How can I portably power my old slide projector on the go? [more inside]
I'm trying to resurrect an old Casio CPS-85 88 key keyboard. When it was given to me, the power jack was cracked, so I desoldered it and soldered on a new one. No luck; I can't get power (even with a different power supply). So I'm stuck running off of a lot of D batteries. As using D cells is both wasteful and expensive.is there any way for me to rig an external power supply to the battery terminals in a safe manner?
If I use a 19.5 volt 4.7 ampere adaptor with a device that calls for a 19.5 volt 3 ampere adaptor, will it cause any problems?
Like most mefites, I have far too many gadgets, and the wall warts to match. I suspect most of them could be replaced with a single USB charger - is this something that already exists? [more inside]
I have an old record turntable (in excellent shape) that I would like to use, but I'm stumped regarding to power it. [more inside]
What DC to AC power inverter can I buy for use in a car that won't contribute hum to an audio signal from devices it powers? [more inside]
TransformerFilter: I've just relocated to the US and have a rechargeable drill that uses a 17V DC transformer. I need to replace the transformer, since the one I have runs on 240V power (and has the UK prongs). The problem here is that I can't find a suitable replacement at the likely suspect places: hardware stores, Radio Shack...
I know that the voltage must match precisely and that the amperage must be at least as high as the noted amperage, and that the polarity must also match. So where can I go to find a good transformer? I'm in NYC, but I prefer to shop online.