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Understanding the components of backlight circuit of digital watch

The two drums are coils, they shouldn’t be damaged since it’s just ferrite and few turns of copper. The red component is diode, maybe a zener but more probably a signal diode 1n4148 or similar. ...
Michal Podmanický's user avatar
6 votes
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How to identify this IC FG97

It's a SEMTECH SX8652 touchscreen controller.
nanash1's user avatar
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Could NVIDIA Boost INT8 Inference Performance by Redesigning the Chip Specifically for INT8 Operations?

Yes, you could get rid of hardware for things like floating point, trigonometric functions, etc and instead devote those transistors to more INT8 execution resources (adders, etc). Various AI ...
user1850479's user avatar
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1 vote

Implementing triangular ramp in simulation

The solution that finally worked is exactly as mentioned on the datasheet. I used a controlled current source element that was fed by a 1 or a -1 constant triggered by the high side switch gate. In ...
SM32's user avatar
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4 votes
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Z253 and N1 marking on chips - identification

Z253 is an Onsemi NC7SZ125P5X UHS buffer. (Source: taobao) N1 is a Diodes Inc FCX491 NPN BJT. (Source: lcsc.com)
nanash1's user avatar
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4 votes
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Is possible for information in a logical circuit to travel in the opposite direction as the current?

Is possible for information in a logical circuit to travel in the opposite direction as the current? Yes. (You assume silently that information is encoded in current. This is just one of many ...
the busybee's user avatar
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Decreasing the input offset voltage of two stage opamp to below \$1 \: \text{mV}\$

Assuming the offset voltage is originating from mismatch of the transistors and not from some systemic imbalance, you can parallel multiple transistors. Ideally that would reduce the imbalance by the ...
Spehro Pefhany's user avatar
1 vote

Is possible for information in a logical circuit to travel in the opposite direction as the current?

Yes. All it takes to match your definition is to send information by sinking current. So any open-drain output driving a LED or relay or some other load or sending data by sinking/pulling current ...
Justme's user avatar
  • 155k
5 votes

Is possible for information in a logical circuit to travel in the opposite direction as the current?

Certainly. An example is the 1-wire interface with a power supply line that also functions as a data line. If a device wants to transmit a 1, it pulls the line down for 1-15μs. If it wants to transmit ...
vir's user avatar
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2 votes
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How is the \$M^2\$ term derived in the PLL output phase noise spectrum?

The PLL simply "amplifies" the phase quantities by \$ M \$ within its bandwidth. Thus, a factor of \$ M \$ emerges in the input-output relation. When dealing with power spectral densities of ...
a360pilot's user avatar
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1 vote
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Please explain how these two different DAC configurations produce different output voltage ranges

Let's first reduce the complexity to something that is easy to analyze: The DAC core is just a fancy current sink that is governed by some digital logic that controls an analog block. For the analysis,...
MOSFET's user avatar
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1 vote

Please explain how these two different DAC configurations produce different output voltage ranges

For the 0 V to + 10 V range you're right, the resistor to pin 1 isn't used as it's shorted out by the connection between pins 1 and 2. The feedback resistor for the opamp is therefore 5 kΩ. For the 0 ...
Finbarr's user avatar
  • 5,808
2 votes
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Identification for L313 marking, 5 pins

VAL1 Based upon codes starting with VA this could be the obsolete S-1135C20-M5T1S LDO Voltage Regulators LINEAR LDO REG HI 60UA IQ 300MA IOUT. From the datasheet found linked on the Mouser website it ...
Chester Gillon's user avatar
2 votes
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Please explain why datasheet says to connect the feedback resistors in a particular way

The difference is in the input codes that you failed to highlight. Offset binary is bipolar so it needs less gain to swing from the null point. Straight binary needs twice the gain (for a given bit) ...
MOSFET's user avatar
  • 4,707
1 vote

Is VSSOP-8 packaging any different from SOP-8?

SOP-8 package is bigger than VSSOP-8, about double size. For SOP and SOIC the lead pitch (legs separation) is 1.27mm. For VSSOP, and MSOP, it's 0.50mm or 0.65mm, or even 0.40mm I think. And there are ...
Gos's user avatar
  • 489
1 vote

Is VSSOP-8 packaging any different from SOP-8?

