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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..
Astable Oscillator Circuits
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Pierce Oscillator Circuits
255W Valve RF Transmitter circuit
This transmitter of 255W is depended on the coils we put at it to work in both the middle and the short waves. The power in the antenna is 255W and includes 4 states. The first consists of the EF80 that works as a COLLPITS CLAPP oscillator. Frequency selection is done in a somewhat unusual way: Instead of the variable capacitor, it uses a...
Arduino DAC Signal Generator project
Once the circuit gets current, all variables are initialized and the loop function is continually running. Initially all LEDs are off and there is no signal at the output. By pressing the signal switch, the first light that shows the most signal is at the output and the D0-D7 terminals give the appropriate signal which, when passing from the...
Recording circuit of phone conversations using PC
This circuit is used to record telephone conversations on your landline telephone. All you will need is this small circuit and subscription of your PC. There are few times when we forget what we said or told us. So we need recording. Sometime, not many years ago, recording of this kind of conversation was done with a small tape recorder. The...
FM Micro-Transmitter Bug Surveillance Circuit
The transmitter we recommend to build is quite simple. It can even be built by a beginner. However, unlike the ease of construction and its small size, it is almost certain that it will impress you with its outstanding performance. Its autonomy is 12-15 hours, with a 9 volt battery and its range is from 100 to 300 meters depending on the...
Construction of 50Watt 8Ω two-way Hi-Fi Speakers
The presented speakers are distinguished for their small dimensions and their extraordinary sound. Our home space is often limited and prohibitive for large speakers. This limitation does not mean that we will stay without high Sound Quality. Its design is simple, low cost and is easy to construct. Speaker types are too many and are designed in...
GSM modem circuit with Wavecom WMOi3
Modems are devices that connect either remote devices to a computer, or two or more computers to each other. Their connection is usually wired. The GSM modem we present is wireless. It can connect two computers, a computer with the internet or even be the central unit for a data acquisition system. Generally the construction is a GSM phone...
1W UHF Linear Amplifier with BLW33
This circuit is an amplifier for small transmitters operating in the UHF band, specifically in the 450-800MHz range. The amplifier works in class A and we used the well-known Philips BLW33 transistor for its manufacture. The construction, although simple, can be said to be quite critical due to the high frequency singularity. To achieve this, a...
8W Amplifier with TDA2003 circuit
Many times a small amplifier is needed to meet the needs of small spaces. This amplifier can be either mono or stereo, with this circuitry you can comfortably drive two small speakers. To build the amplifier you do not need anything but a few materials and a small power supply. The power of the amplifier, although low power, will solve many...
FM Linear Amplifier 400mW
This amplifier is intended for amplifying low signals from oscillators in the FM band. It does not have frequency regulators with variable capacitors and coils, it has a wide range and moderate power capable of driving several linear amplifiers. The whole construction is based on the two low-power 2N4427 transistors, which are designed for the...
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