80%

Compatible with:
6F22(9v) li-ion Battery
6F22(9v) Ni-MH/Ni-Cd Battery



After receiving the product, the first impression is the packaging which was good enough to withstand vibration and sudden drops. Preliminary checks are done with voltage readings on both the 6F22 batteries and the charger. The first-worst experience is the one, Needless to say, the 2 page mini user guide which is an absolute crap of no matching information.

Alright, since i have paid more than INR-2k for this product the internal guy inside me was very curious to see the internal circuit and components used. Housing was good with US standard attached power plug at the rear top area. The whole device was secured with just 2 screws which made the disassembly job very easy.

Initial catch was the markings in the PCB which states that the original manufacturer is Beston (BST), a china manufacturer who has some good reputation in European countries among their products. The same circuit model (BST-C818) is also listed on their website. My device is tagged as design version(v1) relesed in the late year of 2014.


HOT Area:

The first component which catch’d my eye upon removing the top housing is the transformer. Circuit design is very simple with not much safety components. AC line is directly connected to the SMD Bridge Rectifier via 10 ohms 1/2 watt resistor in series and there is no pre line filter’s. Output from the BD is filtered by a 400v E-Cap and sent to switching transistor with some mega ohms resistor in parallel connected with a zener and 104  ceramic capacitor in between.As asusal in all SMPS circuits, the switched voltage is feeded to mini transformer which isolates the High-low voltage area.


EBL 840 – internal front view


COLD Area:

Output stage of the transformer is again stabilized with some resistors and zener’s with a single SMD capacitor. Single comparator for each battery terminal is connected with the LED indicators. But these comparators also sense’s the inflow current to batteries which is under charge. There is a SMD which has 5H5 named on it which is a step down constant DC-DC 600ma IC that controls the entire charging process. It also has an feedback pin which controls the output when the battery is fully charged.


EBL 840 – internal rear view

Overall, this charger is a compact one with a variable voltage from 100v-240v which charges 2 pieces of 6F22 9v li-on/ Ni-MH/ Ni-Cd batteries at a time in parallel. Charging status is identified by the Red color LED indicators. Downside is, the circuit will not withstand sudden spikes and will be noisy for sure.



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World’s Lightest Laptop from SONY- VAIO X

Posted by jimstech on November 23, 2009

VAIO X Series – VPCX117LG/B

11.1 (28.2 cm) VAIO X (Black)

Superior VAIO craftsmanship has created an extremely light, extremely thin mobile PC with long battery life. It boasts a 128 GB SSD that is fast and resistant to shocks. Its impressive slim design is durable and weighs only 760 g.

• Intel® Atom™ Processor Z550 (2 GHz, HT Technology supported)
• Genuine Windows® 7 Professional (32-bit)
• 11.1 (28.2 cm) wide (WXGA: 1366 x 768) ; VAIO Display Premium, LED backlight
• All for extremely thin and light
• Extremely long Battery life
• Integrated Wireless LAN IEEE 802.11b/g/Draft n


Operating System

Genuine Windows® 7 Professional 32-bit (English Version)
Hong Kong Chinese, Simplified Chinese, Arabic, Thai



Processor Name Intel® Atom™ Processor Z550*1 (2 GHz, HT Technology supported*2)
Chipset Intel® System Controller Hub US15W Chipset
Processor System Bus 533 MHz
Memory Bus 533 MHz
Cache Memory 512 KB

Main Memory

Pre-installed/Max 2 GB DDR2 SDRAM (on board*3)

Flash Memory

Flash Memory 128 GB*4 (Serial ATA)


Graphics Accelerator Intel® Graphics Media Accelerator 500


Type 11.1 (28.2 cm) wide (WXGA: 1366 x 768) TFT colour display (VAIO Display Premium, LED backlight)


USB High Speed USB 2.0 x 2
Network (RJ-45)Connector 10Base-T/100Base-TX / 1000Base-T x 1
Display Output Connector Analogue RGB, mini D-sub 15 pin x 1
Headphone Stereo mini jack x 1
Memory Stick Slot Memory Stick Duo (PRO-HG compatible, MagicGate function)*5
SD Memory Card Slot SD Memory Card (SDHC compatible, Copyright protection function (CPRM) )
DC IN x 1

Wireless Connection

Wireless LAN Type*6 Integrated Wireless LAN IEEE 802.11b/g/Draft n*7
Wireless LAN Data Rate maximum 11Mbps (802.11b)/54 Mbps (802.11g)/150 Mbps (Draft 802.11n)*8
Wireless LAN Frequency 2.4 GHz (802.11b/g/Draft n)
Bluetooth Bluetooth standard Ver. 2.1+EDR


Front Side Camera Effective pixels: 640x 480


Sound Chip Intel® High Definition Audio compatible
Speaker Built-in monaural speakers
Microphone Built-in monaural microphone

Keyboard/Input Device

Keyboard Approx. 17 mm key pitch/1.2 mm keystroke , 82keys
Touchpad Intelligent Touchpad

Battery Life

Bundled Battery VGP-BPL19 Lithium-ion battery: up to 6.5 hours of use
Optional Long Battery VGP-BPX19 Lithium-ion battery: up to 14 hours of use


Dimensions (WxHxD) 278 x 13.9 x 185 mm
Weight 760 g (including the supplied battery)

Included Software

AV Entertainment Windows® Media Center
DVD Creation Click to Disc
Still Image/Photo PMB (Picture Motion Browser)
Word Processor / Spreadsheet 60-Day Trial Version of Microsoft® Office Professional 2007*10
Tool Roxio Easy Media Creator, Adobe® Reader® 9, McAfee PC SecurityCenter 30-day Free Trial*11, Norton™ Online Backup 60-day Free Trial*12
Utilities VAIO Control Center
Support VAIO Recovery Center, VAIO Update, VAIO Transfer Support ,VAIO Data Restore Tool

Supplied Accessories

AC Adaptor AC Adaptor (VGP-AC10V5)
Battery Lithium-ion battery (VGP-BPL19)*13
Others Windows® XP Professional Install Disc , Cleaning cloth

Price: MRP Rs. 84,990 /-*

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