# Questions tagged [negative]

The tag has no usage guidance.

134 questions
Filter by
Sorted by
Tagged with
1 vote
38 views

### Interfacing with 0..-2v Sensor using ADS1115

I'm designing a circuit to interface with a sensor that operates on a ±12VDC power supply and outputs a signal between 0 and -2V. I plan to use an ADS1115 ADC for reading this signal. Circuit Design: ...
• 41
185 views

### Measuring a voltage signal ranging from -2 to 2 volts into a 16 bit ADC circuit

I'm trying to read a voltage that represents a signal from a sensor. This signal can range between -2 volts to +2 volts. I wanted to read this signal to log it, but most ADCs (including ones on an ...
• 23
374 views

### What is negative PWM (with switched ground)?

I was reading documentation about flaps control unit for experimental aircraft, and I found, that indicator LEDs on device are dimming by something they called "...
143 views

### Inverting DC voltage [closed]

I want to invert a DC voltage of 12V to -12V in the simplest way possible, since this circuit will be used in a bigger rad-hard project. I cannot use directly a DC/DC converter or any other ICs, but ...
80 views

### Multiple negative analog signals to positive signals [closed]

I have multiple analog DC signal of sensors each connected via a coax cable. The outer layer of the coax cables needs to be grounded into a metallic wall for EMC capabilities radiation safety, thus I ...
• 3
754 views

### Which side is the capacitor negative on this board? (IO/10 marking)

I removed a capacitor (C1 (400v/15uf) - highlighted in the picture) from this board to test on another board and now I want to put it back but I can't figure out the polarity. The traditional symbol ...
116 views

### Regulating negative voltage with a positive LDO

I have Traco TEN 5-1221 to generate positive and negative 5 volts. I need to further lower the voltage to 1.5V. I decided to use a BA15JC5T for positive 1.5 volts. Is there a way to use it for ...
134 views

### Voltage of electric motor

What is the range(min value and max value of average motor) of a voltage in an permanent magnet synchronous electric motor? I am current working on a dataset of Permenant Magnet Synchronous Motor(...
1 vote
828 views

### Van conversion hookup point AC Earth to chassis negative

I'm helping my brother convert his van into a camper and installing solar panels, a leasure battery, and hook-up point, but I'm slightly confused. I've been working on the hook-up and loads of things ...
1 vote
107 views

### LMV431 to generate negative voltage

can someone show me how to use LMV431 to generate -1.24 V from -5V? below is how I use it for positive. Thank you
73 views

### How to make this homemade enable? Need the OUT voltage to become -6 V when the enable voltage is turned on to 3.3 V

I don't need to be using a MOSFET, just figured that would be the way to go.
1 vote
207 views

### Is it possible to share a common 0VDC (negative) between three DC switch mode power supplies - when two of them are in series?

I have a system that needs a 96VDC and 12VDC feed to operate. I have a pair of Meanwell RSP-3000-48 power supplies tied together in parallel to supply 96V and a single Meanwell HLG-240-12 supplying ...
• 11
93 views

### Pull negative battery to ground with MOSFET

I have an input signal that goes from +10 V to ground and I want use it to pull the node "A" to ground. The current will flow towards node "A" I was thinking using a NMOS, with in ...
646 views

### The minimum (negative) value of the exponent in decimal

I am learning computer architecture and organization. I am stuck in the following question. Can someone please help me? For a floating-point representation with 35 bits in the mantissa and 15 bits in ...
• 385
90 views

• 13
1k views

### Negative voltage supply

I've been trying to make a active load that would use a very small resistor, around 10mOhm as a shunt resistor. I've figured out how to make it, it's a common circuit, however since I need to use ...
125 views

### Get negative control voltage for a AS3310 chip

I'm trying to use a AS3310 chip to generate an envelope from a trigger/gate signal. The AS3310 expects for the ADR (attack/decay/release) control voltage 0 to -5V - for the S (Sustain) 0 to +5V I ...
• 15
626 views

