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Excellent, lets see something like this available in the store section. The circuit that relies on a MOSFET is an extremely simple solution to the problem of disconnecting batteries when external power is available. Building something with more logic WOULD be a better solution.

If you are using bare cells then a protection board is mandatory. If your battery is a prebuilt pack from a reputable manufacturer then they already built one in. The Tenergy battery I tested has one under the plastic casing on the side the wires come out.

My theory is that nobody bothered to look beyond a certain diagram that has existed in this community for years. That's as much as I'm willing to say to keep this from turning out like the last thread.

Lithium batteries or Li-Ion/Li-Po batteries are the clear choice for building a portable because other battery chemistries don't have the same energy density. The only caveat with lithium batteries is they CAN and WILL spontaneously combust if you miss use them. In this thread I intend to...

@link270 My posts are gone from this thread because as SS pointed out they are inappropriate. I'm considering starting a thread in another category but I don't have a lot of time to dedicate to this hobby. The time to make a detailed write up cuts into my modding time which is generally less...

I'd like to point out that in your quote you cut out the part about the superstition being for NiMh cells memory effect on capacity when not fully discharging and recharging. And that I've mentioned many times that Lithium cells can be very dangerous but with a protection board you'd be hard...

I'll see what I can come up with I have a 5 farad car audio capacitor in my salvage bin. On a serious note, I do have caps already in place for the ti 08080 regulators. I will just swap them out for something bigger. Also keep in mind I was rapidly disconnecting and reconnecting to get a freeze.

So it took 6 hours and 40 minutes to charge my 7.4v 5860mah battery pack. So I'd say this red board charges at around 0.9-1.0 amps. The last hour of the charge the amp draw slowly ticked down to 0. So that means this red board is in-fact a smart charger and is capable of safely charging lithium...

I haven't had any problems yet. It sure beats the archaic 2 port play and charge thing. The only thing I've noticed is it does emit coil whine while charging (only while charging). The coil whine sounds like its just below the 15.625kHz frequency your standard CRT TV emits.

Preliminary testing on this red board shows the red board is capable of safely handling play and charge. As you can see from the pictures below the power draw from the 12v 5amp power supply is 9.1 watts when the system is powered off and the batteries are charging from empty (3.0 volts per...

WTF so I decided to try Bomber's Notebook with the OSD up and it works flawless today. I will have to test further. All I can think of is maybe there was still some residual heat in the parts from soldering (I agree my wire lengths are very long). I originally tested literally right after...

Victory. Everything seem good except occasionally (every 1-5 minutes) the screen blacks out for half a second then comes back. This could be on my end and not the UltraVGA's fault. The only real issue I've found is the Bomber's Notebook is still a no go zone. From what I understand the N64...

@marshallh Just to double check my findings. This picture shows 17 pins on a 24 pin FFC spot. With my continuity tester and a 24 pin FFC to DIP this is the pinout I'm getting. NOTE: my order is inverted to the above picture see attached image. Pinout As Per FFC to DIP (Inverted to Ultra64...

I have 3 others floating around my basement. I use them anytime I convince by friends to race me in games on the N64. I'm not a speed runner by any means but my last play through of OOT at 100% was 14:10:03. My friends usually give up 2 hours in when they realized they can't beat my 100% while...

I need one of these for my in-progress portable. Any chance these with be available to buy? I have been considering using a GC replacement board with a GC to N64 adapter if these aren't good to go.

I just finished my new entertainment center. I'm calling it a "portable" because technically you could move this beast fully loaded with 2-4 people but the theoretical battery life would be terrible. Honestly I just wanted to show it off to a community that appreciates playing games on the...

Thanks! Funny thing is I threw this together in a weekend with the only objective to soak up parts. The screen for example is something I bought years ago but never used because it draws too much power for reasonable battery life. I'm much more proud of the smaller one in the comparison picture...

Yeah basically. You don't even have to desolder U13. Just connect 5V to the output leg on it. Its labeled something like VO(+5). The datasheet for that particular regulator shows a 2V dropout voltage. So thats more like a 30% battery life loss.

As for the battery management on THIS portable I used a regular old BMS. You can charge a battery pack by giving the BMS power although this isn't ideal. The function of a BMS is to disconnect the cells if they are overvolted, undervolted, or are shorted out. So when they reach somewhere around...