Tagged Questions

Datasheets are the primary documentation about components, describing their functionality and electrical properties.

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1answer
27 views

Tactile pressure sensor and drift. Reading the datasheet

I am looking at the specs of tactile pressure sensor and I can't understand what this means: "Drift: <3.3% per logarithmic time scale" How should I understand this? Does this sensor drifts a lot ...
0
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0answers
21 views

Datasheet for Keyes IR Transmitter (KY-005) wanted

Can someone help me find the datasheet for the Keyes IR Transmitter (KY-005)? I know how the pins work, I just need to figure out its voltage drop and how much current should go through it. Thanks! ...
0
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2answers
31 views

What is Vcc-2 referring to in the Texas Instruments Tech Sheet for the SN74AS138?

Total noob here. The tech sheet can be found here: http://www.ti.com/lit/ds/symlink/sn74as138.pdf In the VOH parameter for the SN74AS138 on page 5, it states that it's MIN is VCC-2. What does that ...
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0answers
32 views

Sony RMT-CE75A protocol

I am planning to use an old Sony remote I found around my house for a remote control project. It has the remote number RMT-CE75A and it says Radio Cassette. I am trying to figure out the protocol ...
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0answers
28 views

Can DRV8837 be used to drive two DC motors in all four ways?

Knowing that some motor drivers do not perform well under low input voltages, I have found that this works well; but how do I drive motors in the following four ways: ...
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0answers
23 views

How do I find the maximum surge current of a zener from the given thermal resistance curves?

I'm driving a MOSFET, and I want to protect its gate with a zener diode. Here is the MOSFET data: ...
1
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1answer
73 views

Which one of these transistors is equivalent to 2N918 NPN?

This is an FM radio receiver. Q1 is 2N918 NPN transistor but it is not available for me. Which one of the following transistors is more equivalent to Q1 ? BC547 TL431 s8550 s9014 2n5401 ...
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2answers
89 views

STM32F103 - TIM5 doesn't exist on medium density devices ? How do I tell what else is missing?

I've tried setting TIM5 as a timebase timer with an interrupt, when the compiler gave me the following error: 39: error: 'TIM5_IRQn' undeclared (first use in this function) Than I though I'll ...
4
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1answer
71 views

Driving 259mA stepper motor with a 2N4401

A while ago I asked a question about driving a stepper motor using a 2N5550 and was advised that it wasn't really capable/a good idea. I received a good answer but would like a bit more information ...
0
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2answers
168 views

Panasonic Eneloop BK-3MCC (4th gen) - where I can find maximum discharge current?

Im looking for some official information source about maximum current for Panasonic Eneloop BK-3MCC rechargeable batteries. All I found is single page data sheet, there is just 1 table (nothing about ...
5
votes
2answers
147 views

What does 25°C mean on a transistor data sheet?

The background is, I'm trying to understand how well a typical transistor obeys the Ebers-Moll equation at constant (junction) temperature. See this snapshot taken from the Fairchild datasheet of the ...
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1answer
25 views

Pinout for EA-X40027AR

Can anyone show me a pinout for the Character LCD EA-X40027AR from EPSON? I've already found a datasheet but it has no pinout...
0
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1answer
63 views

Unusual Lemo PCB sockets (male PCB contacts, 2-pin 5B, etc)

I am trying to construct a comprehensive Kicad library of Lemo connectors. While working through the "normal" datasheet (unipole_multipole.pdf), I found several combinations appear to be missing. For ...
0
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1answer
35 views

What is bus hold LOW or HIGH current refer to in the data sheet?

What is bus hold LOW or HIGH current refer to in the data sheet? (Specifically looking at this data sheet for a translator buffer): http://www.nxp.com/documents/data_sheet/74LVC_LVCH2T45.pdf
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1answer
81 views

2N7002 Continuous drain current?

