Your charger voltage will automatically drop to battery voltage which is too low. Therefore you need to draw from your main power source, and connect that where my schematic says 3V. My schematic only shows the concept of operation. I don't know the voltage of your power source. You need to ensure that volt levels are safe for components. For instance, adjust the value of the safety resistor so the led does not get overmuch current.
i am using a 9 volt power supply and not the 1.5v battery as the main voltage?, i wasn't using the pulsating voltage as the main power for the 1.5 volt detection system, or a 1.5 volt battery. So after the main power supply goes through the 555 chip to make the 5v pulsating signal i need, that 5 volts will drop to the voltage to the battery or what do you mean?
NOBODY should charge the 9V alkaline primary battery in a smoke detector because the charging is poor and does not last long. In fact, NOBODY should ever charge an alkaline primary battery.
what is the minimum and maximum voltage that the battery will give a charge without blowing it up?
what voltage should you be charging standard alkaline batteries? i know that the voltage needs to be a little bit more than the battery voltage, so if the battery is 1.5 volts what should be the voltage charging it? what is the minimum and maximum voltage that the battery will give a charge without blowing it up?
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