Questions tagged [specifications]

Specifications for an electronic component provide the basis for parametric part selection for operation or optimum performance of a circuit or to prevent damage to integral or connected circuit components.

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PID control with anti-windup time specifications

I have scoured the internet for a quite some time now and could not seem to find the answer to this. Is there a formula that approximates, with these specific gains (Kp, Ki, Kd, Kt), the rise time, ...
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NEC asic information from around 1990

I'm looking for datasheets with specification for the NEC ASIC/Gate Arrays from around 1990. More preciselly, any information with specifications of their ASIC/Gate Array lines. I would like to known ...
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How to know if an opamp can drive capacitive loads?

There has been a lot of questions about how to stablise opamp circuits driving capacitive loads. However, I know there are some op amps that are designed to drive capacitive loads but I am struggling ...
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What can I assume for the voltage tolerance of commercial 12 VDC equipment?

I am thinking about 12 V backup power supply options for my home networking equipment; these run from 12 VDC wall warts supplied with the equipment. The data sheets for such equipment typically say ...
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4 answers
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10000 pF - so many zeros

Why are 10 nF capacitors sometimes (usually) specified as 10000 pF? Why are we trying so hard to avoid nF? Seems unnecessary and error prone. Note: Question also relates, of course, to 1 nF vs 1000 ...
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2 votes
2 answers
307 views

Questions about relays specifications

I want to use a relay to switch high power LEDs ON and OFF. Nothing out of the ordinary yet. My problem comes from the fact that my control voltage is not stable (it varies from 5V to 12V for example)....
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-1 votes
1 answer
57 views

Interpreting spec sheets for an inverting op amp

I'm interesting in putting together an inverting op amp to take a signal voltage from 10 V to 0.01 V (Gain = -60 dB). By signal voltage I mean the current input and output will be low (e.g., <1 mA)....
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58 views

Acceptable SNR for a Sound Level Meter

I'm designing a low power (<150mW) sound level meter (SLM) using a 24bit ADC (preliminarily using the LTC2512-24). This is for audible frequency range signals only (20Hz - 20kHz). I'm focused on ...
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2 answers
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How to use units given for heatsink thermal resistance?

In looking for a heatsink I came across a company giving the thermal resistance of extrusions in °C/W/3in. How do I use this? Say I use an extrusion with a specification of 1.5 °C/W/3in and get it ...
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1 answer
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Is it ok for a DC socket 5.5x2.1 to supply higher current than in the specifications?

I have recently bought a DC socket similar to the one below: https://de.aliexpress.com/item/32681671586.html. It is only used as a plug to connect a small circuit with a heating wire so there are no ...
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9 answers
289 views

Why is power specified in watts rather than amperes?

This probably has an obvious answer I'm missing, but searching the web only gave me information on how watts are defined, not why we use them. Many electric appliances (from things used to build ...
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Audio transformer power level

I am going to use SP-69. https://catalog.triadmagnetics.com/Asset/SP-69.pdf Its power level is 50mW. I am going to use DRV135 to drive audio transformer(SP-69). Output voltage of the DRV135 is 7Vrms(...
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1 answer
41 views

reading specification sheet of a cable

I'm having trouble reading the following specification sheet: https://www.molex.com/pdm_docs/ps/PS-15166-001-001.pdf if it doesn't work, I just pressed the datasheet button in this product: https://...
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18 votes
4 answers
7k views

Electrical reason for the minimum altitude (-50 feet) in the computer specs?

Are if there any electrical reasons not to operate or store my Dell OptiPlex computers below the altitude of -50 feet, as written in the specifications? Screenshot of the original Dell OptiPlex ...
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1 answer
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Understanding ADC input voltage range from its specifications

I want to use this ADC, an LTC2344-18, a quad, 18-Bit, 400ksps ADC. On page 15 you can see that the analog voltage input range can be set to +-Vrefbuf. Vrefbuf can be set to 2.5V to 5V. This would ...
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2 votes
2 answers
131 views

What are the standards for hand placing components?

Is there any written specification for the orientation of components on a manually assembled PCB, including both THT and SMT passive components? 'Manually' because machines can be easily setup to ...
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-1 votes
1 answer
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Spec sheet notation: 2 dots between numbers

I was comparing spec sheets for the AH3503 and the SS49E when I ran into notation I have never seen before: a number, followed by 2 dots, followed by another number. What does this notation mean? ...
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3 answers
154 views

How are desired specs decided upon in a common emitter amplifier circuit? (beginner)

I have been reading up on amplifier circuits recently out of curiosity and would like to attempt designing my own. However, I would first like to understand how various amplifier specifications are ...
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3 answers
400 views

Are "anti-surge resistors" just regular resistors?

