# Tag Info

## Hot answers tagged voltage

7 votes

### Is it normal for a PCB to create a voltage drop at the power supply

Is this necessity to increase the voltage normal It depends what we consider normal :) It has nothing to do with aging, but everything to do with the age in which these systems were designed, and ...
5 votes
Accepted

### Why is capacitor equilibrium based on balanced voltages and not balanced charges?

The final state of "equilibrium" of this circuit will be when there's no longer any current flowing. That state can only be achieved when the voltage across the resistor is zero. If it's non-...
• 33.1k
3 votes

### Why is capacitor equilibrium based on balanced voltages and not balanced charges?

The solutions manual tells me that equilibrium means the voltages balancing. This doesn't make sense to me "Equilibrium" means "steady state": all circuit parameters are constant, ...
• 75.9k
3 votes

### Why is capacitor equilibrium based on balanced voltages and not balanced charges?

It looks like you have trouble with intuition, thinking the charges are going to be equal. Instead of doing the problem with commensurate capacitor sizes, which complicates things, use a much smaller ...
• 165k
2 votes

### ADS1115 need negative power supply for negative Vin?

Table 7.3 says the recommended Vin voltage stays above that on the ground pin. The absolute minimum (table 7.1) is GND-0.3, where you might expect the ESD diode to start conducting. You MIGHT get away ...
• 165k
2 votes

### Why is capacitor equilibrium based on balanced voltages and not balanced charges?

I was under the impression that in parallel, voltages are equal, ... No, the two capacitors are in series ... through R1. I am having trouble understanding the essential idea behind the solution. ...
• 12.7k
2 votes

### Is it normal for a PCB to create a voltage drop at the power supply

It they are TTL logic chips such as the old 74xx series then they should be run at 5 V with quite a low tolerance for reliable operation and can be damaged at < 6 V if I remember correctly. (The ...
• 175k
1 vote

### Determining the region of operation of these two diodes

I'd recommend this: Check all possible combinations. It's not many. I'll start, you fill in the blanks. D3 in reverse bias, D4 in reverse bias Both diodes are blocking. This is impossible, because ...
• 93.2k
1 vote
Accepted

### RCA RMS voltage

0 dBm is 1mW, to convert into voltage you need to know the impedance, which in this case is "600 ohms phone line", so 0dBm in audio context is 0.775 V RMS. In a RF context you'd use 50 or 75 ...
• 75.9k
1 vote

### ADS1115 need negative power supply for negative Vin?

The ADC operates with a differential input. But AINP and AINN must each ride on a common mode voltage such that the inputs never exceed maximum range. For single ended measurements, AINN must be ...
• 14.7k

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