The thread on the older versions is here: http://endless-sphere.com/forums/viewtopic.php?f=31&t=21768
NOW IN STOCK
Degull wrote:Just to let everyone know in case you were not following the previous thread. Fetcher has entrusted myself with the distribution of the bare boards. I should have them some time early next week and will start shipping as soon as I get them.
The bare boards will cost $10 each. Basic USPS shipping including the cost of a padded envelope pretty much anywhere in North America should be $3-5. I'll get to the post office in the next couple of days and find out exactly how much the shipping will be to different parts of the world. I'll start taking payments as soon as I find out the exact shipping rates. At this point there are only 34 boards for sale so don't think about it for too long.
Email and paypal info email@example.com.
What it does:
Attaches to the output terminals of a power supply, monitors the current and automatically reduces the output voltage when the current tries to exceed an amout dialed in by the adjustment pot on the limiter board. This results in constant current operation when the load exceeds the current setting.
The limiter board has a bi-color LED that will go red when the charging current is at the limit. When the pack reaches the CV setting of the supply, the LED goes out, indicating the pack is nearly full. In addition, there is an input for cell level HVC alarm that will also drop the charging current and light the LED green. HVC alarm can be from CellLogs or most previous HVC boards that monitor individual cell voltages.
The board can be configured for most switching power supplies, not just Meanwells. The basic configuration is rated for up to 20 Amps charging, and there is a provision for an additional shunt that can raise the limit to 40 Amps. The adjustment pot goes from the maximum current to near zero, allowing a wide range of charging current.
The idea is you want to dial down the current on the supply so that the power remains below the supply's rating so nothing overheats or blows up. In some cases, the charge rating of the pack may be the limiting factor, not the supply.
Here is the schematic: