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Results tagged with oscillator
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user 50500
A device or circuit that generates an AC signal at a certain frequency.
4
votes
1
answer
3k
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Colpitts Oscillator Current and Frequency
I built a transistor based Colpitts Oscillator and I've been confused by the difference between the standard formulas and circuit behaviour (both real and simulated). …
- 1,696
1
vote
2
answers
384
views
Intuitive meaning of setting determinant = 0 in oscillator analysis
Given the following generic FET tuned oscillator arrangement:
and the corresponding system of equations determined by mesh/loop analysis:
The determinant is obtained:
The author then comments that …
- 1,696
5
votes
2
answers
3k
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Understanding the Pierce oscillator pi network
I've been looking at the Pierce oscillator and I'm unsure of the role played by the series caps to ground (the so-called pi network). …
- 1,696
4
votes
1
answer
3k
views
How Exactly Does a Push-pull Pair Cancel Even Harmonics?
I've been studying cassette tape circuits recently and the same bias oscillator circuit keeps cropping up time and again. …
- 1,696
4
votes
4
answers
2k
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What's the purpose of the diode at the JFET gate in this Hartley oscillator?
This is something of a follow-up question to one I asked a few days back (Original JFET Hartley Question). Having made the changes suggested in the comments (i.e., changing Rd/R3 to 270 ohms, instead …
- 1,696
3
votes
2
answers
757
views
Why won't my JFET Hartley oscillate
I built this Hartley oscillator (taken from the November 1990 edition of Popular Electronics) as part of an AM modulated signal generator project. But, it steadfastly refused to oscillate. …
- 1,696
4
votes
1
answer
2k
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Transistor Based Wien Bridge Oscillator
The circuit contains an AC source to drive the bridge which is basically a JFET Wien Bridge oscillator with selectable oscillation frequencies. …
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1
vote
1
answer
1k
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Effect of Small and Large Signal Transconductance on the Colpitts Oscillator
I've been following Ron Quan's book: Build Your Own Transistor Radios and I've come to the section where Ron is analyzing the oscillator circuits used in his designs. … In particular, he discusses the effect of large-signal transconductance (big Gm) on the Colpitts oscillator and sums up nicely why you get distortion with large signals (because the resistance to the fundamental …
- 1,696
2
votes
2
answers
1k
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Questions Regarding Metal Detector Tx Coil Circuit
The following circuit is the transmit coil of an IB metal detector. I recognize most of this: an op amp astable with a CE push-pull output stage driving a resonant circuit. But, I have questions.
…
- 1,696
2
votes
1
answer
453
views
Transfer function and frequency of common drain Colpitts with ballast coil
By my calculation, this oscillator should be oscillating at a frequency of about 77 kHz. Instead it oscillates at 300 kHz. …
- 1,696
0
votes
1
answer
225
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Derivation of LC impedance transformation formula
I've been studying wideband LC oscillators recently and my search for an amplitude stabilized configuration led me to the Vackar Oscillator (wiki).
This document (published in 1949!) … "LC Oscillators and their Frequency Stability" describes the circuit and I've been studying his analysis of a generic LC oscillator presented in the first few pages. …
- 1,696
0
votes
1
answer
483
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What is the purpose of this RF sweep oscillator circuit section
Wavetek 1067 User Manual - Circuit diagram on pg.73
Here's an annotated snippet from the main sweep oscillator board:
I'm guessing that section B (Blue box) is the main sweep oscillator with L8 - L10 …
- 1,696
1
vote
2
answers
749
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Measuring Vackar Oscillator Output Amplitude and High Frequency Effects
At the end of the day, I'm trying to estimate the output amplitude of this oscillator and I'm not having much luck. … Does anyone know of a straightforward way of computing the amplitude of this oscillator that doesn't involve simulation? …
- 1,696
1
vote
0
answers
542
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Clamp-biasing at JFET Gate in RF Circuits
One circuit I built that springs to mind is the G3PDM Vackar:
UPDATE:
I wanted to be accurate in my assertion that I hadn't noticed any significant clamping, so I rebuilt the Vackar oscillator and made …
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