Questions tagged [oscillator]
A device or circuit that generates an AC signal at a certain frequency.
2,061 questions
-2 votes
2 answers
98 views
0 votes
2 answers
144 views
How do I convert a VCXO with 4.7625v output level to LVCMOS?
I am using a Crystek CVHD-950 osc to generate a 122.88MHz sinewave. I need to feed it to an LVCMOS gate. I see two problems: Although I am supplying it with 3.3v it generates a 4.7625v signal The ...
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-1 votes
0 answers
95 views
How do I analyze this battery charger circuit
I took out this PCB from an old mobile battery charger and tried to create the circuit diagram. The image shown is the simplest diagram I could make from it still it is quite confusing to understand ...
1 vote
1 answer
70 views
When should an MOS varactor be used in place of a varactor diode?
I was reading about voltage controlled oscillators in this article. Towards the bottom of the article, the authors display this figure when discussing varactor diodes: I'd never heard of an MOS ...
- 57
3 votes
2 answers
127 views
Why does my Clapp oscillator with a varactor diode have this problem?
I am trying to make a voltage controlled Clapp oscillator but it seems to have this weird behavior I can't fix. And I don't understand why it has this issue. At low voltages for the varactors it seems ...
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3 votes
1 answer
106 views
Filtering of a 10kHz sine wave is not working
I am making an oscillator for a project i am working on. My problem is as follows: The output of the oscillator is 10kHz but the requirement of my oscillator is to have the second harmonic be 60 dB ...
1 vote
1 answer
116 views
How do I derive the exact frequency formula for this integrator + non-inverting Schmitt triangle/square oscillator?
I’m trying to understand (and derive) the frequency equation for the classic triangle/square function generator made from an inverting integrator driven by a non-inverting Schmitt trigger. The ...
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7 votes
3 answers
711 views
Why does charging a capacitor lead the NPN transistor to turn off in this oscillator circuit?
I came across this circuit, and I still don't quite understand why the capacitor, when charged, leads the NPN transistor to turn off? Isn't the base still at a higher voltage than the emitter, and ...
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2 votes
1 answer
270 views
Relaxation oscillator giving distorted square wave
The relaxation oscillator I built using two TL071CP op amps gives a distorted square wave for frequencies above 10Hz. For frequencies up to 10 Hz the square wave is solid after which the top peaks ...
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1 vote
0 answers
81 views
RF interference from Schmitt oscillator?
Background I'm using a force-sensitive resistor (Interlink FSR 408, standard 610mm model) as a bed presence sensor in each of my kids' bunks as part of a LED strip project. I'm measuring resistance ...
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2 votes
2 answers
231 views
Crystal quartz oscillator is it good for amplitude modulation?
I am in need of a sine wave generator for a AM modulator I am building.The carrier signal of my AM modulator will be at 10MHz.I searched through the internet and found a circuit on https://www....
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0 votes
0 answers
80 views
Mathematical Derivation of the √(2N) Factor in RC Phase-Shift Oscillators
I am studying the RC phase-shift oscillator with stages. In several references, the oscillation frequency is often given as \$ f_0 \approx \frac{1}{2\pi RC \sqrt{2N}}, \qquad \omega_0 = \frac{1}{RC \...
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6 votes
3 answers
889 views
What is the purpose of pulling up the output of a comparator to VCC? [duplicate]
Newbie here. I don't understand the purpose of resistor R3 here after the output of the square wave oscillator. Can someone explain? Thanks!
3 votes
3 answers
690 views
How does the firing of a spark gap in a Tesla coil convert the open primary circuit to an LC oscillator?
According to my understanding, in this type of design, when the spark gap fires, the circuit closes and the primary circuit should act as an LC oscillator. However, the ends of the primary capacitor ...
0 votes
1 answer
81 views
How should one evaluate a 100MHz antenna connected to a 25MHz oscillator circuit?
A radio oscillator circuit is composed of quartz and various other recognized components. For instance, when a 25MHz quartz crystal is oscillating, it is indeed a passive component that requires an ...
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