3 ms·
I... this article is a bit funny. I think it's extremely unhelpful to talk about a resistor divider as being a power supply, even though the author later shows
by bjt2n3904 5y ago
I... this article is a bit funny. I think it's extremely unhelpful to talk about a resistor divider as being a power supply, even though the author later shows how this fails in practice.
Voltage, current, and power are difficult enough concepts for newcomers. It is commonly asked, "Can I use a voltage divider to power a circuit?" The answer is usually no, unless said circuit takes far less than 1 mA.
- kazinator 5y agoAn time you use a linear-regulator, such as a crusty 7805 voltage, you are using a voltage divider to power the circuit. It is an active voltage divider that adjusts its characteristics to keep the voltage constant, but a divider it is nevertheless. The high side transistors inside it are simply dropping the input voltage to bring it to the 5V level, and dissipating the V x I product as heat.