Hi all,
my first post in the forum.
I am have some electronics experience in microcontroller based projects, for home automation and AC motor control.
For a change I am now looking to build a guitar amplifier just for the fun of it, and I am having problems figuring out how to build the split power supply.
I want the amplifier to be portable so it needs to be battery powered. Researching the subject I found that a common way to go is to power it would be to power a mains inverter
with a 12V battery and then feed the 220V AC to a standard split power supply.
It seems to me quite a convoluted andheavy way to go, so I started exploring ways to use a battery instead.
One simple way would be to connect two batteries in series and use the middle terminal as ground.
Since I would like to have a +/-30 V, 3A supply that would make it quite a heavy solution.
Instead I would like to find a way to use a single 36V battery from a disused electric bike, to feed a DC converter to obtain both the positive and negative voltages.
I found a video
which explains how to use a pair of cheap LM2596-based buck converter boards
https://www.aliexpress.com/item/1775868763.html?_randl_currency=GBP&_randl_shipto=GB&src=google&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=17858129175&albag=&trgt=&crea=en1775868763&netw=x&device=c&albpg=&albpd=en1775868763&gclid=Cj0KCQjw1bqZBhDXARIsANTjCPLXrgUE0LYsPUFdY_YrmfSV0Xj1iU_wHESnRS_fZhrTy01sY3UBfywaAnIpEALw_wcB&gclsrc=aw.ds&aff_fcid=c54da1cb57f1457ab9b76bc03c2550ce-1664040760183-01841-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=c54da1cb57f1457ab9b76bc03c2550ce-1664040760183-01841-UneMJZVf&terminal_id=0be153833cec4022b7927a1df14d8c94&afSmartRedirect=yto get the positive and negative rails. One of the LM2596 would take care of the positive voltage, and the other would regulate the negtive. I have them on order andI will be experimenting with them.
However, their specs are not ultimately suitable for my project, since they can't reach neither -30V nor the desired current output.
I have a few questions:
1) Is the method above (two sparate buck converters) a good one or there are better ways to solve the problem?
2) If the method is good, is it feasible to achieve +/-30V, 3A supply?
3) Any recommendations for switchers with more muscle than the LM2596?
Thanks in advance
Riccardo