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3 votes

Voltage ripple driving class D amplifier

When you output a 1 kHz sine wave, the amp draws lots of power at each of the tips of the sine, but much less power when it is outputting almost zero voltage/current. The tips of the 1 kHz sine wave ...
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1 vote

Problem with SN7407 output

I think maybe the two halves of your breadboard's bus bars aren't connected together. Those red and blue lines are broken in the middle, indicating that they are two individual half-length bus bars. ...
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  • 9,306
3 votes

Switching IC for analog/composite signal

Yes, but: Analog video signals (Composite) use 75 ohm coax cable for transport, so you must match this impedance with a 75 ohm resistor to GND at the input side. There you can connect the analog ...
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  • 3,572
0 votes

Problem with SN7407 output

I can’t say if this will fix the problem, but the datasheet is pretty adamant about not leaving any floating inputs. I suggest you make sure to follow all of the requirements in the datasheet.
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2 votes

Switching IC for analog/composite signal

A 4066 is nothing like a mechanical switch. Once you understand its characteristics, though, it is possible to use it in many cases a mechanical switch would be used. Video switching requires ...
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1 vote

Switching IC for analog/composite signal

The CD4066 works like a mechanical switch, with several key limitations vs. a mechanical switch: the switched signal cannot exceed the CD4066 rails AC coupling isn’t recommended unless a DC-restoring ...
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6 votes

Switching IC for analog/composite signal

Yes, 74HC4066 has been used for tens of years for composite video switching so you should be able to use it. No, it is not the same as mechanical switch.
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  • 93k
1 vote

Problem with SN7407 output

At the output you have a pull-up and a pull-down: . When the buffer is on (low), you will see ~ 0 V. When high (off), you will see \$15\,\textrm{V} \times \frac{R_3+R_L}{R_L+R_3+R_4}\$. This should be ...
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23 votes
Accepted

What IC is this TO-220?

I think the first '5' is a 'B". A BTB06 is a '6A standard and Snubberless™ Triac'
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  • 725
3 votes
Accepted

PLCC adapter -exists?

I did a quick search for "PLCC plug" and got tons of viable hits. Image search shows exactly what you're looking for to help narrow results https://www.ironwoodelectronics.com/products/plcc-...
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  • 1,205
1 vote

How to improve output swing of an NMOS pixel circuit?

However, for some reason the capacitor in this configuration doesn't charge up to 5V only to about 4,2V losing almost a volt on the output range. Can someone explain what is the reason for this? This ...
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  • 390k
0 votes

How can I shorten the width of a pulse?

You can detect the rising edge, then do something. You can run a timer or use a delay, you can't do anything with the falling edge, it's not deterministic. There are many circuits that can do the ...
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  • 64.6k
6 votes

What may happen if I leave out bypass capacitors?

From listed document: • Pin 1 is the internally generated 1.2V core power rail. Connect 2.2-µF and 0.1-µF capacitors from Pin 1 to ground using wide traces as appropriate for power distribution. Do ...
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9 votes

What may happen if I leave out bypass capacitors?

My question is, on the pin VDD_1.2, what if I don't populate the 2.2uF and 100nF capacitors? The two bypass capacitors have different roles. Every capacitor has internal inductance (often called ...
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  • 389
15 votes

What may happen if I leave out bypass capacitors?

These capacitors smooth the output voltage of the internal linear regulator that powers the logic circuitry. Without these capacitors the voltage will glitch whenever there is a change in current draw ...
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  • 52.2k
23 votes
Accepted

What may happen if I leave out bypass capacitors?

You can't predict what will happen if there is insufficient decoupling. You can get any manner of glitches, hiccups, errors, and latch-ups and it may be the same one every time, or a different one ...
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  • 48.3k
6 votes

What may happen if I leave out bypass capacitors?

The answer is the same for all components. If the component is used outside the conditions listed in the data sheet, then the component might not work within the specifications listed in the data ...
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2 votes
Accepted

Does anyone have a datasheet for the AMS FUA78MG IC?

This site claims to have the FUA78MG for sale, but gives no details. It does, however, have photos. The ICs in the photo are marked "UA78MG." Data on the UA78MG four terminal variable ...
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  • 59.9k
3 votes
Accepted

Can a regular multimeter measure voltages in 400Hz range?

The Unit-T UT33C user's manual says it can handle AC up to 400Hz and 500V. It can probably manage the 400Hz (if it meets its specifications.) It will give totally wrong results for the 1110Hz - ...
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  • 59.9k
1 vote

Transistor parameter in Proteus

You have a few options here. You can either select a transistor with the desired values, or if you really want to do it with a generic BJT, double click the part to bring up the Edit Component page. ...
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  • 11.5k
5 votes
Accepted

Is it realistic to analyze the bare components / ICs of circuit boards to understand how they work?

Learning from circuit boards can be helpful if you have nothing else, its how many of us get started, but certainly not optimal. If you spent the same amount time/energy deciphering a textbook you ...
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0 votes
Accepted

Does an ASIC have an instruction set?

I know this is going to sound like a reductive statement, but the control is done in an application-specific way, so a generic answer is hard to write here. Instead, I'll give some basic background ...
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  • 14.5k
1 vote

Unknown part on WiFi switch

It appears to be a Bright Power Semiconductor buck regulator — maybe a discontinued or not-listed part, given that it doesn't appear on their site and datasheets can't be found, but there are several ...
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  • 4,865
2 votes

DC signal to Integrated signal for analog filter circuit

Just so we are clear... you will need a rectifier, otherwise an integrator will yield the average of the signal and you will get zero. Use a precision full wave rectifier. Source: https://...
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  • 64.6k
5 votes

Identify this chip is on a Dell OptiPlex 745 motherboard

Probably this guy’s bigger brother, or that first 8 is actually a 6. Can you take a photo from a different angle and zoom out a bit? Datasheet FAN5068 is a voltage regulator for DDR memory. FAN5088 ...
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  • 9,298
0 votes
Accepted

External load capacitors on 32.768 kHz crystal oscillators

The crystals offered by the manufacturer mentioned can be specified with different \$C_L\$ - if you want the "6 pf" version, the part # would start: ABS05 – 32.768 kHz-6... Very often, the ...
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  • 18.9k
1 vote

External load capacitors on 32.768 kHz crystal oscillators

I do not understand why the crystal oscillators require external capacitors Without capacitors, the crystal will oscillate at an inaccurate frequency or may not oscillate at all. With too much ...
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  • 390k
2 votes

Motor Controller Cloning Service?

...they do provide a lot of information and pictures on their release page. How feasible is it that someone could look at their design, layout all the same components, and send that information to a ...
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  • 52.2k

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