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

Started by Jim Thompson in sci.electronics.design4 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....


Lowering oscillator voltage

Started by rich in sci.electronics.design6 years ago 11 replies

I have an application that requires a frequency input of no more than 2.5Vp. Most oscillator will swing close to the rail, in this...

I have an application that requires a frequency input of no more than 2.5Vp. Most oscillator will swing close to the rail, in this case 3.3V. I am planning on lowering the oscillator output by adding a couple diodes in series with Vdd to the oscillator, still in spec for the device. Any issues with this? (10MHz) Rich


Oscillator type names.

Started by Ian Field in sci.electronics.design2 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.design3 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...


Switching of crystals in crystal oscillator using a 74HC4316 ??

Started by sparks in sci.electronics.design9 years ago 14 replies

Hi, Ive got a radio that has rotary switch selection of crystals for the 1st local oscillator. I want to have electronic selection, where I can...

Hi, Ive got a radio that has rotary switch selection of crystals for the 1st local oscillator. I want to have electronic selection, where I can change the crystal selected by use of control lines. Can I use something like the 74HC4316 to do this without stuffing up the capacitance of the oscillator and pushing the crystals far off freq? The oscillator is a Colpitts type and the crystals ar...


Oscillator buffer

Started by o pere o in sci.electronics.design5 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.design2 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.design2 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.design2 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.design3 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 ...


Magamp oscillator

Started by Piotr Wyderski in sci.electronics.design2 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


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.design4 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.design4 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


class c rf amp with bfr93a

Started by neddie in sci.electronics.design7 years ago 22 replies

Hi to all. I'm looking to make a small 433Mhz transmitter using bfr93's. I want to have a oscillator , followed by a small class c amp ,...

Hi to all. I'm looking to make a small 433Mhz transmitter using bfr93's. I want to have a oscillator , followed by a small class c amp , both using bfr93. Tho oscillator will be a standard Colpits oscillator , with a SAW resonator. I'd like to attach a class c amp (followed by filtering obviously) to boost the power. I've got a spice model for the BFR93 , from NXP. What I want to know is ...


oscillator with constant amplitude

Started by Tom Del Rosso in sci.electronics.design2 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.design5 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.design11 months 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.design5 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 (...


XO controlled 480Hz Oscillator

Started by Chris in sci.electronics.design8 years ago 68 replies

What is the simplest way to get 480Hz from a crystal controlled oscillator? Looks like most of the pre-packaged XO's and VCXO, seem to put out...

What is the simplest way to get 480Hz from a crystal controlled oscillator? Looks like most of the pre-packaged XO's and VCXO, seem to put out much higher frequencies. Would a series of dividers be the best way? Thanks, Chris KQ6UP


Lowering oscillator voltage

Started by rich in sci.electronics.design6 years ago 3 replies

Hello, I have a design that requires a reference frequency, 10 MHz, 2.5 Vp max. Most oscilators drive the out put close to the rail, in...

Hello, I have a design that requires a reference frequency, 10 MHz, 2.5 Vp max. Most oscilators drive the out put close to the rail, in this case 3.3V. I am going to lower the voltage by powering the oscillator through a couple diodes, still within spec. Anyone see a problem with this or have a better solution? Thanks Rich