I haven't performed a full search of packages, but found the question What are the known ambiguous SMD IC package which starts with: I just recently discovered (the hard way...) that VSSOP-8 is an ...
Chester Gillon's user avatar
2 votes

IC socket for SMD on Breadboard

It you may need to prototype multiple small surface mount package types in the same design, TI have the DIP adapter evaluation module which is described as: Speed up your op amp prototyping and ...
Chester Gillon's user avatar
5 votes
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IC socket for SMD on Breadboard

They are called breakout boards. You must solder the SOIC to the board. Search Digi-Key for breakout board. There are hundreds of choices for different SMD packages. Here are some examples from Digi-...
RussellH's user avatar
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3 votes

IC socket for SMD on Breadboard

Not that they'd be a good fit in your application, but you can find SOIC-8 ZIF (zero insertion force) adapters on breakout boards for test/burn-in/programming. Probably $30 for a low quality one that ...
vir's user avatar
  • 19.7k
5 votes

IC socket for SMD on Breadboard

The dip socket is unlikely to work. Even if you can solder the chip into it the pins on DIP sockets are not generally long enough to go into the holes on a breadboard far enough to make a reliable ...
GodJihyo's user avatar
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4 votes
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How do digital watches steadily increment the internally stored time without fluctuations in speed while running other logic at the same time?

As was commented, your standard digital watch doesn’t have a processor running code. It’s going to have digital logic doing everything in hardware, all in a single custom chip. Economy-of-scale says ...
DoxyLover's user avatar
  • 8,240
10 votes
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Can a 4066 IC work at 3.3V?

As the recommended operating conditions in the data sheet are 3 V to 18 V, you can expect it to function at 3.3 V. However, switching speed, Ron, and Ron match are only specified at 5, 10 and 15 V. At ...
Neil_UK's user avatar
  • 168k
2 votes

Can a 4066 IC work at 3.3V?

Recommended operating conditions say that 18 V > VDD-VSS > 3 V. So, it is also for VDD alone. So, yes it can work. See also others recommendations.
Antonio51's user avatar
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1 vote
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Can I go below recommended voltage range for a particular IC input pin?

The data sheet is quite clear: - ...
Andy aka's user avatar
  • 462k
1 vote

Can I go below recommended voltage range for a particular IC input pin?

You can because the data sheet does not forbid you to so. There is no mention what happens if you do go outside the recommended range, only the manufacturer knows that, which means you should ask the ...
Justme's user avatar
  • 155k
2 votes

ARM based microprocessor IC number, what is the exact model of microprocessor?

Looks like GD32F403RET6 as far as I can tell. According to the datasheet it could also be GD32F303RET6 or GD32F103RET6.
fandreas's user avatar
5 votes

Which IC is this marked as ATMLH2392DCM?

Atmel AT24C128C. Data sheet says it has a product code of 2DC and the M is the voltage range specification.
Justme's user avatar
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1 vote
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Device is not charging (how to test ic)?

Here is the most reasonable theory of what did happen. As @nanash1 noted, the IC is likely a linear TP4057 IC. From this and PCB layout, Pin 3 is the IC output. Now, the cell was replaced with a ...
Ale..chenski's user avatar
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1 vote
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What is the IC marked as 858Z TI 31JP7J3 (can see the photo attached)?

It's a Texas Instruments DAC80508ZRT 8 channel DAC. (Source: avaq.com)
nanash1's user avatar
  • 5,307
0 votes

Need for current protection on low current digipot

I have now realized that should the potentiometer receive 2.5mA of current there would be a associated voltage difference of 125 V across the max resistance, at which point I believe overcurrent would ...
Shai Morrison's user avatar
0 votes

Device is not charging (how to test ic)?

We can't look inside the IC, so we can't really know what goes wrong. Top of my head, several things might be happening: Damage from soldering to battery or IC IC noticed that over long-time average, ...
Marcus Müller's user avatar

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