Showing posts with label Ni. Show all posts
Showing posts with label Ni. Show all posts
Saturday, October 25, 2014
Zapper Refurbisher Ni Cad Battery Circuit Diagram
Zapper Refurbisher Ni-Cad Battery Circuit Diagram. Batteries and Nickel Cadmium, or simply Ni-Cad NiCad NiCd or sometimes do not work as expected, has no voltage or current, can not be recharged, it means that the battery is internally shorted or partially damaged. You can retrieve this battery in many ways, either by chemical or electrical recovery. One is simpler and recondition the Ni-Cad battery using a zapper circuit.
This circuit restores the Ni-Cad battery short circuit, forcing a high current flow to burn the dirt inside. The resistance of 120 ohm per 10W is used to limit the load current of the capacitor. After zapping the battery goes to the load position, the charging process will take a long time and is indicated by the LED, which will gradually increase the brightness intensity until stable, so when the battery is fully charged.
The power supply for the circuit can be made from a small transformer 350 mA to 1 A with a half-wave rectifier or full wave.
This circuit restores the Ni-Cad battery short circuit, forcing a high current flow to burn the dirt inside. The resistance of 120 ohm per 10W is used to limit the load current of the capacitor. After zapping the battery goes to the load position, the charging process will take a long time and is indicated by the LED, which will gradually increase the brightness intensity until stable, so when the battery is fully charged.
The power supply for the circuit can be made from a small transformer 350 mA to 1 A with a half-wave rectifier or full wave.
Zapper Refurbishes Ni-Cad Battery Circuit Diagram
Thursday, September 25, 2014
Simplest Automatic Ni Cd Battery Charger Circuit Using IC 555
The 555 timer can conveniently function as the heart of an automatic Ni-Cd battery charger, the circuit is intended to maintain a full charge on a standby battery supply for an instrument that is always connected to the mains, whether in use or not. lt can also be used for the charger unit for pocket calculators, etc.
The circuit uses the timer’s two on-chip comparators, the flip flop and driver amplifier. A zener provides a reference voltage somewhere near the battery voltage with an allowance for adjustment.
The two potential divider networks supply the comparators with adjustable voltages, one for LOW (switch on) and the other for HlGH (switch off). When on, the output gives a maximum of 10V and when off gives GV, the maximum current is 150mA which is limited by the ·47 ohms and protected by the diode. The circuit is calibrated by substituting a variable voltage supply for the Ni-Cd batteries., The HIGH adjustment is set first so that the output switches off at the maximum battery voltage and then the LOW is set for minimum battery voltage. It is simplest to leave the output disconnected from the resistor until after the setting up procedure.
The circuit uses the timer’s two on-chip comparators, the flip flop and driver amplifier. A zener provides a reference voltage somewhere near the battery voltage with an allowance for adjustment.
The two potential divider networks supply the comparators with adjustable voltages, one for LOW (switch on) and the other for HlGH (switch off). When on, the output gives a maximum of 10V and when off gives GV, the maximum current is 150mA which is limited by the ·47 ohms and protected by the diode. The circuit is calibrated by substituting a variable voltage supply for the Ni-Cd batteries., The HIGH adjustment is set first so that the output switches off at the maximum battery voltage and then the LOW is set for minimum battery voltage. It is simplest to leave the output disconnected from the resistor until after the setting up procedure.
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