Injection Locking an Oscillator (was Novel Zeitgeber devive for antique clock)

Started by Jim Thompson in sci.electronics.design7 years ago 37 replies

PAL fails to realize that injection locking an oscillator requires an oscillator > :-} His post was an attempt to output a subharmonic without...

PAL fails to realize that injection locking an oscillator requires an oscillator > :-} His post was an attempt to output a subharmonic without the oscillator. There are better ways to handle such a scenario. For example, see my boom-box machine (circa 1979)... Here is an injection-locked OSCILLATOR....


Oscillator type names.

Started by Ian Field in sci.electronics.design5 years ago 19 replies

Does anyone know the correct name for the 2 transistor LC oscillator that looks like a long tailed pair? I though it was a Franklin...

Does anyone know the correct name for the 2 transistor LC oscillator that looks like a long tailed pair? I though it was a Franklin oscillator - the google hits are ambiguous to say the least, but its possible I have the name wrong. Thanks for any help.


Oscillator question

Started by Spehro Pefhany in sci.electronics.design5 years ago 30 replies

Hi, As an alternative to a bridge type setup I'm thinking of measuring a relatively low Q inductance (a lot of series resistance) by using...

Hi, As an alternative to a bridge type setup I'm thinking of measuring a relatively low Q inductance (a lot of series resistance) by using a tank circuit/oscillator. What kind of oscillator will be the least sensitive to the Q (oscillate closest to (2*pi* sqrt(LC))^-1?) ? And respond reasonably fast to changes in LC.. (seems like that's a conflicting requirement..) I have cont...


1ns max jitter oscillator, cheap - for fast 4 diode sampler

Started by Anonymous in sci.electronics.design1 year ago 118 replies

Hi I'm working on my ~3ns 4 diode sampler (preferable 1ns if possible) So I need a pretty good oscillator, with low jitter I have never...

Hi I'm working on my ~3ns 4 diode sampler (preferable 1ns if possible) So I need a pretty good oscillator, with low jitter I have never needed a good oscillator before, so on this topic I am totally at square one First I was thinking about an RC oscillator, and cleaning up the jitter. RC typically have 1us of jitter (found info on the web), and a crystal oscillator, standard t


Oscillator buffer

Started by o pere o in sci.electronics.design8 years ago 38 replies

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...


LM386 oscillator challenge

Started by bitrex in sci.electronics.design5 years ago 21 replies

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...


Class C Power Oscillator

Started by bitrex in sci.electronics.design5 years ago 13 replies

I'm trying to design an ultrasonic class C power oscillator to use with a project I'm working on. I'm vaguely basing it off a circuit I recall...

I'm trying to design an ultrasonic class C power oscillator to use with a project I'm working on. I'm vaguely basing it off a circuit I recall seeing in an early 1960s-era book called "Industrial Transistor Circuits". It seems I'm not remembering it correctly, and I don't really know much about the design of this type of oscillator as it's having some problems oscillating in simulation...


CD4093 oscillator frequency

Started by bitrex in sci.electronics.design5 years ago 33 replies

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...


Oscillator Proposal

Started by Jim Thompson in sci.electronics.design6 years ago 24 replies

Oscillator Proposal... Suppose I have a series RLC, one end grounded, the other end driven by a chip, how might I make that into an...

Oscillator Proposal... Suppose I have a series RLC, one end grounded, the other end driven by a chip, how might I make that into an oscillator? All wild ideas accepted... this is for a custom chip. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et ...


How to select transistor for oscillator ?

Started by Anonymous in sci.electronics.design2 years ago 45 replies

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


Magamp oscillator

Started by Piotr Wyderski in sci.electronics.design5 years ago 128 replies

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


A bit of help with a crystal oscillator

Started by Peter in sci.electronics.design10 months ago 67 replies

I have read a lot of stuff on this topic but find it hard to apply it. I have a 25MHz xtal. For example Kyocera CX3225GB25000P0HPQZ1. The spec...

