FAQs.md

Warning: OBSOLETE VERSION - If you don't plan to use the original DMG front PCB with the original screen I suggest to produce the DMG V2. Link here

FAQs

What IPS boards are compatible with the VIS front IPS PCB?

My front PCB can be used to replace the following IPS board used in the v4 and v5 OSD IPS.

What speaker can be used?

You can use the original Gameboy speaker or 1 Watt 8 Ohm speaker (23 mm diameter) like the following one (it must have + and - soldering points)

Can the gain of the speaker be controlled?

Yes, on the audio board, I use R2=R4=10 kΩ for the original speaker and R2=R4=30 kΩ for the 1W speaker. Hence, by increasing the value of R2 and R4, audio power increases; otherwise, it decreases.

How much power does the power board provide?

DC voltage or battery voltage is firstly regulated to 5V with 1A, and then, this 5v line is filtered with an ultra-low noise LDO (U4 on the power board) that provides in output a 5V line with 300 mA. This power is sufficient for all the features, but if you need a more powerful LDO, you can use, for example, the REG113NA-5/250 LDO that provides 400 mA. Clearly, this LDO is used only to achieve a filtered 5V line on the mainboard (unregulated negative voltage for the original LCD is produced after the first regulation to 5V at 1A), and these lines are totally independent from the battery charger.

Has the Lipo power board all the protections?

I put all the know protections for the battery so it won't overcharge, discharge, or have a short circuit. To do this, I used well know schematics and chip combinations to develop the Lipo board.

What is the Lipo Battery to use?

I suggest any 3.7V 125054 Lipo battery with a ph2.0 connector installed, as shown in the following image.

Has mainboard protection?

Yes, there are resettable fuses in series to the battery, the DC line, and the unregulated voltage for the original LCD. In addition, also the boost converter and the LDO limit the current on the various lines.