I'm currently looking for some MOSFET's to do some RGB LED lighting with using PWM. I found the 2N7002 in SOT-23 packaging (datasheet). According to the datasheet the MOSFET can handle a continuous ...
1
vote
1answer
66 views

Using PS2501A-1-A Optocoupler. Need help understanding datasheet

I'm experimenting with circuits to trigger my camera shutter and camera flash. My plan is to build a 2-stage trigger for high speed photography that triggers the camera a fraction of a second before ...
0
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3answers
91 views

Alien circuit component

I am modeling chip ‍MC14538 in PSPICE by building its internal circuit from the datasheet. I, however, can't figure out what ...
0
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1answer
147 views

Transistor letting 12Volts through collector->emmiter withouit being damaged

I have made a simple digital amplifier using 2N4401 Philips switching transistor. simulate this circuit – Schematic created using CircuitLab I have tested this amplifier on 5 VDC and it ...
0
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2answers
56 views

Need help finding datasheet for Mitsubishi Electric AA11SB6C-ADFD TFT

Searching datasheet for Mitsubishi Electric AA11SB6C-ADFD LCD display. This LCD is discontinued product, no information on official site. Already tried sites like datasheetarchive, alldatasheet. Still ...
0
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0answers
79 views

Can't find Broadcom BCM4329 datasheet

I need to find information about my phone energy consumption and I can't find a proper datasheet about the BCM4329 chipset. Does someone have it? I'd like to create a power profile for PowerTutor in ...
5
votes
5answers
250 views

Which parameters in datasheet give information about a BJT's step response quality?

I did a test with randomly chosen 12 NPN BJTs. I applied a clock pulse to each of them and observed their collector voltages. Some of them showed very low rise time, while some responded terribly ...
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0answers
93 views

Interpreting Data Sheets (“Typical Applications”)

I've recently been researching various transceivers, but I run into trouble as soon as I get to the "typical applications" section of the data sheet. With the Si4464 for instance, the example ...
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2answers
95 views

Regarding miniature solar panels

I am a bit confused. I want to buy a miniature solar panel like this. The problem is that all the miniature solar panels online in their specifications they give the peak voltage and peak current. ...
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0answers
24 views

Current consumption estimate for frequency dependent specification

I am carefully calculating current consumption for current budget limited device. Certain switching devices such as integrated opto-isolator gives current consumption specification in a form of X ...
1
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1answer
79 views

Datasheet of an unknown IC

When reading the Platinum Resistance Thermometer Manual, I was faced with this unknown IC (see pp. 38 from the manual): I searched the web with the following keywords: ...
2
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1answer
67 views

How do I use the measurements from the datasheet to create a footprint?

I'm trying to make a footprint for a MPU-6050 6-axis gyroscope and accelerometer. I've added the first 12 pins (out of 24), but now I don't know how to proceed. I've added pin 1-6 and 13-18 but I ...
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3answers
248 views

Need help finding datasheet or pinout for Toshiba TCD2907DG

I really want to play with Toshiba TCD2907DG - this is color linear CCD sensor. I've found a number of datasheets for other TCD*, but not this one. I would really appreciate any reference to ...
1
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1answer
67 views

Am I interpreting this relay pin diagram correctly?

I'm using a relay for the first time and am unsure if I'm interpreting the pin diagram given in the datasheet correctly: I know a SPDT relay should have five pins: ...
0
votes
1answer
49 views

Avalanche Photodiode Current Gain

I'm designing a readout circuit for an APD manifactured by Hamamatsu Photonics (datasheet). However, I've found myself lacking some information about exactly how would the device behave in my ...
2
votes
2answers
78 views

Finding required maximum current rating for a diode which will run in PWM mode

Consider a diode rectifier which will transfer a PWM signal. The duty cycle rate of this PWM signal is \$D\$ (\$0 \le D \le 1\$). The diode on state current is \$I_{ON}\$, and no current will be drawn ...
1
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2answers
60 views

Extra pins on HD44780 lcd

I am looking at ordering this lcd https://www.sparkfun.com/products/255, however when looking at the picture it seems that there are some extra pins on the right side not described in the hd4470 ...
0
votes
1answer
37 views

What is the ALS and BLS pin for on the ISL83204A full-bridge driver chip?

