EE Notes

Motor winding insulation temperature ratings
NEMA classes are A (105C), B (130C), F (155C), H (180C).   Class B is the most prevalent since 1960's.

SLA Battery Charging
Current limited (0.25C) charge to 2.45V/cell then drop to 2.30V/cell.

LiFePO4 Battery Charging
Current limited (0.2C - 0.7C) charge to 3.65V/cell hold till the current drops to 10% of initial charge rate.

Chip Resistors
0402 resistors are most commonly 1/16W.
0603 resistors are most commonly 1/10W.
0805 resistors are most commonly 1/8W.
1206 resistors are most commonly 1/4W.

Tantalum Capacitors
The voltage ratings are usually 50V or below.  Even at 50V, the large value tantalum capacitors are expensive, so Aluminum electrolytic should be considered instead.

Relay
1-Form-A: single pole normally open
1-Form-B: single pole normally closed
1-Form-C: single pole double throw