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Nicad battery charger , this circuit just use transformer not  CT and  3 LEDs lamp. And its very very simple circuit charger . This circuit constant current LEDs to adjust charging current. It uses LEDs that pass a constant  current about 15 mA for an applied voltage range of 2 to 18 Volt. They can be paralleled to give any multiple of 15 mA and they light up when current is flowing. The circuit will charge single cell at 15 , 30 , or 45 mA , or cells in series up to the rated supply voltage limit about 14 Volt. See schematic below : Click to view larger

Nicad battery charger , this circuit just use transformer not  CT and  3 LEDs lamp. And its very very simple circuit charger . This circuit constant current LEDs to adjust charging current. It uses LEDs that pass a constant  current about 15 mA for an applied voltage range of 2 to 18 Volt. They can be paralleled to give any multiple of 15 mA and they light up when current is flowing. The circuit will charge single cell at 15 , 30 , or 45 mA , or cells in series up to the rated supply voltage limit about 14 Volt. See schematic below : Click to view larger

This is the simple Nicad Battery Tester Circuit Diagram.This battery tester produces Nicad battery test at a speed of 500 mA. When an endpoint 1 V (defined by the setting of R3) is resolved, pin 2 of U2 becomes low, deactivating Ql and disconnecting the test battery from the circuit. Power for U3 comes from the 12-V regulator in series with the battery being tested.   Nicad Battery Tester Circuit Diagram A clock or timer can be plugged into SI to indicate the time it takes to discharge the battery under test.

Battery Charger > In this my circuit , which is one of a series of simple battery charger , but this circuit to charger the Nicad battery . This circuit included with current and voltage limting . Why use it ?? because with current voltage you can choose voltage to charge a battery , and the limiting voltage use limit voltage if the battery is fully, because if battery fully that damaged quickly. See this schematic below : Click to view Enlarge Lamp 1 will glow brightly and the LED will be out when the battery is low or run out and the circuit is processing being to charged , but the LED will bright and the light dim when the battery is almost ready. Output voltage between 12 to 14 volt with current 100 mA.