The thread related to large signal PSpice models and an emitter follower comes from the following problem: I have an oscillator that should...

The thread related to large signal PSpice models and an emitter follower comes from the following problem: I have an oscillator that should drive a digital part of the system. In short, what is the best way to achieve this? My first attempt has been a common base Colpitts oscillator that gives a signal riding on the +Vcc rail. This has been AC coupled to a 74AC gate biased to the poin...

So here's a schematic of a standard LM386 power oscillator: http://www.interfacebus.com/lm386-square-wave-oscillator-circuit.jpg I have an...

So here's a schematic of a standard LM386 power oscillator: http://www.interfacebus.com/lm386-square-wave-oscillator-circuit.jpg I have an idea for a thing where what I'd like to have is a second LM386 oscillating at the same frequency and amplitude, but opposite phase as the first one, for push-pull drive. But I'd like to not use any further active parts other than the second LM386, if...

I'm buidling a little relaxaton oscillator for a project using a cd4093 quad nand gate with schmitt trigger inputs. I'm using a 200 ohm...

I'm buidling a little relaxaton oscillator for a project using a cd4093 quad nand gate with schmitt trigger inputs. I'm using a 200 ohm resistor and a 100n cap in the RC network. If I've done my calculations correctly, I was hoping to have an oscillator at around 30kHz. But my frequency counter is only showing around 8. Supply voltage is 5V. I understand that the frequency is depe...

Could some electronics guru here please help ? What is the best way to select a transistor for an oscillator ? Consider a Colpitts oscillator...

Could some electronics guru here please help ? What is the best way to select a transistor for an oscillator ? Consider a Colpitts oscillator running at 5 MHz. The following are the analysis steps. 1. Select a value for the LC tank capacitor C1 = C2 = C 2. Select a load e.g., R=50 Ohm 3. To start oscillations, gmR > C2/C1. In this case gmR > 1 4. Using the oscillation frequency and

Is it at all possible to build an oscillator entirely from non-linear magnetics (OK, solid state diodes are allowed)? Best regards, Piotr

Is it at all possible to build an oscillator entirely from non-linear magnetics (OK, solid state diodes are allowed)? Best regards, Piotr

If the power supply voltage is high, say > =3V, it is pretty simple to design an oscillator (of unimportant output frequency and shape), which...

If the power supply voltage is high, say > =3V, it is pretty simple to design an oscillator (of unimportant output frequency and shape), which can be powered from an AC power source: just add a diode bridge at the power input lines and use any suitable DC-powered oscillator circuit. But what if the supply voltage is really low, say 0.2V? JFET-based oscillators can go really low, allegedly down

Quadrature oscialltor. Hi all, As part of the CV measurements (from a previous post) I'm thinking about a 1 MHz lockin. (Maybe a different...

Quadrature oscialltor. Hi all, As part of the CV measurements (from a previous post) I'm thinking about a 1 MHz lockin. (Maybe a different thread to talk about how to do the switching.) I was wondering if I could make a quadrature oscillator from opamps. (I've got some AD825's I thought I'd try.) Anyway spice seems to think it's possbile. Comments or ideas welcome. (Oh I had to add th...

I was looking at the SAW oscillator circuits at a co. called Epcos, and they just take an op amp with the SAW filter in the feedback loop....

I was looking at the SAW oscillator circuits at a co. called Epcos, and they just take an op amp with the SAW filter in the feedback loop. They explain that the op amp amplifies noise, but preferentially at the filter allowed frequency. 2 components. I love the simplicity, but does this approach have any drawbacks?

What's a good way to make a, say 2 or 3 GHz sinewave oscillator? I don't need extreme accuracy, and I'd like maybe 1 volt p-p. I was thinking...

What's a good way to make a, say 2 or 3 GHz sinewave oscillator? I don't need extreme accuracy, and I'd like maybe 1 volt p-p. I was thinking a cheap MMIC with PCB delay line feedback. MiniCircuits VCOs are around $20, which isn't bad. The output would go into a PWM modulator and then an AC-coupled communications channel.

Anyone have any experience with how dual gate mosfets perform in a crystal oscillator role, at low voltages ( < 3 v), at frequencies say 200...