### Designing two stage CE amplifier with negative feedback [closed]

I'm trying to design two stage ce amplifier with negative feedback using 2n2222 transistors. The circuit must have certain voltage gain, Rin, Rout, Vcc, low and high frequency filter. This is the ...
86 views

### Op amp with feedback

simulate this circuit – Schematic created using CircuitLab How to calculate Iout(current flowing through RL) of this circuit? All Resistors are of same value except the load resistor. Let the ...
1 vote
589 views

### Magic Eye Tuning Tube Variable Negative Voltage

I am thinking about several applications of magic eye tuning tubes as display pieces and had a question about their operation. I have attached a sample circuit from a datasheet for an EM84 tube. I ...
343 views

### Negative gate SCR

I've accidentally supplied the gate of an high power phase control thyristor (Vdrm=5200V and It(rms)=6500A) with a negative current (about two times the trigger current and four times the trigger ...
• 15
1 vote
146 views

### Operational amplifier and negative feedback

Let's consider an op-amp. In every book I've read till now, it is said that if we have: negative feedback finite output then we have: Vout = A * (v2 - v1) --> (v2 - v1) = Vout / A If A is very ...
• 616
1 vote
916 views

### What defines the sign of transistor rating values?

Here for example I have attached excerpts from two general purpose PNP transistor datasheets. One of them has negative values, other one positive. I would like to understand what defines these values ...
• 218
624 views

### LED indicators for 2 Positive voltages and 1 Negative

I have a seemingly simple question but I am getting stumped. I have a power supply providing +12v +5v GND and -12v. I would like to have an LED for each input voltage showing that they are working ...
743 views

### Generate negative reference voltage

In my current design, I need to include force measurement. A301 sensor is selected for this. Now, in order to be able to have analog voltage proportional to the force applied, I need to have negative ...
1k views

### negative binary representation and 4 bit BCD represenation are similar

While representing negative numbers in binary we use MSB as sign indication.In BCD we use 4 bits to represent numbers 8-15. How does a device(ex:computer) decide whether its a negative number or a ...
1k views

### Applying negative voltage to CMOS chips

I have a situation where it's possible a negative voltage may appear on the power supply rails driving CMOS chips. The negative voltage will be very limited in current, fed through a resistor. The ...
• 221
854 views

### Calculating power supply current output

I have a 15V power supply powering 2 Dc/dc converters that are the same. The converters are connected so that the outputs are 10V and -10V (the - terminal of the 10V converter is tied to the + ...
1 vote
108 views

### Battery life and negative current

I am working on a battery powered project. With a multimeter I've been measuring current on the "positive" side of a module and observe 5μA. However I thought to measure the "negative" side and was ...
• 123
1 vote
62 views

### Apply positive and negative voltage to component using single power supply [duplicate]

I have an electromagnet and a 12V power supply. I would like to apply +12V to the electromagnet at some times and -12V at other times. My current thought is to use four transistors (two NPN, two PNP) ...
• 163
559 views

### Function Generator - Signal without Neg or Gnd reference

I have a new PC based function generator (very cheap), and an old BK Precision function generator. The old BK Precision can output a signal without the ground or negative reference lead from the BNC ...
56k views

### When do I connect to negative terminal or ground?

Easy question (or at least I think). I've installed a siren in my vehicle which calls to pull power direct from the 12 volt battery. I currently have the circuit completed by connecting to the ...
628 views

### Analysis of Negative Input Resistance Op Amp

simulate this circuit – Schematic created using CircuitLab I'm having a difficult time analyzing the circuit shown and would appreciate some help. I'm just curious in order to get better at op ...
• 23
112 views

### Connection of dusl 12v NiCd battery packs [closed]

I have the 12v battery (it is actually 10 Ni-Cads in series), and, of course, it has a red wire coming from "+" and a black wire coming from "-". However, on the schematic I am confused about whether ...
11k views

### Where is the positive and negative on an antenna?

What I am wondering is how to build an antenna. Upon unscrewing my telescopic antenna from it's base, I see only a metal screw base, nothing more. The F Connector has a positive and negative (or ...
• 217