264 Threads found on edaboard.com: Oscillator Transistor
Ring oscillators aren't going to be naturally frequency-
linear in any case, and less so as you slide across the
low end where current is exponential w/ VIN (worse
than square-law at the big end). You probably need
to make the bias scheme more elaborate, with current
being the function of control voltage which makes the
linear-frequency result (may
Analog Circuit Design :: 01-14-2017 00:16 :: dick_freebird :: Replies: 13 :: Views: 802
Why don't you get a 150Mhz crystal and create a transistor oscillator.
Than it will be Sine wave.
Elementary Electronic Questions :: 01-01-2017 22:02 :: chemelec :: Replies: 15 :: Views: 1149
You oscillator is pulled by simple transistor mixer and its frequency/amplitude is shifted by modulating signal.Any matching circuit is not necessary @ 1MHz but you should evaluate your circuit with elegant circuits such as double balanced mixer.Or you can isolate your oscillator by adding an extra buffer circuit.Meanwhile, your (...)
RF, Microwave, Antennas and Optics :: 12-31-2016 05:16 :: BigBoss :: Replies: 6 :: Views: 711
Almost all superhet receivers use single transistor oscillator/mixer stages to produce IF ready for filtering and amplification so just about every radio you have seen uses that principle!
The design in your diagram appears to be just a modulated oscillator, I'm guessing to run at around 800 - 1000 MHz. As it has no reasonable output point (...)
RF, Microwave, Antennas and Optics :: 12-25-2016 15:16 :: betwixt :: Replies: 5 :: Views: 612
I understand it's just an oscillator without power amplifier on output.
It's actually two oscillators, T1 is generating the 5.5 MHz audio subcarrier.
BF244 can probably work with circuit modifications, but why not use a 1 - 5 GHz fT small signal RF transistor?
Analog Circuit Design :: 11-23-2016 07:54 :: FvM :: Replies: 5 :: Views: 975
I want to design crystal oscillator (pierce) but i have in trouble...
Proposed oscillation frequency is around 39MHz
And i used crystal
L~4mH C~4.1fF R~10ohm Co~2pF
C1 C2=20pF(shunt cap for drain to gnd& gate to gnd)
Feedback resistor ~ 1Mohm
However, my oscillator input/output settles
to same (...)
Analog Circuit Design :: 10-12-2016 15:23 :: YUJIN :: Replies: 0 :: Views: 3
cross coupled of two transistor will give negaive impedance therefore negative gm, or transconductance.
it will compensate for loss of inductor and resistor therefore commonly used in oscillator design.
now why the same configuration used in a latch or storage element?
so, you want the same type of oscillation happen in a latch?
Analog Circuit Design :: 08-05-2016 16:53 :: sys_eng :: Replies: 1 :: Views: 393
The circuit is one way to make a blocking oscillator. A capacitor is not needed. The 1k base resistor reduces the base current to a low amount so it can work from a 1.5V battery. If a 5V power supply is used then the resistor value must be increased 5V/1.5V= 3.33 times to prevent burning out the transistor.
Learn about the turns ratio of a transfo
Hobby Circuits and Small Projects Problems :: 07-28-2016 03:54 :: Audioguru :: Replies: 14 :: Views: 1704
Brief explanation of the phase shift oscillator operation principle in this Wikipedia article
Analog Circuit Design :: 06-22-2016 14:38 :: FvM :: Replies: 9 :: Views: 566
It will be both educative and entertainment to design a transistor oscillator with a hand made low power transformer - the voltage can be high but the current can be low (must be very low) and you will not get a shock. Transformers (most of them) do not have cancer causing parts/ elements and they can be very small because they will not be handling
Power Electronics :: 06-14-2016 17:35 :: c_mitra :: Replies: 6 :: Views: 566
I am following RF design book and tutorials on negative resistance oscillator, but encounter some problems.
My design is 5GHz oscillator. I want to use single device, so i decided to use NE3210S01, it has very high gain, there are many papers with push-push, etc. oscillators, where NE3210S01 fundamental oscillation is at 3...9 GHz. My (...)
RF, Microwave, Antennas and Optics :: 05-06-2016 03:21 :: Terminator3 :: Replies: 9 :: Views: 945
You do not have a piezo buzzer. Instead you have a piezo transducer (a piezo speaker). A piezo buzzer has a built-in transistor oscillator to make it beeeeep when a DC voltage powers it. A piezo transducer is attached to a metal plate and it expands which causes the assembly to bend in one direction when voltage is applied and it bends in the other
Elementary Electronic Questions :: 03-15-2016 15:06 :: Audioguru :: Replies: 8 :: Views: 815
Hello so I have two circuit one is a colpits oscillator with a 13.56mhz crystal and the other is a 10watt Continuous Wave amplifier and I'm trying to do the impedance match between the two.
I have a L1 reactance of 450 ohm with 36 turns and I'm trying to drive that to the input of my amplifier circuit with a 50ohm input do thi
RF, Microwave, Antennas and Optics :: 03-08-2016 03:37 :: musclemania05 :: Replies: 5 :: Views: 978
You do not have an oscillator because there is no transistor or opamp to keep it going. Instead you have an LC that rings like a tapped bell.
The pulse activates it with power causing it to ring for a moment if the power is applied through a series resistor, then it rings again for a moment when the power is disconnected. It can feed an amplifier
Elementary Electronic Questions :: 02-08-2016 16:11 :: Audioguru :: Replies: 10 :: Views: 912
I wish to design a ring oscillator of 250 Hz (without using inductors and capacitors ) with two differential outputs. But the phase difference between the two outputs should be exactly 180 degrees. Also I need the output DC to be 900mV. I am using 1.8V supply voltage.
Can anyone suggest me some paper for the same??
Analog Circuit Design :: 01-20-2016 07:17 :: pankaj jha :: Replies: 1 :: Views: 436
Apart from reasonability of this application, you need a resonant oscillator circuit to suppress possible fundamental wave oscillations.
Analog Circuit Design :: 01-08-2016 16:23 :: FvM :: Replies: 10 :: Views: 750
Sounds like you have build a nice oscillator with the segment or digit driver transistors. Long PCB traces are a prerequisite to make it oscillating. There's a problem in your circuit, not directly related to the "ringing" problem which should be fixed first. The npn transistor segment drivers are only partly turned on by the 3.3V base (...)
Professional Hardware and Electronics Design :: 12-25-2015 08:45 :: FvM :: Replies: 13 :: Views: 1215
good luck. finding a new transistor to fit into an existing oscillator circuit, especially one with very special transistor parasitic capacitance requirements, sounds like a nice project for the winter. warm up your soldering iron, you will need it.
RF, Microwave, Antennas and Optics :: 12-15-2015 10:35 :: biff44 :: Replies: 8 :: Views: 1164
As this component is part of an oscillator/driver (frequency not given). Its either a part or is the Vcc stabiliser circuit. Or if the driver is producing 10W of MF, it could be the actual RF output device.
As you have removed the device, power the unit up and check on the connections which went to the device. If you find 10V of RF on one, it g
Analog Circuit Design :: 11-02-2015 09:28 :: chuckey :: Replies: 14 :: Views: 999
Normally you want the buffer to draw only minimal power from the oscillator.
The aim is to avoid loading the oscillator.
RF, Microwave, Antennas and Optics :: 10-28-2015 20:14 :: BradtheRad :: Replies: 2 :: Views: 964