Colpitts Oscillator Circuits
Colpitts Oscillator Circuits
Colpitts harmonic oscillator 100Mhz
L1C1 are selected to be resonant at a frequency below the desired crystal harmonic but above the crystal"s next lower odd harmonic. C2 should have a value of 30-70 pF, independent of the oscillation frequency. There is no requirement for any specific ratio of C1/C2, but practical harmonic circuits seem to work best when Cl is approximately 1-3...
High frequency signal generator
A tapped-coil Colpitis oscillator is used at Ql to provide four tuning ranges from 1.7 to 3.131Hz, 3.0 to 5.6 MHz, 5.0 to 12 MHz and 11.5 to 31 MHz. A Zener diode (D2) is used at Ql to lower the operating voltage of the oscillator. A small value capacitor is used at C5 to ensure light coupling to the tuned circuit. Q2 is a source-follower buffer...
Twin Cristal VXO
This is an image Schematic. No Description available.
A Colpitts VCO for Wideband (0.952.15 GHz)
Modern set-top DBS TV tuners require high performance, broadband voltage control oscillator (VCO) designs at a competitive cost.To meet these goals, design engineers are challenged to create high performance, low-cost VCOs.
Colpitts oscillator for the UHF range
Simplified circuit diagram of the two-stage Colpitts oscillator. In comparison with the classical single-transistor Colpitts oscillator [1,2,5] the two-stage modification includes an extra transistor Q2 and an extra capacitor C3. We note that both transistors, Q1 and Q2 in respect of AC signals are in a common-base configuration.
Colpitts oscillator FM transmitter
Its frequency depends on the capacitance of the vary cap diode. The center frequency is changed by varying the biasing voltage of the vary cap through the 47K pot. You can use a 75cm telescopic antenna or simply a length of hook-up wire. Mine worked fine with a 6cm hook-up wire and gave a range of 100m with a good FM receiver.
Comparison between Hartley and Colpitts oscillator
NPN Colpitts oscillator base coil
NPN Colpitts oscillator collector coil
Broadband Colpitts VCO for TV Tuner
The high performance of modern set-top DBS TV tuners require broadband voltage control oscillator (VCO) designs at a competitive cost. To realize these goals, design engineers are challenged to create high performance, low-cost VCOs. The traditional design of Colpitts oscillator is used for many VCO applications. Designing a broadband Colpitts...
Simple 50 to 300 MHz Colpitts Oscillator
Simple high efficiency Colpitts oscillator. In the higher frequency ranges, above 50 MHz, Colpitts oscillators are used because stray circuit capacitance will be in parallel with desired feedback capacitance and not cause undesirable spurious resonances that might occur with the tapped coil Hartley design. The FM VCO shown is a grounded base desig
op amp Op Amp based Colpitts oscillator
An op-amp based Colpitts oscillator in multisim. When I press run button it shows- "timestep too smaall error". I`ve googled and tried everything but it still shows the error. Not sure where you got that design, but as drawn your C-L-C pi circuit is grounded (by an ideal ground, for purposes of simulation) at both ends, so it willhave absolutely...
Early schematic of a Colpitts circuit, using a vacuum tube, redrawn from the patent publication. A Colpitts oscillator, invented in 1920 by American engineer Edwin H. Colpitts, is one of a number of designs for electron..
Common Collector Colpitts Oscillator
Design a Colpitts Oscillator in a common collector configuration using a single BJT. Provide base current to get the transistor operating properly, and you can do this using a potential divider (between Vcc and gnd): use resistor values as high as possible (bearing in mind the loading effect of the base current) in order not to load the LC...
colpitts crystal oscillator circuit
This is a design schematic of a Crystal Colpitts oscillator can be implemented using a transistor and a parallel mode crystal. This is the figure of the circuit. In this circuit, the crystal is use as an inductance. A large value capacitive divider is used between gate, source, and ground, and a small series capacitor is placed in the crystal circ
17 colpitts ham lesson
The oscillator model I talked about in the introduction to oscillators was as simple as it gets - capacitor + inductor. So I wanted to try to make my own oscillator. In a search for how to make an oscillator I got a website with a few different kinds. They look pretty simple schematically, but I like to know how the charge is travelling thro
Edwin Henry Colpitts was a communications pioneer best known for his invention of the Colpitts oscillator. As research branch chief for Western Electric in the early 1900s, he and scientists under his direction achieved significant advances in the development of oscillators and vacuum tube. An electronic oscillator is an electronic circuit that pr
Parallel fed Colpits oscillator circuit
It is parallel fed because the DC plate current does not flow through the inductor. R3 may be replaced by an RF choke if desired. C3 keeps B+ from appearing across the variable capacitor which is generally a no no. If R1 were not present, C3 might not charge up and there would be B+ on the variable capacitor anyway. R1 makes sure that the...
