285 Threads found on edaboard.com: Oscillating
I am trying to do two-band antenna and use inductor as selective network for frequency separation. And how to specify the natural resonance of the inductor with interturn capacitance, when it similar to parallel oscillating loop?
Thanks in advance.
Electromagnetic Design and Simulation :: 03-30-2017 15:41 :: antp :: Replies: 3 :: Views: 547
One important factor is your choice of L:C ratio. How much current do you want flowing in your oscillating loop?
High A goes with high C, low L.
Low A goes with low C, high L.
A low value of emitter resistor has the effect of increasing gain. This is needed if your inductor has high DC resistance.
Analog Circuit Design :: 03-29-2017 05:48 :: BradtheRad :: Replies: 7 :: Views: 719
IRF450 is 500 V MOSFET in TO3 package, IRFP450 a similar chip in TO247. Obviously high- and low-side transistors are NMOS type.
IR2153 is self-oscillating driver with complementary outputs and can work in this circuit.
Elementary Electronic Questions :: 01-25-2017 17:49 :: FvM :: Replies: 5 :: Views: 799
I think your LNA is oscillating
RF, Microwave, Antennas and Optics :: 01-02-2017 19:14 :: BigBoss :: Replies: 13 :: Views: 800
A self-oscillating transistor is not necessarily achieving high efficiency, you need to watch the waveforms.
There are many possible problems, e.g. the collector voltage might rise to high so that transistor breakdown occurs, the oscillation frequency could also jump to a higher mode.
Hobby Circuits and Small Projects Problems :: 12-09-2016 16:29 :: FvM :: Replies: 14 :: Views: 1187
I designed a SMPS with 12v and 1 amps output. When i connect a dc bulb of load 12v 10W. The smps output oscillates (turns on and off) frequently for some time and then the output goes stable. what causes this problem. The pwm ic used here is TNY 278PN and feedback circuit with optocoupler and TL431.
How to overcome this? so that my smps output
Analog Circuit Design :: 11-26-2016 12:04 :: Mokthar :: Replies: 6 :: Views: 1966
As I understand it, the principle is to get two coils oscillating at the same (or nearly the same) high frequency. The coils are air-core. A metal core would interfere with the ability to detect metal.
Bring metal close to one coil, which should alter its oscillating frequency. This creates a beat (difference) frequency between the oscillators. Th
Analog Circuit Design :: 10-20-2016 16:43 :: BradtheRad :: Replies: 1 :: Views: 667
Skip initial transient analysis is only useful and possibly needed for simulation of linear oscillators like LC or phaseshift. Relaxation oscillators like NE555 don't have a stable operation point and always start oscillating without specific means.
Analog Circuit Design :: 10-03-2016 08:00 :: FvM :: Replies: 10 :: Views: 1163
Did you use the recommended pcb design shown in the datasheet? If you made a different pcb design then the amplifier might be oscillating at a high frequency which will cause it to get very hot.
Analog Circuit Design :: 09-23-2016 19:23 :: Audioguru :: Replies: 3 :: Views: 960
How can you regulate 40V with a maximum measurement range of 4.9*8 = 39.2 V?
The code is implementing a hysteretic I controller which is potentially unstable, at least must show an oscillating output.
Did you test it's operation with a lower set point, e.g. 20 or 30V?
There should be limiting means to avoid OCR2 overflow.
Microcontrollers :: 09-15-2016 06:48 :: FvM :: Replies: 6 :: Views: 465
Overshoot doesn't happen in a "simple low pass filter with just a resistor and capacitor" which has a pure exponential step response. You need a least a second order filter with complex pole pair, e.g. made by a capacitor, inductor and a resistor. It has an oscillating step response if the damping is low.
Analog Circuit Design :: 08-19-2016 21:48 :: FvM :: Replies: 4 :: Views: 557
An application note "AAN-2 Driving Capacative Loads" states that as a bigger capacative load is driven by an opamp, the frequency response changes such that the output oscillates and increasing it beyond a certain point shall cause the output to become unstable. It does not give scope output.
I want to understand for a square wave and a sine wav
Analog Circuit Design :: 08-04-2016 10:02 :: matrixofdynamism :: Replies: 3 :: Views: 395
Hi, i want to realize a fully digital closed loop pwm modulator for my class d amplifier but i've no idea on how to start with my design.
Googling i've found sigma delta modulator and self-oscillating class d amplifier implemented in analog way (input+feedback -> integrator -> comparator -> flip-flop).
At the moment the mosfets of my class d
Analog Circuit Design :: 07-17-2016 18:38 :: franticEB :: Replies: 1 :: Views: 358
can anyone help me to make work the constant current circuit with TL494 Half bridge config , Constant Voltage is working ,
in constant current mode even the the ic can control the current the wave form is oscillating in sawtooth shape at 50hz to 100hz in some range like 0.5amps to 0.65
and 0.8 to 0.9 , other range is ok
My SMPS is 100V
Power Electronics :: 06-18-2016 08:20 :: hardsoft :: Replies: 1 :: Views: 849
I should point out one thing..
Either your VNA calibration is not well done or your device is oscillating.
RF, Microwave, Antennas and Optics :: 06-16-2016 21:16 :: BigBoss :: Replies: 11 :: Views: 1097
Before solving the scope issue, I have a feeling that the circuit is not oscillating in this configuration.
I think something is wrong, or is missing from the schematic.
RF, Microwave, Antennas and Optics :: 05-31-2016 11:50 :: vfone :: Replies: 22 :: Views: 1477
not interested in buying one already made.
If you feel like experimenting, this is a simple method to turn 12VDC into 24VAC sinewaves. It combines:
* full H-bridge
* oscillating action through LC 2nd order butterworth configuration
* automatic detection of resonant frequency
* boosts supply voltage to a higher vol
Analog Circuit Design :: 05-21-2016 15:52 :: BradtheRad :: Replies: 3 :: Views: 495
Plotting the stability circles for the provided S-parameters of NE3210S01 can be seen that the transistor is potential unstable in 1GHz-7GHz frequency range.
Making stable to use as an LNA perhaps is not a problem, but to make it stable and then to make it oscillating could be a
RF, Microwave, Antennas and Optics :: 05-10-2016 08:00 :: vfone :: Replies: 9 :: Views: 985
I am doing calculations on negative feedback oscillator. Here is some confusing part. If oscillation condition is met either at input or output port, then circuit is oscillating. I understand that. But when i calculate reflection coefficients for both cases, i get different matching networks. I thought that formula of Gout and Gin for both cases w
RF, Microwave, Antennas and Optics :: 04-27-2016 04:42 :: Terminator3 :: Replies: 0 :: Views: 426
I Know a guy who built this exact circuit 35 years ago. His power supply works to this day.
I got the schematic from him. Our layouts are different and I attribute this fact to mine oscillating and his not.
All I know is that the circuit works. I visited him about a month ago and gave it a go. Flawless. Current limiting works great and stable. Bett
Analog Circuit Design :: 04-13-2016 19:29 :: diydidi :: Replies: 16 :: Views: 877