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Build a Best Automatic 12V Lead Acid Battery Charger Circuit Diagram . This Best Automatic 12V Lead Acid Battery Charger Circuit Diagram 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. Sourced By Circuitsstream Best Automatic 12V Lead Acid Battery Charger Circuit Diagram  Commponents Part Total Qty. Description Substitutions R1, R3 2 330 Ohm 1/4W Resistor R2 1 100 Ohm 1/4W Pot R4, R5, R7, R8 4 82 Ohm 2W Resistor R6 1 100 Ohm 1/4W Resistor R9 1 1K 1/4W Resistor C1 1 220uF 25V Electrolytic Capacitor D1 1 P...

Even the best car alarm is useless if you forget to set it upon leaving your car, whence this circuit. The relay has a make and a break contact: the  former is necessary to delay the switching in of the  alarm after you have got out of your car, and the  latter serves to switch on the car alarm proper. Immediately on re-entering your car, you must press the hidden switch, Si. This causes silicon-controlled rectifier Thi to conduct so that the relay is energized. At the same time, the green LED lights to indicate that the alarm is switched off.  Circuit diagram :  Best Automatic Car Alarm Circuit Diagram As soon as the ignition is switched off, T, is off, T2  is on, and the buzzer sounds. At the same time,  monostable IC1 is triggered, which causes T3 to  conduct and the red LED to light. The silicon- controlled rectifier is then off, and D4 is reverse  biased, but the relay remains energized via its make  contact for a short time, preset by Pi As soon as this  time has lapsed, the...