Questions tagged [specifications]

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95 views

Understanding LED specifications (hobby kit)

I have an LED that looks like: It did not come with specs for the LED. In laymens terms, I'm trying to determine the technical term for the following descriptions. (What is the max amount of current ...
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2answers
114 views

What does the term 'min' mean in AAA Rechargeable cell current capacity?

While checking the specification of rechargable AAA Ni-MH cells, the specification shows 2 parameters Voltage say 1.2v and Current Capacity say 630 mAh. However the current capacity is preceded by '...
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2answers
87 views

How can I tell if a cable is rated for use as motor leads with a variable frequency drive?

I understand that the switching edges generated by a VFD can cause corona breakdown of the insulation on the motor leads. Due to this, it is recommended that some cables be used for VFD motor leads, ...
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3answers
747 views

diode selection for large current reverse bias, small current forward bias

I'm designing a circuit where I want to pass a small test current from one leg, but block a large "firing" current (rocketry) coming from another leg in reverse bias. I have a 5vdc indicator line (...
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3answers
151 views

a standard method for flowing down EMC/EMI requirements to internal modules

EMC/EMI standards (conducted/radiated emission/susceptibility) are well established for system boxes. However there appears to be no standards, nor methods for deriving a specification for internal ...
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1answer
86 views

Is it possible to approximate specs of a LED?

I am thinking about gutting a few infrared LED's from some old remote controllers and using them as part of a battery powered wii sensor bar. Obviously, I do not have the spec sheets for these LEDs, ...
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0answers
54 views

What happens when the chip enable active time limit is exceeded?

The datasheet of a FRAM chip (FM1608-120-P) says that "the device has a maximum /CE low time specification that must be satisfied". The datasheet does not state what the consequences are when this ...
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2answers
520 views

Peltier Module/TEG specs explainantion

I am looking for a Peltier module/TEG to power wearables and I'm not quite sure what specs I need or should be looking at. To be honest I am not quite sure what some of the specs even me. Essentially ...
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2answers
307 views

How many segments are permitted in CAT 6A cable run?

How many segments are permitted in an F/UTP CAT 6A cable run? Segment endpoints require peeling back the foil and untwisting the pairs, which I fear will affect data speeds. I heard that a cable run ...
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2answers
455 views

What is a zener diode's I_z rating?

I know that IZT is the test current at which the zener's reverse voltage is established. But what is IZ? (So I can enter the characteristics of one in CircuitLab.
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1answer
89 views

USB 3 to USB 2 Wiring

I have a USB 3 to sata connector which I know worked on my Raspberry Pi 3 (USB 2). I have now cut the USB 3 cable and wanted to solder the wires directly to the Raspberry Pi. This is so that I can ...
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2answers
2k views

What is meant by VCES in a transistor electrical specification?

I am studying the STMicroelectronic BUL216 NPN power transistor. Electrical specification like VCES is given by the Specification Sheet BUL216 Datasheet. Also, the VCEO spec. Both spec has to do with ...
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5answers
117 views

Why can optical usb cables not operate below 0°C?

The specifications of this optical usb cable specify operating conditions of more than 0 °C. What is the physical reason behind this?
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1answer
98 views

What chips does a Sony Ericsson (feature phone) use? (e.g. K510i, K610i, W705, C510) [closed]

I'm trying to replicate the behavior of these awesome Sony Ericsson phones by using Teensy 3.6 so I'm wondering what kind of specifications and chips do these phones have. The phones in question are: ...
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2answers
987 views

Are there open free USB designs?

I want to learn USB and its hardware interface and start with a trivial design. I found some VHDL in github for the ISP1362 and I wonder if that is a good starting point. I have already used Quartus ...
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1answer
248 views

Connecting Optical Fignerprint Scanner with Raspberry Pi?