I am looking for high-power SMT resistor, and found this guy: My question is: what does "anti-surge" mean, in the context of a resistor? Is it just the suggested application (a crowbar ...
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2 votes
1 answer
997 views

Can MOSFET exceed breakdown voltage without being permanently damaged?

I just have a simple question that I can't find a simple answer to anywhere. Is it possible to exceed the breakdown voltage of a power MOSFET (to short circuit it) without causing permanent damage? ...
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1 vote
0 answers
45 views

What does the electrolytic capacitor specification E 9 A 105 CF mean?

What do these electrolytic capacitor specifications mean? E 9 A 105 \$^\circ\$CF Is its maximum temperature 105 Celcius or 105 Farenheit? It has both letters.
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1 answer
46 views

What do these forward currents at specified wattages mean?

An LED I'm looking at has various specs listed that I can't make heads nor tails of. It is listed as a "3W LED" supporting a 2.5V minimum and 3.6V voltage. However, "Forward voltage&...
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8 votes
1 answer
789 views

What are the 9V battery terminal size specifications?

I'm trying to find the dimensions of a 9V (PP3?) battery (no specific chemistry). For some reason it's giving me a lot of trouble. I've been able to find most of the information (I checked a bunch of ...
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Design a BJT Amplifier to meet all the given specifications( Using LTSPICE)

Given Parameters: 1KHz 10mV sine wave as excitation(Vin) Specifications to be matched: Input Resistance(Rin) = 18 KΩ, Current gain = 33 dB, 3 dB Bandwidth = 425 KHz We are allowed to vary R2,R3( ...
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1 vote
2 answers
438 views

How to get working "specs" of iMac fans from logic board schematics? [closed]

I would like to salvage these three fans They come from an Apple iMac 17-Inch "Core 2 Duo" 2.0 (Late 2006 - iMac5,1 - A1208 - 2114) CPU Fan Apple Service Source P/N: 922-7641 Apple P/N (on ...
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4 votes
1 answer
154 views

Humidity design requirements

I have to design a electronics device that is specified for environmental operating conditions of 0°C to 60°C with 5% to 95% relative humidity (non condensing). I think the temperature part should be ...
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1 vote
1 answer
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Op amp advertised as BW = 105MHz, but GBP is actually 70MHz, what's being spec'd differently?

I just came about an op-amp spec where they say, "the Op-amp X is unity-gain stable with a small-signal unity gain bandwidth of 105MHz.." As you continue to read, it then says, "with a ...
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4 votes
0 answers
441 views

So can we just draw 500 mA from any USB port without enumeration now?

The USB Type-C Spec R2.0 defines the USB Type-C Current feature, in which the power Sink observes the voltage on the CC pin to determine how much current is available from the Source, which falls into ...
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1 vote
2 answers
391 views

I have a solar panel with below specifications. I have some questions

As in picture Vmp = 17.40V and Imp = 0.58A implies Power = 17.40*0.58 ≈ 10W. Does it provide 0.833A (10/12) at 12 volts? What does "Max. System Voltage 800VDC" mean in the picture ?
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2 answers
138 views

Understanding specifications with regard to current draw of components NL17SZ08, 6N137 and 74HC165 and other current-related questions

I am trying to calculate how much current some components will draw. However, it is not clear to me from the datasheets. I also have several other questions. Firstly, the NL17SZ08 AND gate MAXIMUM ...
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1 vote
2 answers
93 views

Component specifications needed for a high voltage front-end

I have an ADC here that in the datasheet has this example application circuit for a 100 - 240 VAC front end voltage measurement. If I was going to build this circuit, what ratings should my parts ...
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3 votes
1 answer
676 views

What does %FS (Full Scale) represent in load cell?

Lets say that a load cell has these specifications: Rated Load = 500 g Rated output = 1 mV/V Excitation voltage = 12 V Creep = 0.02 %FS / min Then the output range should be 0--12 mV. Does %FS mean ...
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-2 votes
1 answer
76 views

Which transistor ratings do I use when calculating something?

