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01-28-2018, 02:13 AM
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#1
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,047
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Help with a 5 volt power issue?
Looks like this circuit will do fine on 5 volts, which means I can use a regular USB powerbank phone charger thing. However it gets goofy if the voltage drops at all temporarily. Where can i put a capacitor in this to help keep that from making trouble? Can someone finish this schematic?
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01-28-2018, 02:52 AM
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#2
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,047
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Or if theres some sort of rechargable battery with decent storage above 5 volts? A regular 9v has too little storage and 6 rechangable a's would be a PITA
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01-28-2018, 08:24 AM
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#3
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Human being with feelings
Join Date: May 2009
Posts: 29,260
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Directly across +/- rails of the 5V output of the regulator starting somewhere between 100 and 220 uf. Probably easier to just get a regulated 5V PSU though unless you are into to building regulated PSUs. Just saw the "finish this schematic" part... which regulator chip are you using or do we need to hunt that down? LM317 will probably do it...
I've built various versions of that one a few times. Adjustable is better IMHO as you can dial it in precisely. In above R1 is the voltage adjustment. There are some others where it spits out the advertised value as-is FWIW. You need more than 5V going in so it can actually regulate so 9V in is likely a good trade off for regulation wiggle room and heat.
__________________
Music is what feelings sound like.
Last edited by karbomusic; 01-28-2018 at 08:34 AM.
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01-28-2018, 10:40 AM
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#5
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Human being with feelings
Join Date: May 2009
Posts: 29,260
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Are you trying to get out of using a wall wart? I'm not getting what that project and wanting to stabilize a regulator that should already be stable have in common. I'm sure I'm just overlooking something.
__________________
Music is what feelings sound like.
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01-28-2018, 11:13 AM
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#6
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,047
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I want to make this thing completely wireless. The wireless MIDI part is handled, but the powering of it is vexxing me
Is seems like it *should* run fine on 5 volts like a regular cellphone USB powerbank, but apparently the CC's are making trouble
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01-28-2018, 11:30 AM
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#7
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Human being with feelings
Join Date: May 2009
Posts: 29,260
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Yea but if the regulator spits out 5V then it must take in more than 5V or it can't actually 'regulate' 5V. Regulation must have something above the desired output for that wiggle room I mentioned. If you are trying to use 5V in front of the regulator, you are breaking it's ability to regulate - it will be able to account for an overvoltage but there is no extra there to make up for an undervoltage. Surely the stock PSU is larger than 5V for that reason?
You could try the cap I suggested across the +/- rail, it may help or it may not, serving as a temporary reservoir if the incoming drops for a split second.
__________________
Music is what feelings sound like.
Last edited by karbomusic; 01-28-2018 at 11:35 AM.
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01-28-2018, 11:48 AM
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#9
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Human being with feelings
Join Date: May 2009
Posts: 29,260
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^Yep, that's in one of pipe's links. That would work as it's just replacing the regulator with the regulator at the other end of the USB cable.
__________________
Music is what feelings sound like.
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01-28-2018, 11:58 AM
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#10
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,047
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I just ordered one of these, I found some cheaper power banks, but I really love the other things Joyo is doing so I opted to support development Hopefully this works ok, if not, I have a cool 9v supply anyway.
http://joyoaudio.com/en/product/show_155.html
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01-29-2018, 01:21 AM
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#11
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Human being with feelings
Join Date: Aug 2007
Location: Near Cambridge UK and Near Questembert, France
Posts: 22,754
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Can be recharged 1,000 times.... so that makes it er almost two shows/sessions per week for...ten years? OK I`ll buy that so long as the price is acceptable. Good solution.
__________________
Ici on parles Franglais
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01-29-2018, 10:27 AM
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#12
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,047
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Pedaltrain and mission engineering make some too, as do others
the crazy thing is, I had asked several shops about something to do this and they all said they had no idea. After I asked you guys about these solutions, I was looking around on more forums about unrelated stuff and ran into someone talking about the joyo. SO when I look at that, I realize, there is an entire market category devoted to this problem, lots of products.
And the kicker: EVERY single shop I had originally asked sells these products....you just can't win
SO Mission Engineering has two versions,
https://missionengineering.com/shop-...v=7516fd43adaa
one with and one without a battery. The one without justr lets you plug in a USB supply and I think its called a step up converter, so I looked for that as well.
I found this https://www.amazon.com/EX-Voltage-Co.../dp/B072WL63GL
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