I am new to electronics. I bought Rasberry Pi and a Fingerprint scanner for some project. Now I can't seem to find any details/Specification about the Fingerprint Scanner, and there is nothing ...
2
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1answer
3k views

Selecting a ceramic capacitor: Rule of thumb for required DC voltage rating

What is the rule of thumb for the DC voltage rating when selecting a ceramic capacitor (MLCC). Example: selecting a X7R decoupling capacitor, system voltage is 5V. Can I safely chose a capacitor with ...
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1answer
110 views

How To Check If An Oscilloscope Is DC Capable

I am busy working on some analogue synthesizers at the moment and just got the hang of OP-amp to some degree. I want to invest in a decent Oscilloscope something like 50Mhz-100Mhz. So based on advice ...
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3answers
1k views

Is there a standard stating how fast a fast fuse is, how slow a slow fuse is?

According to answers to this question there seem to be a standardized notation on fuses. For example F8AL250V means that it's a 8A fast fuse. On the other hand there is answers this question stating ...
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1answer
103 views

Does anyone have a manual or spec regarding an NEC JAPAN 45006705-210 0356MP010

As the headline states. It seems to be hard to get! The µC is in use in an Ferroli Arena A30 boiler. A datasheet could help to know how the pin configuration. A manual should even be more awesome. ...
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0answers
250 views

SATA compliance test

Is there anyone familiar with the SATA interface compliance? I'm curious about the testing method. For TX test, there are PHY/TSG/OOB test items. And, there are BIST-L and BIST-TSA mode defined in ...
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1answer
57 views

Am I exceeding a power supply's specifications?

I recently aquired an adjustable power supply and would like to know if its suitable for my project. It is a 300W power supply with the following specifications: Input voltage: 13V - 62V Max input ...
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1answer
847 views

Li-ion battery IEC 62133 compliance

Hei, Wondering if any of you have experience on secondary li-ion batteries (not battery packs) that comply with IEC 62133 certification? I can't seem to find abundant amount of batteries covering ...
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1answer
108 views

Spec sheet for a pulse generator: Interpreting current output

I am looking at the specifications of a device that produces a narrow pulse waveform, direct current, pulse duration < 1 ms, frequency variable from 5 to 500 Hz. The specs for this device say that ...
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2answers
515 views

what are the specs of a transistor that can't be find on internet?

It is part of a switching-mode power supply for a PC. There is a number: 1035 and a logo above this number, that seems to be a capital D. I am trying to find a replacement but it is not as easy as it ...
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2answers
1k views

How to work out how much pulling power an electric motor has in kg?

Say I have 5 kg mass on a spindle that has a diameter 5 cm and I want to move it up at 6 cm/s (just example numbers). How would I find out the specs needed for what electric motor I would need? I ...
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1answer
490 views

Exceeding the relay contact rating and connecting to Arduino

I have an Arduino. A suitable relay can be directly connected to an Arduino (with a flyback diode) if its coil is rated at 5 V and 40 mA maximum. However such relays have a limit on the ...
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3answers
4k views

Why do digital scopes sample signals at a higher frequency than required by the sampling theorem?

In the quest for a not so expensive PC scope/logic analyzer, I have found a nice little device it looks very well done and I know it will do the job. However looking at the specifications, I ...
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3answers
82 views

What does high fault coverage digital vector at an IC module mean?

I'm reading some specification docs on some integrated circuits and I came a cross this definition which I'm trying to understand. This provide the capability of running high fault coverage digital ...
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2answers
943 views

Electrical specification for minimum bias current available from 3.5mm cellphone microphone input?

If I understand correctly modern microphones integrated with headphones with 4-contact 3.5mm jacks for use with cell phones are condenser microphones, and usually contain a small, integrated amplifier ...
2
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1answer
536 views

Significance of bias when driving an LCD

I've got hold of several bare-glass T218010 LCDs and would like to drive them with a bare MCU (or, rather, an MCU plus a couple latched-output SIPO shift registers such as 74HC595). However, the only ...
15
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1answer
1k views

Where is the official RS-232 specification? [closed]

Searching with Google returned only 3rd party documents (i.e. from chip vendors or university lectures). Is there a main document of such specification, similar to USB?
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3answers
8k views

Why would I use 2N3904 instead of 2N4401?

2N3904 and 2N4401 appear to be very comparable parts in all specs. 2N4401 has a higher current rating, but otherwise they look to be about the same in price and everything else. Obviously it's ...
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2answers
617 views

72 Horsepower DC Motor [closed]

The previous owner of my sailboat installed an electric DC motor and batteries. I cannot find any specifications on this motor besides what is on the plate on the motor housing. The plate says: ...
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2answers
182 views

Can we proof a scavenged transformer of unknown specification?

