Parkside(Lidl) 20V Li-on dual rail op amp supply

[Tubetec]

I found the Lidl 20v battery charger has dual independant SMPS units of [email protected] and 5v output .
It can be seen in the video here ,

Each circuit is independant from the mains up and has a three section filter ,
might easily be connected as +/- supply for opamp based gear ,

Its not your usual space confined SMPS , these have good heatsinks on the Fets and the rectifier , the casing has many louvered vents to allow everything to breathe ,
the quality of both the charger pcb and the internal battery BMS system in the parkside is first class , they even have conformal coating to keep the dust and dirt out ,
re-purposing the SMPS is one thing , an off grid op-amp supply from a pair of quick change 20V lithium ion tool batteries would be nice , regulated down to 18 or 16 volts .

The charger enclosure itself can double job as back up dual rail supply with batteries in-situ , a suitable power connector , a switch and a pair of regulators are all thats needed .

This thing is substantial , its about 1kg , then add the batteries , it all adds up to an almost off the shelf solution , cell packs come in 2,4 or 8Ah, easily enough to power racks of gear all day long .

 

[Bo Deadly]

Yeah, if you need to power 1000 op amps, that's one way to do it.

 

[Tubetec]

I did say racks ,not an entire console , eirher way your mic pre rack will benefit from a non mains supply and contaminated ground

 

[Tubetec]

MMC command could ensure the unit is always on battery power when in record mode and in auto charge as soon as tape stops rolling

 

[Tubetec]

Im looking out for a small midi controler pcb to relay control the mains input when in record mode via MMC .

I found these programable battery controlers , they monitor the charge and discharge and can be set to cut out at preset voltages , the cells themeselves and the charger take care of the charge cycle automatically , so I really only need this to prevent a low discharge voltage occuring .
https://www.ebay.co.uk/itm/155140015162

 

[Tubetec]

https://www.fruugo.ie/18650-lithium...scharge-protection-6-40v/p-73471512-147609268I found this unit , integrated volt meter and charge/discharge protection all in one intended for use with Lithium ion cells .
A pair of these should mount up neatly enough inside the charger enclosure .
The detect unit I mentioned in the previous post isnt compatible with Li cells .

Theres a couple of options for midi/relay control of the mains supply but Im very interested to hear from some of the synth guys of possible off the shelf pcbs that will do what I need .

I have a block diagram of what I want ,just need to tidy it up a bit now , will post a scan later .

 

[Tubetec]

Thats the rough idea below ,

I might end up using a 7 pin trailer connector and heavy mains four core cable as umbilical to the rack .
Just looking at what I did below again theres an error , I'll leave for now it to see if anyone can spot it .