# Tag Info

1 vote
Accepted

### Power Regulation

Your supply voltage is already quite low for the STA540. The chip can directly consume your battery voltage without any regulation, so don't add a regulator. You don't need it and it will just limit ...
• 13k
Accepted

### What does a 9 A battery do to a 3 A motor when using the battery for movement?

The Ah/hr rating on a battery tells you how much power you can draw over what time period. The Amp-hour rating tells you that the product of the current drawn and the time drawn will be 9 Ah, so you ...
• 12.2k
Accepted

### How do I convert a battery's 3.7 V, 2.7 A input to 24 V, 400 mA output? 12 V, 800 mA would also work

No reason to do a buck-boost here, a boost will work just fine. The main reason you would use a buck-boost over a boost is if you expect the input voltage to rise above the targeted output voltage. ...
• 96

### Only connect consumer to battery on button press

Here's a solution using schmitt trigger NAND gates from a 74HC132: simulate this circuit – Schematic created using CircuitLab G3 is simply an inverter, creating a nice low impedance square ...
• 16.5k

### Only connect consumer to battery on button press

The DFplayer has an output pin called "BUSY" which is low when playing and high when not. So you want to switch it off when the BUSY pin goes high. To make a circuit that turns off when it's ...
• 10.5k

### Trying to power a MC145010 smoke detector without a battery

@dandavis also deserves credit on this. I already had a 470uF near the ESP. Adding an other 470uF+100nF at the 9V side of converter seems to have solved it.
Accepted

### Trying to power a MC145010 smoke detector without a battery

The most likely cause is that the supply voltage from a switch mode boost converter is much noisier than virtually noise free supply from a battery. Perhaps filtering the noise away or just using less ...
• 114k