That depends whether you want to use SLAs (Sealed Lead Acid batteries), like I use ... or Lithium batteries.
Irrespective, to make a useful PS you will have to:
* put the batteries in a case
* provide an on-off switch - and a charging switch/socket
* and an umbilical to the preamp (with appropriate plugs & panel sockets).
The preamp which I make uses:
* 2x 12v SLAs, stacked to give a 24v DC rail
* with a parallel stack to lower the Zout.
Irrespective, to make a useful PS you will have to:
* put the batteries in a case
* provide an on-off switch - and a charging switch/socket
* and an umbilical to the preamp (with appropriate plugs & panel sockets).
The preamp which I make uses:
* 2x 12v SLAs, stacked to give a 24v DC rail
* with a parallel stack to lower the Zout.
Handy thing abt batteries is that it's easy to get a split rail supply - eg +12V, 0V and -12V
For my phono stage I use discarded 500mAh lithiums from throwaway vape sticks . They are still re-chargeable but as with any Lion cell, much care must be taken when charging them. A capacitor accross each side or single pack woulldn't go amiss.
For my phono stage I use discarded 500mAh lithiums from throwaway vape sticks . They are still re-chargeable but as with any Lion cell, much care must be taken when charging them. A capacitor accross each side or single pack woulldn't go amiss.
OK, so don't bother with the centre-tap, just 6 Lion in series. I'm guessing you're not too familiar with electronics, remember whatever you do, you'll need to factor in an ability to charge the cells safely.
Failing that, get enough battery holders to hold, say, 16 AA cells in series. A pre-amp shouldn't take much current - Max ~50 mA I'd guess, but you could check it. AA batteries are abt 3 Ah from memory, so divide the the current into that capacity. 3Ah divided by .05A will give you 60 hours per set.
Failing that, get enough battery holders to hold, say, 16 AA cells in series. A pre-amp shouldn't take much current - Max ~50 mA I'd guess, but you could check it. AA batteries are abt 3 Ah from memory, so divide the the current into that capacity. 3Ah divided by .05A will give you 60 hours per set.
Then you simply need 2x 12v SLAs, stacked (to give 24v). Preferably, have 2 stacks in parallel, to reduce the Zout.
Note that - unlike L-ion batteries - SLAs won't ever ignite when charging. 😵
Maybe not, but I would not count on it.I've used UPS for computers for almost 15 years. I've had as many as 4 at once, so quite a few batteries over the years. Twice, when they failed, it could have been a fire. They got very hot, very. To the level that I took the entire UPS outside and gingerly removed the deformed batteries. In both cases they did not leak, but whoa, it made me much more careful. These were in APC smartups units. Also if I remember right the battery usually puts a max charge amperage on the battery label.
How very interesting ... and disturbing! 😵
Sure - so you need to buy an appropriate 'smart' SLA charger. I also always use a 10 ohm / 1 watt resistor in series with the charger to limit the incoming current to the SLAs.
This is similar to the Daytons from Parts Express but 24v instead of 21v. I've used the Daytons and think they're decent. Most of the complaints about them are from people that don't really understand how complicated it is to manage batteries. For a low power application they're pretty good. As always you need high-quality, authentic cells from Samsung, Sony, etc. Because the cells are balanced via bleed resistors you need to remove the cells if the pack goes uncharged for several days, lest the cells drain below minimum voltage.
https://www.ebay.com/itm/186135124888
https://www.ebay.com/itm/186135124888