2 volt power supply for AIWA walkman Because the original 2V power supply is pretty rare and there are no power supplies on the market that can deliver 2 volts, i wanted to make an easy to to build one, wich (nearly) everyone can recreate. So i used parts that you can buy on Amazon or Ebay. Parts: An USB cable, one side USB, the other side a 3,5/1,35mm plug that fits into the AIWA. A LM317 module, that converts 5V to 2V(2.4). Everyone has a computer or an USB PS, so this should not be a problem Unfortunately, i couldn´t find a SMD LM317 module, so the modul is pretty big, i made mine a bit shorter by desoldering the LM and putting it sideways. But this is not a necessary step, i just did it to reduce the height a little bit. The LM317 is adjusted to ~2.4 Volts, like the original PS. Its not 2 volts (like its printed on) because of the used battery, you can´t charge a PB-battery with 2 V, it will never charge completely! My housing is made of wood and brass. The AIWA Logo is an outside carve filled with epoxy and violet pigments. A simple plastic box will do the same IMPORTANT: IF YOU USE METAL, YOU HAVE TO ISOLATE THE BOARD AND THE HEATSINK!!! THE POLARITY OF THE AIWAS IS REVERSED!! OUTSIDE OF THE PLUG IS +(PLUS), INSIDE IS -(MINUS) In my case it was red wire(more pink) on GND, white wire on VOUT.
I sure Mouser or Digi ket sells SMD voltage regulators . I could design a circuit very easy and have the PCB made if there was a market for them. Sincerely Richard P.S. Nice job on your case !
Its not a problem to get the parts in SMD size, solder this few parts to a perf board is also possible. But i wanted something that you can build just with a screwdriver and a knife..... But anyway, the acceptance and interest for my selfmade stuff in this forum seems to be very low, so i will stop posting it here...
It depends on what you define as low. For instance, if things would have a USB connection on one end, it would be more interesting to me. I have several of these adapters from different brands, and they are stored in a box. It is a pain to get them out every time, so I prefer to work with a USB power supply that can drives these.
Sorry, i don´t know what you mean. One side is a USB Plug, the other side is the plug for the AIWA. So its just a USB cable with a little box between both ends. You only need a Standart USB power supply or your computer to use it...
Hello Emmpunkt, " But anyway, the acceptance and interest for my selfmade stuff in this forum seems to be very low, so i will stop posting it here.." Sorry if I said something because your project turned out very nicely and I love the cool design case . Sincerely Richard
I don´t know why you feel offended!? You are someone who wrote something in this thread. Documenting my stuff, so others have a benefit of it, making Photos and writing a bit of text in a language that is not my native language is a bit of work. If its just ignored (except of 3 or 4 people), i will not do it anymore. And writing in a foreign language carrys the danger of misunderstanding....
Emmpunkt, I look forward to seeing future posts of yours I am currently restoring a Pam brand antique advertising clock /sign for someone . Sincerely Richard
The Intention to make it this style was that you can build it with standart parts, a screwdriver and a multimeter. Just for me, i would use a perfboard and solder a few SMD parts to it. Wich makes it much smaller. After testing it for a few days: Still works without problems, with an emty battery it is getting warm, but not really hot. Measured with a USB Tester, i can measure up to 500 mA (for a minute, than it drops) with an emty battery, wich might be quite high. I did choose a linear regulator because i don´t want high frequency devices nearby or in audio equipment (like a step down regulator) Does someone know if a linear regulator acts like a step down? If it would be a step down, this would mean that the battery current is doubled with half of the voltage. (In: 5V 500 mA Out: 2,4V 1000 mA)? Or is the current just the same? I did not measure the output current, thats why i ask....
