Battery Chargers:
Simple chargr:
Simple chrgr with 1 transistor:
With the help of a precise variable voltage supply, the upper and lower voltage levels were set. The normally connected (NC) lead of the relay isn't joined to the 15-V dc supply, which blocks this voltage from passing to the battery leads. This will accurately set the upper and lower levels. But the charging supply of 15 V dc was connected to the circuit.
chrgr 1:
http://www.aaroncake.net/circuits/index.html
This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.
chrgr 2:
This charger will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge. If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged.
chrgr 3:
Except for use as a normal Battery Charger, this circuit is perfect to constant-charge' a 12-Volt Lead-Acid Battery, like the one in your flight box, and keep it in optimum charged condition.
Simple Lion chrgr:
This is a Lithium-ion charger for lipo batteries. Circuit schematic shows configuration for charging single 3.7V lipo battery but voltage can be set to charge several batteries in series. Lipo charger sets a current limit with the LM317, and 1 resistor, and the voltage limit with the TL431, and 2 resistors. 1K resistor is needed to let the TL431 decrease the LM317 current, and to provide the necessary current to the TL431. The optional Schottky diode at the output will prevent current flowing back from battery to the charger circuit when power is disconnected, and reverse biasing of the LM317. Power supply with more than 3V above output voltage is required.
Dual batt lion chrgr:
This circuit was build to charge a couple series Lithium Cells (3.6 volts each, 1 Amp Hour capasity) installed in a portable transistor radio.
mini inverter:
Mini inverter 2:
Inverter 3:
Inverter 4:
author: Ashad Mustufa
Using this circuit you can convert the 12Vdc in to the 220VAc. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer.
How to calculate transformer rating.
The basic formula is P=VI and between input output of the transformer we have Power input = Power output For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*. So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A.
Light sensor:
TL inverter:
http://www.aaroncake.net/circuits/index.htm
Parts
C1 100uf 25V Electrolytic C2,C3 0.01uf 25V Ceramic Disc C4 0.01uf 1KV Ceramic Disc
R1 1K 1/4W R2 2.7K 1/4W Q1 IRF510/540 MOSFET U1 TLC555 Timer IC
T1 16V 300mA Transformer LAMP 14W Fluorescent Lamp MISC Board, Wire, Heatsink For Q1
