Like if the load needed 200mA at the 4.5V then the 9V would only see a load of 100mA. Assuming a regulator with 100% efficiency (does not exist but makes the math easier) if we had the regulator provide 4.5V from the 9V battery, then the current drawn from the battery would be 1/2 of what the load at 4.5V draws.
9 volt battery voltage series#
A switching regulator acts as a transformer, and is mainly power conversion and not just series wasted heat. Using a switching regulator will not waste as much energy from the battery. If for some reason you really wanted to use a 9V battery then it would make more sense to have a "buck" switching regulator to convert the 9V down to 4.2-5v and then use a linear regulator after that. You can get a cheap TP4056 Lithium Battery Charger for it and then charge it with 5 volt USB chargers. I use a 250mAH rated one for a small ESP8266 project, a remote control. You are far better off using a 3.7 volt lithium polymer battery. A brand new fresh battery will have a voltage higher than that. The 9volts of the battery is the nominal value. Using a 9 volt battery makes finding an acceptable regulator so much harder. (not requiring much power) You need to also use a regulator that has a low voltage drop at the maximum current. Whatever battery you use, you need to use a regulator that does not consume much current when the ESP is in sleep mode. I have not done current tests on the ESP32 yet but from the documentation that Espressif provides the power supply needs to be capable of 500mA for the peak demands.įor battery use I use the 18650 lithium batteries for some of my ESP projects. And if the power supply can't deliver that the ESP8266 will not start. And the ESP8266 will draw 400mA peaks on start up. The ESP32 is a little more demanding of current compared to the ESP8266.
AAA batteries would have much the same problem as the 9V battery, although it might at least be able to boot up. The minimum I would use for the ESP32 is AA batteries. If you do use a 9V battery, then use a high quality alkaline battery, like a Duracell. Because the internal series resistance of the battery would limit the output voltage when there are higher current demands. And power dissipation of a regulator would not be a significant problem. Having said that, potentially the 9V battery could power the ESP32 for a few times before it would totally choke. (once you get the train rolling the power requirement is not nearly what it takes to get it moving) (or more) But it does not have the torque needed to get the train moving. It just can not supply the peak current that the ESP32 needs. parkolay liked Bi-Generator vertical wind turbine.The real problem with trying to run the ESP32 off of a 9v "transistor radio" battery is the lack of capacity of the battery.Vijay has updated the log for Electromechanical Refreshable Braille Module.skip hansen liked Flea-Scope™ USB O-scope (18 Msps, $13 BoM, WebUSB).Varlen has added a new project titled DrummaOne.River Burgess has added a new log for Bipolar Membrane Energy Harvester.aboogieman on Dark Trace CRTs, Almost The E-Ink Of Their Time.
9 volt battery voltage generator#
Ostracus on Dark Trace CRTs, Almost The E-Ink Of Their Time.Ostracus on Single-Button Keyboard Has Multiple Uses.Mr Name Required on Keebin’ With Kristina Hack Chat.Shonky on Inverse Vaccines Could Help Treat Autoimmune Conditions.Hackaday Podcast 237: Dancing Raisins, Coding On Apples, And A Salad Spinner Mouse 7 Comments Posted in Misc Hacks Tagged 9 volt battery, high voltage, hipot Post navigation Thanks to for noticing this sweet “DC hipot” hack via twitter! On the other hand, you should watch the video after the break to see what happens. Passing on this hack at home is strongly encouraged. Still plenty of voltage to be harmful or even deadly depending on the current emitted. In theory, 244 9 volt batteries in series should be nearly 2200 volts, but as measured (in sections), it “only” came out to a “measly” 2000 volts. Around 4:38, a capacitor is abused for yet more arcing. The air arc is probably the most impressive, but a CD doesn’t look happy after this kind of abuse either. There’s really not much more to it than that, but takes this setup through its paces arcing through air first, a LED light second, and then a CD. Here’s another hack that we would definitely discourage you from trying at home, 244 9 volt batteries wired in series.
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