Once set, the output voltage on the red wire should not vary. To set the LM338 Output voltage: With volt meter on red and black and input to yellow, adjust theĥK trimmer to 1 + 1/6 battery voltage. Can also jumper to the input voltage when testing the Green normally to the battery with the red wire. Regulator voltage output can also be read before connecting to battery
#5252f solar light series
A current resistor should also be in series to common. Only one common connection should be required.īlue to the indicator LED + anode(long leg). Add a diode when necessary.īlack to common which should be black in most tools. Yellow to charging input AFTER the diode in the tool if the charger is AC. Here is the above circuit I made to control the charging of a 12 volt hand vacuum: Increase the 2M resistor to reduce the voltage spread between shutoff and back on.Ī cheaper BC547 transistor can be substituted for the 2N2222 Z1 should be a Zener diode rated at about half of the battery voltage. P2 can be any value up to 250K to reduce battery drain. Output should be set for battery + 1/6 volts. P1 can be 2K for voltages from 6 to 10 volts, 5K for up to 28 volts. This circuit can also be used to charge other voltage batteries: This also keeps the op amp from oscillating on and off! The LED should stay on until the battery voltage drops about 1/2 volt due to the 2M and 47K When the battery voltage approaches 13 volts, set P2 so that the LED comes on then turn the pot the Once the regulator is set, connect the battery through a male cigarette type adapter plug or battery clamps. Pull the output voltage down when it is connected to the cathode of the output diode. An LED and resistor can be used as the load. The regulator output where the battery will be.
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#5252f solar light full
Use a power supply or the solar cell input voltage greater than 16 volts in full sun with a load on Two 470 ohm in parallel for 235 ohm and two 4.7K in parallel for 2.3K on the regulator adjust to get 13.6 volts.Īdjust P1 to Set the regulator voltage on the output diode cathode to 14 volts without connecting it to I tested this circuit in my car for a week and the battery voltage never got high enough to cause any damage: Keeps the battery from being drained when the transistor shuts the regulator off. The Shottkey diodes on both sides of the regulator protect it from reverse currents and the one on the output
#5252f solar light Pc
Locate the voltage regulator on a PC board near an outside edge so that a heat sink can be easily added. The voltage regulator may need a heat sink if it gets too hot to touch and could melt a breadboard! The regulator should deliver the same current, but limit the voltage supplied to the battery Normally voltages will go up and down with This circuit is similar to the tool charger circuit except that the op amp is driven by the battery asĪ solar panel cannot be counted on to supply a steady voltage. When the battery voltage reaches a fully charged voltage set by P2, the Op Amp turns off the voltage Circuit monitors a battery being charged using a LM317T or LM338T TO 220 type voltage regulator:Ī cheaper BC547 transistor can be substituted for the 2N2222 which cuts off charging voltage