Anyone have any experience with how dual gate mosfets perform in a crystal oscillator role, at low voltages ( < 3 v), at frequencies say 200 - 500 MHz? -- ----Android NewsGroup Reader---- http://www.piaohong.tk/newsgroup

HP 200C Wein Bridge oscillator up for sale on eBay. $125. "Thank You For Looking At Are Item"

HP 200C Wein Bridge oscillator up for sale on eBay. $125. "Thank You For Looking At Are Item"

Hello, I'd like to drive a small high frequency transformer at around 100kHz-300kH= z with a 24Vpk signal, I tried building up an astable...

Hello, I'd like to drive a small high frequency transformer at around 100kHz-300kH= z with a 24Vpk signal, I tried building up an astable multivibrator with a = couple of caps and transistors but i couldn't get it to drive the transform= er, it wouldn't even make anything close to a nice square wave.... anyone k= now of a better simple oscillator circuit I could use to do this? thanks! ...

I am unable to simulate the followingg PUT-based relaxation oscillator in the most recent LTspice (with BC547B and...

I am unable to simulate the followingg PUT-based relaxation oscillator in the most recent LTspice (with BC547B and BC557B): https://upload.wikimedia.org/wikipedia/commons/9/9f/PUT_LED_blinker.png Nothing wants to oscillate. Looking for a bug I have also tried the simplest possible neon lamp oscillator (with Vstrike=100V, Vhold=50V, R=220k, C=1u), but there are no scillations either: ...

NCD2100 is a digital capacitor. We use it in a couple of products to tune an LC oscillator at powerup, to get close to 50 MHz. Then...

NCD2100 is a digital capacitor. We use it in a couple of products to tune an LC oscillator at powerup, to get close to 50 MHz. Then a narrow-pull-range varicap takes over. What happens, when the oscillator starts up, is that the frequency chirps, namely jumps up with a time constant of a couple microseconds. Then it settles down. If we stop it and restart soon, it's right on. But the longe...

Folk, Thanks to some good help here in the past, I have a nice clean oscillator (for my new fox transmitters), but I'm having trouble with...

Folk, Thanks to some good help here in the past, I have a nice clean oscillator (for my new fox transmitters), but I'm having trouble with the LTSpice simulation at higher frequencies. I'm assuming that the Intersil Spice model for the CA3046 is bad, and I know JT has a better one. Anyhow, I have two questions about the attached LTSpice schematic. 1) When I set it to 30MHz, LTSpice ...

Could some electronics guru on this group please help ? I am trying to set up a SPICE simulation for an Armstrong oscillator. The problem seems to...

Could some electronics guru on this group please help ? I am trying to set up a SPICE simulation for an Armstrong oscillator. The problem seems to be with designing the transformer and/or excitation coil. Are there any good tutorials or related material online. Any hints/ suggestions would be of immense help. Thanks in advance.

Hello, I have a working Royer Oscillator. This version is not current fed. It is a push push tolpolgy and the LC oscillationis are set by...

Hello, I have a working Royer Oscillator. This version is not current fed. It is a push push tolpolgy and the LC oscillationis are set by the transformer inductance and winding capacitance. The schematic looks like a multivibrator except the reistors in the collectors are replaced withthe half primaries of the pushpull transformer. This circuit has BJTs and has a sine wave output but I w...

Would it be possible to build a single transistor Hartley oscillator by substituting a pancake (spiral) coil for each leg of the center-tapped...

Would it be possible to build a single transistor Hartley oscillator by substituting a pancake (spiral) coil for each leg of the center-tapped inductor, and then placing one coil flat on top of the other so the insulation between them takes the place of the cap? If the current in each coil is made to flow opposite to the other, could their proximity to each other also be used to vary th...

Some people struggle to try to get an oscillator running in LTspice. This article describes different types of Colpitts and Clap oscillators snd...

Some people struggle to try to get an oscillator running in LTspice. This article describes different types of Colpitts and Clap oscillators snd shows how to calculate the component values to get them to run. Crystal oscillators are discussed, along with a method to drastically shorten the startup and settling time in order to view the actual oscillator waveforms. The descriptions are a...

I'm sitting on a heap of germanium transistors. From the time that computers made of discrete germanium transistors were decommissioned. Also 10...

I'm sitting on a heap of germanium transistors. From the time that computers made of discrete germanium transistors were decommissioned. Also 10 mm and 6 mm ferrite core. Can I make on oscillator, that runs on 1V , preferably using coils ? (Also trying to use LTSpice for the first time.) I can measure inductance of coils thanks to the miracle component testers from China. Groetjes Albert ...