The datasheet for the ISL83204A full-bridge driver chip documents "low sense" pins that connect to the source of the bottom N-channel MOSFETs. As those are typically connected to ground, what is the ...
0
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1answer
151 views

How these circuit diagrams in the datasheet was made? [closed]

I've seen so many IC datasheets, and so appreciate the elegant reference circuit diagrams they've made. I'm not meaning the 'function' of the circuit, but the 'beautiful' schematics itself, such as ...
0
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1answer
84 views

How to use MOSFET thermal data for simulating in software

I have a MOSFET (irfb7434pbf) acting as load switch in a circuit. The usual operation is well within the SOA region, but, on situations where the load would short circuit, the MOSFET is set to limit ...
1
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1answer
164 views

Help me understand this shift register timing diagram

My basic understanding of using a shift register to convert serial to parallel data is this: On every clock pulse, the state of the serial data pin is read As data is read, it gets shifted in to the ...
0
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0answers
177 views

Finding/figuring out pin configuration on undocumented components

I recently purchased an assorted set of LCD/LED displays, and inside there were a set of components which I cannot find a datasheet for upon googling the component number. For instance in the ...
0
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1answer
80 views

How to interpret this data sheet?

I'm really confused understanding the following device manual:https://www.endevco.com/product/prodpdf/136.pdf I don't understand most of what they write. Any one has some idea about these terminology? ...
11
votes
4answers
758 views

How to read Scaled Graphs?

Please ignore the graphed lines, those are irrelevant to the question, it's the graph itself that's relevant. I see this type of graph used all the time, between ...
1
vote
1answer
101 views

how to calculate Ic as the current through the collector and function of the transistor

I am going through this tutorial, they state that "Ic is the current through the collector and function of the transistor" however I haven't really been able to look at the data sheet and figure out ...
1
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3answers
171 views

Reference to understand LED data sheet specification, characteristic and way to use them

I'm trying to build my own IR-led light with multiple LEDs. I've bought a TSAL6100 IR led but I'm not sure how to interpret the data sheet, I can't find any reference in internet. Can anybody tell me ...
2
votes
1answer
184 views

Understanding 74LVC245 datasheet and current source/sink

I'm using a SN74LVC245A (datasheet) to shift 5V TTL down to 3.3V so I can read the signals with a Raspberry Pi. However I am getting really weird results (a 60Hz input signal is picked up by the Pi ...
0
votes
3answers
96 views

Will this relay handle my current and voltage requirements?

I have this relay: SONGLE SRA-24vdc-cl I want to use it to run 240V 11A device. I can see in the datasheet it can be up to 20A (section 7, line 4-5), but the relay is so small and its legs so ...
0
votes
1answer
176 views

Where to find I2C register information for MAX21000+?

The datasheet for the MAX21000+ IC contains a table listing all of the registers and their default values but doesn't include any description of each of the register bits. I assume there must be a ...
0
votes
3answers
38 views

Find product lead dimensions

I am building a project for a robot on breadboard, and I have come across the need for a voltage regulator. I have an existing voltage regulator, but it will not fit into the holes on my breadboard. ...
2
votes
3answers
122 views

How to find info on part efficiently?

I'm not exactly a novice to electronics, but my problem is closely related, and I still feel like a complete newbie at those times. I have no problem sourcing parts for new projects. Part of that is ...
0
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3answers
112 views

LTC2485 I2C Data Format

I am trying to understand the I2C data format of a 24 bits ACD (LTC2485). The data sheet says it returns 4 bytes (32 bits integer), but is unclear as to where the 24 bits I seek are located. Here is ...
2
votes
2answers
92 views

How to connect AFC terminal on Crystal Oscillator

I'm thinking of using a Temperature compensated crystal oscillator in my next project, specifically the TXC 7L-38.400MBS-T This device has an AFC (Automatic Frequency Control) terminal, but no ...
0
votes
1answer
114 views

Does SAM4S have FPU onboard?

While trying to use Atmel's ASF library, they say __FPU_PRESENT: Initialize macro __FPU_PRESENT = 1 when building on FPU supported Targets. Enable this macro for M4bf and M4lf libraries ...
6
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2answers
224 views

MOSFET Difference between Normalised On Resistance and Output characteristics

In the datasheet for STP36NE06, it has two graphs which seem to contradict each other: In the graph on the left, for Vgs=10v and ...
1
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3answers
178 views

I need a basic primer on interpreting vacuum tube datasheets

I am building a prop for a film that needs to have a bunch of glowing vacuum tubes on it. Unfortunately, beyond basic "valve theory", I'm not finding a lot of information about how to interpret the ...