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Results tagged with oscillator
Search options questions only
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user 142915
A device or circuit that generates an AC signal at a certain frequency.
3
votes
1
answer
2k
views
Astable multivibrator diode improvement
The output voltage of an astable multivibrator is not a perfect square wave; the voltage when viewed from an oscilloscope tends to resemble a curve. I'm told that this is because the voltage across …
- 3,247
1
vote
1
answer
1k
views
Why is my LC circuit resonant frequency way off?
I'm very new to oscillators but very keen to learn more so I connected this very simple circuit:
where the voltage source is my signal generators and I have an oscilloscope connected across the cap …
- 3,247
3
votes
4
answers
3k
views
Colpitts oscillator: emitter resistor
I'm experimenting with the Colpitts oscillator, configured in the common base topology. …
- 3,247
3
votes
1
answer
177
views
How is oscillation condition fulfilled in this oscillator circuit?
I'm rather curious as to how oscillating conditions are achieved in this oscillator. My attempt at an analysis follows.
The BJT is operating in common base mode. …
- 3,247
1
vote
2
answers
196
views
Low-impedance tap in this oscillator circuit
It seems to be quite close to a regular feedback oscillator, with a few peculiarities. …
- 3,247
2
votes
3
answers
2k
views
Why do the center tapped capacitors in Colpitts oscillator give an inversion?
In Colpitts oscillator, we have two capacitors in series, with the middle grounded. …
- 3,247
3
votes
3
answers
6k
views
Help needed in understanding this LED chaser circuit
Here is a circuit called LED chaser that I found the other day. I watched some videos on Youtube and saw that its function is to blink the LEDs in some kind of sequence:
https://www.youtube.com/wat …
- 3,247
5
votes
3
answers
4k
views
What actually is the load capacitance of a quartz crystal?
I'm having hard time understanding the principles of piezoelectric crystal oscillators.
I've found this picture:
I understand that "load capacitance" is something you have to connect to a crystal. …
- 3,247
3
votes
6
answers
4k
views
Confusing quartz crystal impedance graphs
Here is a picture of a crystal oscillator in both series and parallel mode:
On the left, there is an oscillator with the crystal in series mode. … So why doesn't the oscillator oscillate at these frequencies? …
- 3,247
1
vote
2
answers
3k
views
Understanding the Michigan Mighty Mite
I'm quite interested in this rather simple transmitter design called the Michigan Mighty Mite, described here:
https://makerf.com/posts/mighty_simple_shortwave_transmitter
I'm familiar with resonant …
- 3,247