I have read a lot of stuff on this topic but find it hard to apply it. I have a 25MHz xtal. For example Kyocera CX3225GB25000P0HPQZ1. The spec says typ drive level 10uW, 100uW max. The oscillator circuit is the usual Pierce one as in e.g. here https://electronics.stackexchange.com/questions/368945/crystal-oscillator-circuit-design?rq=1 The CPU is a STM32F407VGT6. The development ki...


JFET Colpitts Oscillator is kind of L-C oscillator but this scheme has one inductor and two capacitors

Started by Patrick Chung in sci.electronics.design7 years ago 1 reply

JFET Colpitts Oscillator is kind of L-C oscillator, but this scheme has one inductor and two capacitors. Now it can be simulated...

JFET Colpitts Oscillator is kind of L-C oscillator, but this scheme has one inductor and two capacitors. Now it can be simulated on: http://www.cirvirlab.com/simulation/jfet_colpitts_oscillator_online.php read more: http://www.cirvirlab.com/index.php/tutorials/128-jfet-colpitts-oscillator-simulation.html


JFET Hartley oscillator as a kind of L-C resonant circuit oscillator is practical L-C oscillator with JFET as active amplifier

Started by Patrick Chung in sci.electronics.design7 years ago

New tutorial is ready http://www.cirvirlab.com/index.php/tutorials/127-jfet-hartley-l-c-resonant-circuit-oscillator-si mulation.html ...

New tutorial is ready http://www.cirvirlab.com/index.php/tutorials/127-jfet-hartley-l-c-resonant-circuit-oscillator-si mulation.html It now can be simulated on: http://www.cirvirlab.com/simulation/jfet_hartley_oscillator_online.php


oscillator with constant amplitude

Started by Tom Del Rosso in sci.electronics.design5 years ago 33 replies

I don't want anybody to design it for me, but in general how would you make an oscillator with a sine output of constant amplitude over a range...

I don't want anybody to design it for me, but in general how would you make an oscillator with a sine output of constant amplitude over a range of supply voltage (let's say the operating range of the op-amp). What I have in mind is a battery supply, but with no power wasted in a regulator. Sure the oscillator would also waste power but not as much. Would a square output be simpler? ...


Need RF oscillator, phase modulation capable

Started by George in sci.electronics.design8 years ago 4 replies

Can someone suggest where I should look for a used tunable RF oscillator around 1 MHz that can be phase modulated from an external input?

Can someone suggest where I should look for a used tunable RF oscillator around 1 MHz that can be phase modulated from an external input?


Low-voltage AC-powered oscillator

Started by Piotr Wyderski in sci.electronics.design4 years ago 23 replies

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


Accuracy of CD4060 R/C-Oscillator?

Started by Anonymous in sci.electronics.design8 years ago 10 replies

Hello, I've designed a simple R/C-Oscillator with a MC14060 (ON-Semi) C-MOS Logic IC. It's easy to calculate withe the formula f=1/(2.3*R*C) But...

Hello, I've designed a simple R/C-Oscillator with a MC14060 (ON-Semi) C-MOS Logic IC. It's easy to calculate withe the formula f=1/(2.3*R*C) But I can't find information on the tolerances for this frequency in the datasheet. I know it will be quite a lot. I guess 30 to 40%? But to really know if I can handle this, I need to know what exactly the manufacturer guarantees. Do other manufacturers (...


Common collector Colpitts oscillator frequency formula

Started by Anonymous in sci.electronics.design2 years ago 52 replies

Could some electronics guru please help ? I am trying to find the frequency of oscillation for a common collector Colpitts oscillator ? For...

Could some electronics guru please help ? I am trying to find the frequency of oscillation for a common collector Colpitts oscillator ? For a common emitter Colpitts oscillator, the frequency of oscillation is focs = 1/(2*PI*sqrt(L*Ct)) where Ct is the equivalent capacitance of the two series capacitors. The resonator is used as PI circuit, with a series inductor and 2 shunt capacitors...


Quadrature Oscillator

Started by George Herold in sci.electronics.design6 years ago 49 replies

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...