285 Threads found on edaboard.com: Oscillating
Audioguru, I think they mean a synchronous rectifier instead of self oscillating. Using a MOSFET as a synchronized switch to provide rectification.
Elementary Electronic Questions :: 03-27-2016 12:56 :: betwixt :: Replies: 5 :: Views: 670
how? because even though there are capacitors in your active filter, there is a non-zero DC gain of the circuit. WHEN the loop is locked, that DC gain is used to tune the VCO to keep it locked. The capacitors, to some extent, just help the loop from oscillating/ringing if a perturbation happens.
RF, Microwave, Antennas and Optics :: 01-12-2016 10:52 :: biff44 :: Replies: 1 :: Views: 522
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 voltage. Sho
Professional Hardware and Electronics Design :: 12-25-2015 08:45 :: FvM :: Replies: 13 :: Views: 1215
Hi, I'm trying to build a DC motor regulation circuit, however I'm having some trouble with getting my rotary encoder to work properly. I tested the encoder in a pretty simple manner: I hooked it up to my Arduino board, and monitored one of the encoder channels on my PC. The output of the channel was in a form of oscillating pulses while the encode
Robotics and Automation Forum :: 12-12-2015 15:20 :: Strela91 :: Replies: 1 :: Views: 896
I am trying to simulate my PLL for the 3 different process corners.
For the fast corner, I get a result as shown:
Why is the Vcont (Control voltage driving the VCO) oscillating like this? It should lock at 40 Mhz or what could be the reason for the oscialltions?
It works for the slow and typical corners b
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-18-2015 07:20 :: amsdesign :: Replies: 3 :: Views: 566
The factory added input level pots to each channel of this stereo amp (a custom mod for the purchaser) when it was built years ago. Now one of the channels is oscillating. The oscillation affects the audio range and will vary somewhat in frequency and amplitude depending on the setting of the pot.
I swapped pots between channels and all was well
Analog Circuit Design :: 11-06-2015 19:26 :: Hertzilla :: Replies: 4 :: Views: 554
I attached the schematic of a gated ring oscillator and its timing and phase diagram.
Having had this figure I have two questions.
First of all, can anybody describe the phase behavior of the gated ring oscillator? How does the oscillator start oscillating from the initial phase at the rising edge of input data? In fact I am interested
Analog Circuit Design :: 11-02-2015 16:41 :: Saraparisa :: Replies: 0 :: Views: 407
thermal effects in the transistor and varactor. Use a power transistor with a big flange, to get small thermal resistance, and just throttle it back like it was a small signal transistor. The varactor, decouple it as much as you can.
Why not leave it all DC powered, but just snub the RF signal so it stops oscillating.
RF, Microwave, Antennas and Optics :: 09-26-2015 11:13 :: biff44 :: Replies: 39 :: Views: 2495
I'm learning HSPICE. When simulating a ring VCO, I can't get oscillating wave. It seems to be locked,but i'm sure the connection is right for the netlist is available on Cadence Spectre. Is there any issues.
Thanks in advance.
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 09-21-2015 15:06 :: Kristya :: Replies: 2 :: Views: 720
Hello I have found this power pierce oscillator in an old magazine and I have tried it with sucess, using the 2n2166 which gave max output at 3.5W.
I have also seen this circuit which is another type of oscillator that is used as a self oscillating mixer in receive mode.
I was wondering is I c
RF, Microwave, Antennas and Optics :: 09-10-2015 07:33 :: neazoi :: Replies: 4 :: Views: 510
For designed op-amp's enable circuit, step input results proper steady state output. But with pulse input, output is oscillating. Why so?
Analog Circuit Design :: 09-07-2015 18:46 :: zetta_byte :: Replies: 3 :: Views: 577
Attached is the figure of a instumentation amplifier which I am trying to get to work. I am trying to amplify a 10MHz signal received by a 2uH center-tapped aircoil. Its running off a 9V battery and a reference voltage of 2.5 V (Vref) is generated by a general purpose op amp. Also an LDO provides a regulated 5V supply to the opamps (LM
Analog Circuit Design :: 08-19-2015 22:05 :: zoulzubazz :: Replies: 6 :: Views: 974
The self-oscillating MOSFET inverter is a rather bad design, it's neither guranteed to oscillate at all nor to keep the transistor maximum ratings.
Elementary Electronic Questions :: 08-03-2015 07:35 :: FvM :: Replies: 8 :: Views: 856
A bit simplified, the snubber capacitor is charged by a series circuit of resistor and leakage inductance. While R charging involves 0.5CV? losses, L charging is lossless (but oscillating). Varying the L/R ratio gives different fractions 0.5CV?.
Power Electronics :: 08-01-2015 10:46 :: FvM :: Replies: 4 :: Views: 695
AC supply probably has lots of 100Hz ripple. Measure it with no load and full load signal.
Each power amp is probably oscillating above 100Khz causing overheating. If it gets hot with no load, put 2.7Ohm 0.47uF as indicated in specs or similar series snubber on each output to ground.
If DC out is not matched at Vcc/2, offset the offending one wit
Analog Circuit Design :: 07-28-2015 22:04 :: SunnySkyguy :: Replies: 21 :: Views: 3940
Some DROs not oscillating without metal plate placed above resonator. As i understand it is not frequency tuning (phase condition) problem, because moving resonator does not start oscillation. Although placing small metal piece above resonator instantly starts oscillation. What stands behind this? Less radiation because magnetic field lines stick t
RF, Microwave, Antennas and Optics :: 07-14-2015 08:49 :: Terminator3 :: Replies: 1 :: Views: 412
I'm not suprised it doesn't work. The original circuit is self oscillating, L1 and L2 have to be on the same magnetic alignment and corectly orientated.
In your circuit you:
1. overload the output of the micro because you omitted the base resistor in Q3
2. have the secondary coils connected to the base of Q1. It should either be the collector or t
Microcontrollers :: 07-06-2015 20:19 :: betwixt :: Replies: 1 :: Views: 925
You circuit must be unstable (oscillating)from feedback phase shift as 8.2v/11k is not the same as 0.3V/1k in output shared current.
... Edit.. What does scope say? And what is the total load ...caution wire capacitance and inductance in layout.
This is design does not bias FETs properly and seems poor in general.
It may need AC load
Analog Circuit Design :: 07-05-2015 07:36 :: SunnySkyguy :: Replies: 15 :: Views: 1075
Problem you have is when resistors are changed Ic current must not be changed. Resistor 1k can have so high resistance that 270ohm resistor is not needed. In this case temperature stability is lowest possible. Changing resistors you also change the gain and phase of amplifier which may stop oscillating.
10mA current of a divider is a bit high for Q
RF, Microwave, Antennas and Optics :: 07-01-2015 13:00 :: Borber :: Replies: 7 :: Views: 578
2SC4367 has a typical transit frequency of 1 GHz (min. 600 MHz), so you're lucky if the circuit is oscillating at 900 MHz at all. You all want to use transistor with GHz bandwidth instead.
Apart from this point, what's the value of C2? Is your circuit layout suited for 900 MHz at all?
If you connected an antenna, it's frequency dependent radi
RF, Microwave, Antennas and Optics :: 06-22-2015 09:19 :: FvM :: Replies: 8 :: Views: 1171