110 volts
AT89C51 can have a maximum of 6.6v as input voltage
It isn't dangerous to have a DC voltage on a co-ax input to a television but there is a small risk that it may damage the input. It certainly isn't regarded as good practice to allow DC voltages to reach inputs unless they are intended to deal with DC. There are a variety of devices such as signal amplifiers that can be fitted close to an aerial and powered by a power supply at the other end of the co-ax cable. In these cases, a DC voltage is applied to the cable but is not allowed to pass further down the co-ax cable to the television itself. If the cable is disconnected from the television, in some cases, the DC voltage can be measured but this is normally just some leakage from the DC filter in the power supply. Once connected to a television input, the voltage will normally disappear. If there is still a concern, talk to a qualified TV service engineer who will be able to identify the source of the 12V.
Voltage gain is the ratio of the output voltage of an amplifier to its input voltage.
You do not specify, in your question, what the 'input' device is.
The recommended voltage input for a 220 transformer is 220 volts.
You can regulate the input voltage for a UPS using additional line filtering techniques.
no difference...
The LM317 voltage regulator can be set to any output voltage from 1.2 V to 37 V. You must keep the input voltage between the maximum input voltage and the drop-out voltage for proper operation. The maximum input voltage the LM317 is guaranteed to bear is 40 V. The LM317 is guaranteed to operate when the input voltage is at least 3 volts above the set output voltage.
Rectifiers don't "stabilize the output voltage" of rectifier circuits when input voltage fluctuates. The rectifiers just rectify the input, and the output will fluctuate as the input does. Another form of "conditioning" of the rectified output is needed to address the issue of fluctuations. And we use the term regulation to talk about the effect of "stabilizing" an output voltage. Through regulation, the output will be resistant to changes in voltage when changes in the input voltage occur.
Yes, IF the input and output voltage is same as specified for box.
Yes. Input DC voltage would be root2 times the input AC voltage.
The ratio of output windings to input windings determines the ratio of output voltage to input voltage. The ratio of current is the inverse.