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

Started by Jim Thompson in sci.electronics.design3 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.design1 year 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.


RF PA oscillator.

Started by John Lee in sci.electronics.design7 years ago 10 replies

Now I want to build a PA @ 80.36MHz, 75W on 50 ohm output. What oscillator type shall I use? I am learning RF PA design now. clapp? pierce?...

Now I want to build a PA @ 80.36MHz, 75W on 50 ohm output. What oscillator type shall I use? I am learning RF PA design now. clapp? pierce? colpitts? hartley? or DSS? FPGA or a single high speed DAC + current feedback OPAMP? I want ~50mW from the oscillator. Thanks!


Oscillator question

Started by Spehro Pefhany in sci.electronics.design2 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.design8 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...


opamp sine wave oscillator

Started by Inventor in sci.electronics.design9 years ago 61 replies

Hi, hope I'm posting to the right place. I created a nifty little sine wave oscillator. I have no plans to patent it just want to tell the...

Hi, hope I'm posting to the right place. I created a nifty little sine wave oscillator. I have no plans to patent it just want to tell the world about it cause I think it's pretty cool. You can download the pdf file here: http://www.freedomodds.com/osc/ I like it for lots of reasons, but what's more important is peer review. So what do you think of my nifty little oscillator?


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.design2 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 ...


Austron Oscillator Datasheet/Pinout Needed

Started by Jim Flanagan in sci.electronics.design8 years ago 2 replies

I am searching (for some time now) for data on an Austron Oscillator model #1630-2R (10 MHz). This oscillator has a an octal base and...

I am searching (for some time now) for data on an Austron Oscillator model #1630-2R (10 MHz). This oscillator has a an octal base and requires +12V for the osc and +26V for the oven. The osc case shows a NAVAIR part # 247AS-C0393-001. I've had no luck searching for either of these numbers. Any help would be appreciate. Thanks. Jim


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? ...


Whats different between these two circuits?

Started by readeraz in sci.electronics.design9 years ago 4 replies

Ringing choke circuit and blocking oscillator are different names of oscillator. Are they same meaning or they are different circuit in...

Ringing choke circuit and blocking oscillator are different names of oscillator. Are they same meaning or they are different circuit in practice? How to distinctly identify them? thanks


Need RF oscillator, phase modulation capable

Started by George in sci.electronics.design4 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?