fechter wrote:I'm reviewing the design of the mini limiter board now.
It looks like by adding 2 resistors and a transistor, I can make an interface for CellLogs or HVC boards that will drop the charge current to zero when active. These parts can be left off the board for those who don't need this function.
Does this sound like a useful feature?
Another thing I'd like to test is to replace the output diode with a red LED and see if it is bright enough to see. This would provide the diode function needed in addition to indicating when the limiter was active. My guess is the LED would light up during bulk charge getting gradually dimmer as the pack approaches the CV point, then go out. This would give a visual indication of when the pack was done.
fechter wrote:Using the HVC to pull up the positive amp input will work fine other than we can't use a direct connection to a CellLog. ... This should work fine for any optocoupled HVC board like Methods' or Gary's.
cor wrote:If you connect pin 5 (+ input of 2nd Opamp) to the OVP point (which is always 2.5V) then you do not need to split the 160k resistor in two, saving one more resistor.
fechter wrote:... It's bad practice to reverse bias the LEDs though, I'll have to check the reverse voltage rating.
fechter wrote:... and programming the CellLog alarm to be normally closed instead of normally open.
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