Let's say I want to calculate VBE for a transistor (for example). What do I use? VCE (Blocked) or VCE (Saturation) or VCE (max)? Let's say I want to calculate Ic/Ib, what do I use? Ic/Ib (blocked) or ...
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1 vote
1 answer
125 views

What do these diode part numbers mean? [duplicate]

While selecting a diode, I came across these two, which appear to be the same, save the ending part numbers after a "/" (i.e. one is 54, the other 73). I've surmised from JEDEC 609B section ...
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0 votes
1 answer
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Understanding Solid state relay specifications

I've been looking for a solid state relay that can switch 240V from a 3.3V signal. Looking at DigiKey, with a very large selection, I'm not sure how to filter my search (screenshot attached). How do I ...
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0 votes
1 answer
64 views

How do I find op amp specifications regarding voltage limits?

This question is perhaps a bit unusual and is about how to read/interpret specifications. I have been doing some testing with a common difference amp (LM324) and have also used LTSpice to double ...
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1 vote
0 answers
396 views

Use USB-C alternate mode pins for custom signals?

I am working on a product that is made of 2 parts: a host with a male USB-C connector and a device with a female USB-C connector that plugs onto it. The plan is to use USB-C because it's a nice ...
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0 votes
2 answers
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Motor specifications - how to compute allowable running time for power levels between the continuous and peak specs?

Say a motor is rated for 20 N·m continuous torque, and 35 N·m peak (peak = for no more than 30 seconds). Alternatively it may be specified at with continuous/peak currents, but if the motor efficiency ...
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0 votes
3 answers
384 views

Big Muff Pi Black Russian Pots

I try to repair a Big Muff Pi Black Russian, which was assembled in 2001. Unfortunately, I don't understand the labeling of a broken pot. See picture below. Since the device was assembled in Russia, I ...
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1 vote
1 answer
245 views

Wide range Ohmic region Mosfet [closed]

I would like to have a N- Channel (Enhancement mode) MOSFET with wide range of Ohmic region for my project. It's like Vgs varies from 1V to 5V (Ohmic region), Vgs threshold should be >5V, Ids ...
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3 votes
1 answer
61 views

Details about Total Access Communication System (TACS)

I'm not sure if this is the right place to ask. I am trying to build a base station for a TACS (Total Access Communication System) phone, but I have not found any detailed document about it. The most ...
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1 vote
2 answers
191 views

How much does voltage affect the light frequency output of an LED?

I have a large array of LEDs that I need to be true to their datasheet light frequency emission (ex 635 nm.) The LEDs require Vtyp @ 20 mA ranging from 2.2 V to 1.2 V. Some are within 0.1 V of each ...
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4 votes
2 answers
948 views

What are the max. overmold dimensions for USB-C plugs?

In contrast to earlier USB specs, the USB-C specification doesn't seem to define a maximum width and height of the overmold part of the plug (according to figure 3.3, there is just a length defined). ...
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-2 votes
3 answers
435 views

What does "p-p" mean in a spec sheet?

I've been searching for what these unit abbreviations mean, and can't seem to find anything. I'm hoping for some help. I'm looking at a spec sheet for a Vacuum fluorescent display For the Grid and ...
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0 votes
1 answer
135 views

LED current source safety margin

I have a power LED that requires 600mA at around 25 Volts. Since there are mainly 24 Volts and 36 Volts power supplies available on the market for a reasonable price, I needed to choose a 36 Volts ...
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0 votes
1 answer
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Meaning "Colay with mSATA"

In a datasheet of a embedded device (this one in my case) what does it mean that the PCIe bus is conneceted to a socket that says "Full-size Mini-PCIe (colay mSATA)"
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1 vote
2 answers
44 views

Should I look at nominal or max battery voltage for choosing resetable fuse?

I am building a LED/Camera control circuit that is going to be using a 14.8V Li-Ion battery as a supply. I want to put a resettable fuse to prevent short circuits from blowing up too much since this ...
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2 votes
1 answer
394 views

What does Bias Repeatability tell me in an IMU's spec sheet?

If there is a standard interpretation of bias repeatability as it applies to a gyroscope, what is that interpretation? This document indicates that it represents the average change in bias between ...
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0 votes
1 answer
109 views

How to determine transistor specification range for voltage and current (in relation to design requirements)

Attached is my current circuit for using a 5V logic output device to control 24V going to a load with max current draw of 14mA. (Ignore the name for transistor Q1, that is just a random NPN BJT). ...
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1 vote
1 answer
26 views

Interpolating output specs on SN74LVC1T45 transceiver

Section 7.5 of the datasheet for the SN74LVC1T45 shows minimum HIGH and maximum LOW voltages for output lines of the chip. Values are given for several different Vcc values (e.g. 2.3V, 3V, 4.5V). ...
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