Answer to Consider the Colpitts oscillator in Figure P15.86. The capacitors andare very large bypass and coupling capacitors. Let..
Colpitts oscillator using transistor. Circuit diagram and theory
Colpitts oscillator circuit diagram and theory. Colpitts oscillator frequency equation. Colpitts oscillator using transistor. Colpitts oscillator using opamp..
Ultra Low Voltage Nanopower Lc (colpitts) Oscillator Circuit
two Colpitts oscillators
Hello, I have queastion about type of the osclator I found on wikipedia here: File:NPN Colpitts oscillator collector coil.png - Wikipedia, the free..
Colpitts oscillator formula
FET Colpitts Oscillator (Microwave)
Hi there. I`ve building a 430Mhz Transmitter for microwave. And for some strange reason i couldn`t get any output frequency from my circuit. I`ve..
Questions about colpitts oscillator design
amplifier input and output impedance, load and source resistance are strongly mutually dependent in the CC circuit. That`s a reason, why "impedance matching" doesn`t achieve results representative for the circuit operation. Analyzing the circuit as CB with virtual ground, as suggested by LvW, gives a better decoupling of both amplifier ports. Impe
AmpOP Colpitts Oscilator simulation
Hello, I`m trying to simulate a 10MHz Colpitts Oscillator using an OPAMP, but i`m not getting the expected outcome, the frequency is not 10MHz and the ..
Colpitts Oscillator Calculator
Colpitts oscillator circuit is shown in Figure 1, Q is the transistor. The Colpitts and Hartley oscillator circuit are similar, except the inductor, capacitor exchange of positions. Oscillator equivalent circuit shown in Figure 2. Capacitors C1, C2, and inductor L form a positive feedback network of selected frequency, feedback signals from both e
fm transmitter colpitt oscillator
C1 takes the DC decoupled voltage from the Microphone, amplifies this via Q1, C2 decouples it again, then R6 and C3 Low Pass Filter it, but once we get to Q2, Secondly how does this circut actually accomplish frequency modulation: Please use math on me! (I know that it should change the delta F term in the equation cos(2*pi*fc*t + F) to achieve...
colpitts osc not working
I`m afraid the circuit you have there is nowhere near correct. For a start, there is no DC path to the transistor base, so no base bias current is available. Q1 collector and emitter are connected directly to the battery with no intervening impedance, so the transistor cannot deliver any useful output. Hmm. ok. so how do I figure out what R1, R2,
COLPITTS 1 To 20 MHz Crystal Oscillator
Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit This is a simple Colpitts crystal oscillator for 1 to 20 MHz, PARTS..
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Low Cost Pulse Generator circuit
This pulse generator produces square pulses from 1Hz to 100KHz with adjustable pulse width of nearly 0-100%. The generator is powered with a voltage of 5-15V and is therefore suitable for both TTL and CMOS circuits. If you want to measure the response of an amplifier or give timing pulses to a variable frequency digital circuit or drive a pulse...
Key Code Combination High Security Door Lock
This project is an electronic lock with many combinations that you can easily change and opens only with the correct combination of four consecutive numbers. The big advantage of the electronic lock is that the four numbers must be entered in the correct order one after the other. If a number is wrong then the circuit automatically resets to its...
Induction Balance Gold Metal Detector Circuit
This circuit really is the simplest inducer balancing metal detector (IB, Inductlon Balance) that can be built. The LB metal detection method has a satisfactory depth of penetration and good distinction between iron-based and noble metallic objects. Several metal detectors are available in the market, but their price is often prohibitive for...
Secret High Power Free Energy Circuit (AEC)
This is a Tesla/joule thief hybrid circuit that its inventor claim to produce 90 times the input power! The circuit can be self looped and can provide 1050W of power. from the 1050W only the 11.6W will loop back to supply the joule thief. If you remove the bridge rectifier and the C capacitor you can use the circuit with high frequency AC...
High Power Full Bridge Flyback Driver circuit
You need to find a reliable full bridge driver to drive your flyback transformer? Well, This is your final stop. There are many flyback drivers schematics out there, but most of them will not last for long. It is common known that famous ZVS invented by Vladmiro Mazilli, is the most reliable flyback driver as it uses the resonant zero voltage...
High Precision Digital Pulse Meter Circuit
This small device, intended primarily for modellers, allows an instant reading of the time I of a pulse in ms. It can, for example, measure the position of the servomotors, about 1 to about 2 ms, or make repetitive or non-pulsed measurements, such as closing or opening times of any instrument, parasitic abnormality. The diagram just describes...
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