Here is a CMOS two stage amplifier. As you can see there is no decoupling capacitor at all. Also I don’t see decoupling capacitors that are used in CMOS integrated circuits. Could you explain why? Thank you for help.
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Why there is no decoupling capacitors in analog IC
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I want to use many parallel LEDs. Can this IC (BP3309) help me to control them? [closed]
I want to use many parallel LEDs. Can the BP3309 IC
(datasheet in Chinese)
help me to control the LEDs? I want consistent brightness.
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Designed an electronic circuit using APR33A3. Not working [closed]
Designed an electronic circuit using Datasheet of APR33A3. It doesn’t work.
Checked the connectivity between component and it seemed fine.
- I have given a 5V DC supply
- Using an electret microphone
- 8ohm impedance speaker
Looking for suggestions
Link to the datasheet http://www.mycomkits.com/reference/aPR33Ax_C2.1_Datasheet_2130219.pdf
Link to the video of circuit made by me
https://www.youtube.com/watch?v=I2_Uu9zhqMg
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8 bit adder with 2 CLA
I need to make an 8 bit adder with 2 4-bit look ahead adders.I spent a lot of time reading about it and I think I get the gist of how it works, but I can’t seem to get this. I spent a lot of time thinking about it and am stuck.
So from the picture, at the end of a 4 bit cla, a generate and propagate is sent out and I assume that I need to somehow connect it to the first C in the second cla(looks like c1 in the pic; basically, first C input). I don’t know if that’s correct and if it is, I don’t know how I should do it. Am I supposed to use some sort of MUX gate? A diagram would really be appreciated.
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Unidirectional motor control
I am interested in controlling the speed of multiple small DC motors that will draw at most 1 amp each. I only need to run them in one direction, so an H-bridge IC like the SN54410 seems like the wrong choice. However, for my application, weight is a premium, and the SN54410 is the lightest method (per motor) for controlling motor speed I have found.
When I have looked into using individual transistors, they all seem to require a heat sink (either an external one or a metal back), which makes them heavier than the SN54410. In fact, I don’t understand how the SN54410 is able to drive two motors at 1 amp each without a heat sink (but it does). Can someone suggest a good component for the job? I am hoping for either an IC that is designed for unidirectional motor control or a small (TO-92) transistor that could be used to control an individual motor at 1 amp.
EDIT: BTW, I am going to be using PWM to control the speed.
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CS5463 IC circuit issues
I am trying to use CS5463 for power measuring by circuit from 41 page of its datasheet.
The only difference is power supply part. Instead of powering IC from AC line I am using separate 5V DC supply and all grounds connects to DC ground.
When I am trying to connect this setup to AC supply all 1K Ri and Rv resistors are blowing. They are 1/8W resistors which should be enough.
Here is schematics 
I think the reason is used DC supply but can’t understand how it can cause this issue. I didn’t find any info about using separate supply with this IC.
Here is my own circuit and burnt resistors are highlighted blue. DC supply are generated from same AC source.
Does someone have experience with separated DC supply?
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How to connect a switch between a dc power supply and the vcc of any ic in proteus?
I want to insert a switch between a power supply and vcc of an ic in proteus. Since by default the ic’s are connected to power rail of the circuit. I tried it by first connecting a switch between a dc source and power terminal and then connected the vcc terminal of the ic to that power terminal( by right clicking the ic -> edit properties -> hidden pins -> gave my power terminal as net to which th vcc of ic would be connected, but it did not work!
All I want is to supply IC at my desired instants or intervals not continuously through power rails !
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How are ICs named?
To me, ICs never have names that hint to their uses. For example, this AND gate from TI is named SN74LVC1G08. But that tells me nothing about what it does.
Is there a naming process for ICs? And if so what is it?
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What's the peak voltage of the sawtooth generated by the ic SG3525 or UC3525? Does it depend on the Ct capacitor?
P.S. I need this information in order to make a closed-loop FlyBack CC-CC converter.
The Tm transfer function is related to the sawtooth peak voltage:
Thanks!
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What does a Schmitt Trigger inverter act as when unpowered?
I assumed that a Schmitt Trigger inverter would act as an open circuit when unpowered, but discovered today that this is not the case. What does a Schmitt Trigger inverter act as when unpowered? I’m using the 74HC14.
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MOSFET as a VCCS or an variable resistance
I am a bit confused. In saturation region, sometimes, an MOSFET is called voltage-controlled current source and sometimes it is called variable resistor where its resistance is controlled by the gate-source voltage.
Are the two concepts equivalent?
I meant MOSFET operates in saturation region not triode.
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Strange IC input leakage current
I am reading the datasheet of the HEF4894BT.
First I saw the input clamping current is rated at 10mA and than I saw the input leakage current would be 10mA, too.
I thought the input clamping current is the current at which the IC is getting damaged and the input leakage current is the current which normally flows if I apply 5V or 0V to the input pin.
So 10mA input leakage current is wrong (Typing error)?
I am also wondering about the big amount of the leakage current.
On other datasheets its normally much smaller.
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First Time Using Integrated Circuits
I am building a circuit for a custom application. I have an old Toyota truck, and I keep leaving the headlights on, because there is no warning buzzer!
I have designed a circuit that takes 3 inputs:
* Headlights on
* Driver’s door open
* Engine off
I want to build this using integrated circuits, and have it supply 12V to a piezo buzzer when the above 3 conditions are met. Here’s what I’m thinking:
Will this work? I studied electronics in college, but haven’t done anything with it since!
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Arduino/IC Picture Scanner [duplicate]
This question already has an answer here:
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How to program a microcontroller via USB using JTAG? [closed]
I have some hard time understanding JTAG for programming.
I have an mcu that can only be programmed via JTAG.
What are some easy chips to start with in order to program an mcu via JTAG? I suppose I d need a chip (mentionned in the previous sentence) in order to convert the serial data received via usb to the “JTAG-equivalent”?
I am trying to program this mcu: TM4C1294 cortex M4, which can only be programmed via JTAG.
EDIT: a lot of you guys are talking about an FTDI2232 chip. But how would you wire an FTDI chip to the mcu? I mean the ftdi chip does (as far as I know a conversion to TTL and that s it). So you would then have all your data on the TX and RX pins. But with JTAG you need a TDI,TDO, TCK and a TMS pin. So I think you need another chip to do the conversion. No?
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What is stc32ab IC
I have some stc32ab IC’s but I cannot find any information or datasheet for them.
Please give me some information and/or datasheet about this IC
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Circuit confusion help
Can someone help me understand this circuit. I’m confused how both 5v and 12v are connected to same transistor Q63. Is 5/12v flowing through the same circuit when it’s turned on? Or is Q63 simply connecting ground to both voltages?
Seems to be a part of this circuit here
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