Unanswered Questions
713 questions with no upvoted or accepted answers
7
votes
2
answers
273
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Phase shift near saturation mitigation in input stage amplifier -- How does this work, why does this work?
I'm trying to understand how this circuit works on the input stage to the 4192A Impedance Analyzer.
Apologies for the quality... this is the best scan I could find. The design is furnished with the ...
CommunityBot
- 1
4
votes
0
answers
105
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Active load role on this circuit and possible uses
simulate this circuit – Schematic created using CircuitLab
I came with this circuit to know how an active load can improve it, I still can't finish to understand the role of active loads. The ...
- 333
4
votes
0
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115
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I have a question about the datasheet for AD8330 VGA (variable gain amplifier)
I don't have much experience reading datasheets. I was reading the datasheet for AD8330 VGA. I did not understand what the difference is between VDBS and VMAG. Can someone elaborate on that?
It's ...
- 17.9k
4
votes
0
answers
743
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D-Class Amplifier Design Verification
I have an internship coming up working with comparators and amplifiers, so I wanted to take on a side project involving both of those components. Designing a D-Class amplifier seemed like a great way ...
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3
votes
0
answers
89
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Tips on Building An Analog VCO
I am attempting to build an analog VCO. Many of the resources I see online implement a 555 timer, but I am trying to avoid that, solely for the sake of learning how to do this in purely analog. Here ...
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3
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0
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97
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What is the easiest way to change the polarity of a transistor based simple amplifier?
I would like to amplify signals from a silicon photomultiplier, which is an array of many small avalanche photodiodes (APDs). When one or a few APDs get hit by a photon, a small current will flow ...
- 315
3
votes
0
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136
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An amplifier that can output 40..50 V at around 15 MHz
I'm trying to build something to amplify a signal to produce a 40 V output at 15 MHz.
I haven't been successful in finding an opamp that can both output at these voltages while also not dropping the ...
- 23.6k
3
votes
3
answers
3k
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Measuring RMS power output from audio amplifier channel
I am looking for a simple way for getting the RMS power output of an amplifier channel set to some arbitrary gain. I want this in order to find the maximum level I can safely set the amplifier at for ...
CommunityBot
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3
votes
0
answers
119
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Gain of single input differential amplifier
When performing the small signal analysis of the circuit shown below, with \$ V_{1} = V_{in} \$ and \$ V_{2} = 0 \$, and output taken from \$ V_{02}\$, I consider the small signal model for half of ...
- 33
3
votes
0
answers
119
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Calculating the gain of a specific transistor amplifier circuit
NOTE: There is an error in the drawing above — C1 should be connected to the emitter, not the collector.
Hi Electronics SE, hope this is the right place to ask this, if not I'll gladly take it ...
- 175k
3
votes
0
answers
752
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Connect speaker directly to Samsung Galaxy S6. Minimum impedance accepted
I want to connect an external (passive) speaker (3W/16 ohm) directly to my Samsung Galaxy S6 using the headphone jack. I want to do this on my bicycle using the smallest space possible. Connecting the ...
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3
votes
1
answer
2k
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Connect a vibration motor to a headphone jack
I would like to solve the following problem:
I have a a variometer-device for an RC plane. Its receiver has a standard 3.5 mm headphone jack that provides a beeping sounds to my headphones. I would ...
CommunityBot
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2
votes
0
answers
88
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Help me optimize common collector transistor amplifier for two quadrant LDO
I need some help with a circuit I can’t find much information online.
Basic function should be a LDO which can source and sink current. To make it a bit more challenging there are some further ...
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2
votes
0
answers
161
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Simulation of transimpedance amplifier in LTspice
I am trying to simulate a circuit that is presented in a research paper by Dr Behzad Razavi. I am using LTspice for the simulation (please see the attached image and netlist for the circuit).
I am ...
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2
votes
0
answers
197
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How to calculate an rf amplifier stage
I changed the LC tank of the circuit below for operation in the 2m ham radio band (144-146MHz, I'm a licenced Class A Ham). Now I'd like to add an amplifier stage to increase the output by about 30dB.
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