Contents
How is a 5V and 12V power supply constructed?
The above given circuit illustrates a simple approach to construct a dual DC power supply of 5V and 12V from the 230V AC mains supply. The Voltage ranges 5V and 12V are widely used in all kinds of simple electronic circuits, so its meaningful to learn this simple construction.
How to reduce voltage from 12V to 5V?
However, it can only supply a maximum current of 1A and you will also need a heatsink. It is simple to build: connect the 12V wire at the left most terminal of the IC, while looking at the inscription and with the pins down. Connect the 5V output for USB port at the right most pin.
How much voltage do you need for a 5V relay?
The resistor needs to drop 7 V with 12.5 mA going thru it. From Ohms law it needs to be (7 V)/ (12.5 mA) = 560 Ω. Your calculation is therefore correct. You should also consider the power dissipation of the resistor. It will be (7 V) (12.5 mA) = 85 mW.
Can a resistor drive a relay from 12V?
Yes, a resistor would work to drive this relay from 12 V. The resistor needs to drop 7 V with 12.5 mA going thru it. From Ohms law it needs to be (7 V)/ (12.5 mA) = 560 Ω. Your calculation is therefore correct. You should also consider the power dissipation of the resistor.
Can a 5 volt supply be used as an op amp?
The configurations shown in Figures 1 and 2 would likely be the ones to use with a five volt supply and a R-R op-amp. Be sure to use all of the components shown, minus the battery, of course. FIGURE 5. USB powered dual polarity supply that will provide up to 100mA.
Can a split supply be used in an op-amp circuit?
They need a split supply. The output terminal has positive, negative, and ground. But most power supplies have only a single output (positive and negative). So, you cannot use them to power op-amp circuits.
Can a USB supply be used as an op amp?
USB powered dual polarity supply that will provide up to 100mA. It allows for the conventional +/- op-amp power connections. For those of you that are marrying your analog circuits to a computer, you may want to consider the USB supply shown in Figure 5.