Let’s create a 9V regulated power supply circuit to replace a 9-volt battery. These circuits can deliver 10 times more current than a battery and saving us time and money to replace it when it died. They are also safer than a normal switching power supply. To find out more read below.
Measuring the battery’s voltage is a practical way to determine whether it needs to be replaced. A fresh 9-volt battery should provide a voltage around 9 volts. However, if it measures less than 7.4 volts, the battery is likely dying and should be replaced. 9-volt batteries, like any other batteries, can suffer from physical damage.
I am using a power supply set to 9V and current limited at 0.6 amps to power a radio which includes a RF amp (using a transistor) and an audio amp. If the current limit is reached the device shuts off and beeps--it is an older power supply. The power supply is a GoldStar Gp-105.
Yes the voltage will be the same (9v battery's are 6 AAAA battery's) and the amperage available will be higher. but that is a good thing, it will only use what it needs so it will last longer Sigh so much misinformation here. Yes, you can put AA or AAA batteries in series to get a higher voltage.
The average 9V battery has a capacity of around 500 mAh. Most 9V batteries are made with alkaline or lithium chemistry. The voltage of a 9V battery refers to the amount of power it can provide to devices that use it as an energy source.
A 9v battery can have a voltage up to around 9.3v when new and will discharge down to about 4.8v but realistically, the end point is around 5.4v. Lithium based 9v batteries can be up to 9.6v. An old style battery (regular, carbon-zinc, "heavy duty") typically has a capacity of around 400-440mAh