Non-standard memory for a digital camera. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Non-standard memory for a digital camera. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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When the owner of a SHAR PIXELS SH-V3HD digital video camera turned to me with a request to help in purchasing a charger (the complete one was lost during the trip), I agreed without hesitation. However, it turned out that it is almost impossible to buy a memory for this camera not only on the territory of Ukraine, but also abroad...

Non-standard memory for a digital camera
Fig. 1

This camera is powered by a built-in 3,6 V lithium-ion battery with a capacity of 1000 mAh. To connect the memory, the camera has a minUSB socket located on the front of its body. The owner of the camera remembered that the lost memory was marked "5 V / 1 A". Based on this information, a similar charger "TRAVEL CHARDER part NO: TC-300-X5" was purchased, the output parameters of which corresponded to the required ones. True, unlike the lost memory, instead of a cable ending in a miniUSB plug, it has a USB socket. Therefore, to connect the new charger to the miniUSB socket of the camera, we tried the standard adapter cable "USB-miniUSB" supplied with the camera (Fig. 1). However, despite the fact that both the charger and the cable were previously checked, the camera battery was not charging - its indicator LED was not lit.

Unfortunately, the search for information on the Internet was not successful - it was not possible to find the electrical circuits of the camera and its memory. But, as they say, chance helped. When I got acquainted with the charger "Switching Adapter, MODEL: DSA-6E-05EU, 5V, 1 A" of a similar AIPTEK video camera, it turned out that its nameplate contains information that the common wire (GND) enters the camera through pin 5 of the connector miniUSB, and +5 V - through its pin 4. It became clear why when the charger was connected using a standard adapter cable (Fig. 1), charging did not occur - pin 4 is not involved in its miniUSB plug.

Non-standard memory for a digital camera
Fig. 2

When disassembling the purchased miniUSB plug, it turned out that there is pin 4 in it, but unlike the others, it does not have a lead for soldering the wire (Fig. 2). As it turned out later, in the standard use of the five-pin miniUSB connector, this pin is not used, so manufacturers, in order to save metal, install a shortened one instead of a "full" one.

I did not have to think long about the problem of the fourth contact of the miniUSB plug. Since the cable for connecting the charger with the "AIPTEK" camera is two-wire, this prompted the idea to replace the shortened pin 4 in the purchased miniUSB plug (which will end the connecting cable) with any of the pins 1-3. The easiest way is to use pin 2, since it, like pin 4, is located at the top of the plug contact group.

So, we disassemble the miniUSB connector plug and remove the contact group. Then, in its plastic fill, along the boundaries of contacts 2 and 4, we make cuts with a narrow edge of a flat file until it touches the contacts. Now they are easy to remove by pulling with tweezers. Having removed the short contact 4, carefully insert the former contact 2 into its seat with tweezers. Next, solder the wires of the two-wire cable to the contact 5 and the new contact 4, install the plastic insert with the modified contact group into the metal part of the miniUSB plug and, having connected its halves, put them on plastic clip from the plug kit.

Non-standard memory for a digital camera
Fig. 3

It is advisable to solder the free ends of the cable directly to the mounting points on the memory board of its USB socket (firstly, it is easier, and secondly, the exclusion of an extra plug connection increases reliability). To do this, in the cover of the memory housing, next to the existing cutout for the USB socket, a hole is drilled along the diameter of the cable. After passing it through this hole, solder the wire coming from pin 4 of the miniUSB plug to pin 1 (+5 V) of the USB socket, and coming from pin 5 of the miniUSB to pin 4 (GND). Finally, the cable is fixed in the cover, for example, with Moment glue and put it in place. The appearance of the modified memory "TRAVEL CHARDER part NO: TC-300-X5" is shown in fig. 3.

Author: E. Yakovlev

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