The push-pull tag has no usage guidance.
0
votes
2answers
39 views
Opto-coupled PWM output
I have a circuit with two different ground levels. Using a optocoupler, I want to translate a PWM signal to the new ground level.
Does there exist a easier method than the following? (Ideally with ...
2
votes
1answer
68 views
Confused between push-pull and open-drain
I am planning to use i2c based port expander (earlier I was using atmega328P's GPIO) for inputs and outputs. On a digikey search, I found MCP23008, MCP23009 and MCP23017 as possible replacements. Out ...
3
votes
2answers
59 views
Must both transistors in a class AB amplifier push-pull pair need to be matched?
A in push pull pair the emitter of the two transistors are connected together. Therefore, what difference would it make if they are not matched vs if they are matched i.e they have same beta value.
0
votes
1answer
92 views
STM32F103 GPIO and wrong configurations
I have a few questions about gpio.
First
What if two push-pull pins with high level connected? My point of view is that there is no way for current and nothing bad will happen. And reading of pin ...
1
vote
1answer
79 views
Push-pull configuration over single mosfet
I'm dealing with a simple application in which I need to drive a pure resistive load and to control it by voltage. I control the load through a pwm signal coming from a microcontroller in 5V logic. ...
1
vote
1answer
102 views
Push pull CMOS output stage overcoming the distortion problem
I implemented the simple push pull source follower and I understand that it has this distortion problem. That is between -|VTP| ≤ Vin ≤ VTN there is no output because the output terminal floats since ...
1
vote
4answers
96 views
Input pins hardware interface uC
I am trying to figure out how to interface a A2235-H GPS module.
The datasheet says that one pin(nRST) must be connected to open collector or open drain output of uC while an other one(ON_OFF) must ...
0
votes
1answer
80 views
Is this push pull amplifier wrong?
Under the following tutorial:
http://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/biasing-techniques-bjt/
They explain push pull operation. But should't negative terminal be separate with ...
0
votes
2answers
127 views
Ability to push and pull objects (theory)
So, I do not know much about electricty but it has always been interesting to me. (Especially solar cells) but negative is attracted to postive, etc.
So couldn't you theoretically have an "object" in ...
0
votes
0answers
48 views
Unable to determine why clock signal is being pulled down
I have a clock signal coming out of an SPI source. This source has an output resistance of 400 ohms at 8MHz which was measured and output voltage of 1.9V peak-to-peak. The clock signal travels to a ...
2
votes
3answers
392 views
Push pull core saturation
I want to build a circuit similar to this one:
I read that using push pull without per-pulse current limit or series with trafo cap can cause core to saturate because two pulses aren't perfectly ...
0
votes
2answers
128 views
Understanding the Kraakdoos Opamp circuit
I'm trying to better understand the layout below. Which is based on a project called "Kraakdoos" [2] which is a touch based musical instrument. And sources suggest that it uses "‘malformed’ ...
3
votes
1answer
230 views
Problem with a class AB amp
I have a simple preamp circuit coupled with a class AB power amp. The design is quite simple and I am pretty sure I already made it work a couple of years ago.
simulate this circuit – ...
0
votes
1answer
770 views
How to determine current limiting resistor values for push pull amplifier driven by op amp?
I'm looking to increase the output current drive of a high voltage op amp using a push pull amplifier. The OPA454 datasheet includes an application circuit to do exactly this, and includes some ...
1
vote
1answer
122 views
Push-pull Amplifier Class AB
I am new to electronics and I am trying to build an audio amplifier with an input signal of 100mV @ 60 hz using 12V as VCC and expect an output of 70-75W power.
I have the following circuit:
I ...
5
votes
3answers
371 views
Audio Amp-Calculate Current gain of a Push-Pull BJT Pair (and remove Beta Dependence)
I was designing an audio amp for a final project for an electronics course. We were given a very vague set of requirements and told almost nothing about our input signals or desired output minus ...
2
votes
2answers
552 views
What use is a pull-up/pull-down with a push-pull output?
For at least some STM32F4 MCUs, push-pull + pull-up/pull-down is a valid GPIO configuration, but what would you ever use it for, and why? I assume there's some saner reason than "I just really felt I ...
-2
votes
1answer
155 views
Where i can select and buy ferrite toroid core for SMPS? [closed]
I made push-pull smps working on 50 khz. It has up to 90-120w power (input voltage 12v and output 24v). For transformer i am using two ferrite toroids on top of each other, it's a old USSR toroids ...
8
votes
4answers
2k views
What is a push-up/pull-up resistor? [duplicate]
A.S. The question A question on pull up resistors answers only a part of my question as already mentioned in "EDIT" made shortly after this question was asked & answers here (below) are much ...
1
vote
1answer
201 views
Is this transistor configuration considered “Push-Pull”?
I have read that the output stages of some operational amplifiers use push-pull transistor configurations. I was looking over the datasheet for the LM741 and was wondering if this was one of those ...
0
votes
0answers
66 views
How much resistance should a pull resistor include? [closed]
How much pull to ground resistance do I need?
Is the amount you need variable?
How did you figure this out? (Where can I learn too)
Any references I should look to?
So sorry for my large host of ...
3
votes
3answers
3k views
How to read a push-pull output
I recently came across a sensor that had a "push-pull" output. I can't find anywhere how to read such an output:
Is it some particular kind of analog output?
I would want to read it with the ...
-1
votes
1answer
597 views
2n3904/2n3906 driving mosfet gate
I'm building a MOSFET driver like this. The signal source is 7V peak-to-peak. Vcc is 12V. The push-pull stage is 2n3904/2n3906.
I've tested the push-pull output before adding the transformer, and ...
0
votes
1answer
343 views
A question about a Class E Tesla Coil circuit
The link to the original website and the schematics :
http://uzzors2k.4hv.org/index.php?page=4MHzclassE1
http://uzzors2k.4hv.org/projectfiles/4MHzclassE1/proper_4MHz_classE_SSTC.gif
I'm trying to ...