This step-down transformer was scavenged from a power tool battery charger. It was designed to take 120V AC current and it outputs 20V AC. I can't find any specs for it, so I'm wondering what ...
7
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1answer
526 views

Does a zero-recovery diode really have literally zero recovery time? If so, how?

Some diodes are advertised as "zero recovery". Is this true? Or is it marketing speak for "so fast you couldn't possibly care"? If it's true, what makes a zero-recovery diode fundamentally different ...
1
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1answer
123 views

Why are properties of components often given at 1 kHz?

The title pretty much sums it up. Aside from DC, why are the properties of components often listed at 1 kHz? I keep hearing that it is a "standard", but why 1 kHz? This seems to be pretty common in ...
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2answers
172 views

What exactly makes ICs have different operating temperature maximums?

What exactly happens to an IC that is (for example) specified at maximum 85 degrees C? Also, being made from I assume similar materials, how is it possible for another chip to have a higher rating ...
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2answers
66 views

Will a PWM-Enabled MCU Work With Any Motor?

Why do so many MCUs specify what kind of motors they work with? For example: http://www.microchip.com/pagehandler/en-us/technology/motorcontrol/ Surely, the MCU has no concept of a motor and it ...
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1answer
390 views

JTAG Electrical Requirements & Pins Required

I'm a beginner designing a USB TO UART/ JTAG CONVERTER using FT2232H. I'm planning to use the TMS, TDI, TDO, TCK signals by directly connecting them to a header. I'm doubtful about this method. So, I ...
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4answers
361 views

How much do max current specs matter on VCC and GND?

I know that each of the output pins on most chips have a specification for the maximum power that can be drawn from that pin. However, some chips also have a spec for the max. current through VCC and ...
1
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1answer
49 views

DMM Spec Sheet Trouble

I am wondering what the "Transfer" column indicates in this spec sheet for the Keithley Model 2002 DMM, and how it should be incorporated into any uncertainty calculations. Thank You!
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1answer
4k views

What are the differences between optoisolator output styles?

Digikey lists optoisolators with several output types: Darlington Darlington with base Photo FET Photovoltaic Photovoltaic, linearized Transistor Transistor, with base What are the differences among ...
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2answers
72 views

CD4015BC static shift register: technical specs question

Currently looking into the specifications of the CD4015BC static shift register, I came across a couple of specs for which I have some questions: 1) The clock rise and fall times should be below 15 ...
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1answer
166 views

What is “x Us” in a contactor coil specification?

I have a data sheet that gives the coil pickup voltage as "0.85…1.1 x Us] and coil dropout voltage as "0.3…0.6 x Us". I am assuming that Us refers to the nominal or specified coil voltage, but why is ...
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3answers
319 views

I2C SoC explicitly not multimaster

While reading the guide of a chip I'm about to take in use (Intel Edison), I noticed the SoC is specifically not supporting multi-master. The SoC is always I2C master, it does not support ...
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2answers
62 views

Replacement power supply specs question

I have an old Philips clock radio/Bluetooth/android phone charger with a missing power supply. The device calls for 7v 2.5a with positive center tap. In my junk drawer I have a 7.5v 2.1a wall wart. I'...
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1answer
725 views

How can I tell the full spec of my step motor just by looking ati it?

I have a retro CNC machine (EMCO F1P) in my garage that I am currently tinkering with. I would like to replace the old motor control but use the existing step motors. Unfortunately the documentation ...
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1answer
1k views

NP0 C0G X7R (Y5V?) Typical Leakage Currents?

does anyone have some "typical" values or ballpark averages for the various SMT capacitor leakages? I assume that if the leakage is dependent on the dielectric, then NP0's would be "best." But how ...
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2answers
396 views

Can I use an open-drain NXP 74LVC07A output as level translator for an 8V CMOS input?

I'm designing circuitry that uses an NXP 74HC4051 analog mux with a +8V supply. An MCU with 3.3V GPIOs needs to control the mux S0-S2 selection inputs. I am wondering whether an NXP 74LVC07A, powered ...