Hi Richard, a beautiful video, thanks and very instructive for everyone. About these kinds of oscillators: I learned it the hard way to develop them and even now I am struggeling to get the purest wave out, tinkering with coils, bias, capacitive voltage divider, etc, etc. In practice I use a potentiometer to set the bias to the base, in your case the 100 K - 200 K voltage divider. And always a 1K resistor in series with the upper electrode of the potentiometer to the + lead (in this case, NPN transistor) to prevent a direct and silent burn out of the transistor when the wiper goes too far to the +, giving it a destuctive base current. But always fun to make these oscillators though it takes time and time and time...:-)
Thanks for your comments and information. I was experimenting with changing values of components. I was amazed how must the values can change and the Quartz Crystal still oscillates. Can not happen with a tank circuit. I'm going to try experimenting with high frequency JFETs.
Whatever fundamental frequency you're at, it looks like you have a 9th harmonic signal (little blips) riding on the fundamental. To dampen that out, you might try reducing the feeback to the base of the transistor by changing the bias resistors or the two 170pF caps. They give too much feedback to the base, I think. Keep the bottom cap at its 170pF value, but lower the top 170pF cap to, say, 100pF and see if that helps reduce the 9th harmonic distortion.
Thanks, very useful! The tech behind Crystal Oscillators is pretty new to me, so I was hoping to get a couple of basic questions answered, for which I was I was struggling to find answers online. 1) How exactly are the fixed output frequencies of an SPXO set? We have many 'standard frequencies' such as 10,12,16,20 MHZ, etc. Is it only due to the way the crystal is cut, or does it also depend on the other supporting circuitry within the Oscillator? 2) How does the circuitry for a programmable crystal oscillator (Such as Epson's) differ from a fixed frequency oscillator? I know these involve 'blank' oscillators that can be programmed to a desired frequency using a handler. Does it contain any circuitry such as programmable non-volatile memory? Thanks in advance!
I GOOGLED "quartz crystals frequeny made" and found a great deal of information. This is just one. www.sciencedirect.com/topics/physics-and-astronomy/quartz-crystals
Interesting. I always thought that breadboards were too full of stray capacitance to work at higher frequencies. I never tried it though. Thanks for the video.
Just so you can keep some of your hair lol. it does work but it can be a real pain sometimes. I would just lose connections sometimes or when the circuit doesn't work you're always assuming it's the breadboard. but it has worked for me quite a bit. I was starting with the oldest oscillators to the newer stuff on a chip. it all worked. the stability was not as good but it worked. The highest frequency I was at was about 30Mhz. it was a lot of fun building them all.
Awsome, excellent video, any video on RF transmitter and receiver module circuit diagram explaining the schematic, or You have designed any RF transmitter and receiver module circuit diagram explaining the schematic
50,000 Watt Transmitter Site th-cam.com/video/eGNw0aaj29k/w-d-xo.html AM Transmitter Build Project and Demo th-cam.com/video/hhDjj45O4Lc/w-d-xo.html Build FM One Transistor Transmitter Project Modification 3-3 th-cam.com/video/3tc3gBEU9Js/w-d-xo.html FM Stereo MPX Decoder Circuit and Demo th-cam.com/video/ACqEiFHCofI/w-d-xo.html FM Radio Signal Tracing th-cam.com/video/a5qa4OFockA/w-d-xo.html Oscilloscope signal tracing th-cam.com/video/B44wHjb8jMY/w-d-xo.html 1932 Philco Model 112 Circuit Signal Flow th-cam.com/video/dN1eBI-4onY/w-d-xo.html AA5 Radio Signal Flow th-cam.com/video/zknp0FOkPXU/w-d-xo.html
A ceramic material made to resonate on a frequency (say a 455 Khz ceramic IF filter with a certain bandwidth) differs from a typical quartz crystal that is used in this demo. A 32 KHz crystal for a clock has completely different properties and needs another type of electronic circuit to make it work.
@@AllAmericanFiveRadio I am a radio amateur and I like to play with frequencies...I also like to make transceiver with microcontrollers....... Thanks for the useful information, keep up the good work
Thanks for all the great videos you have made. When I was a kid I made a crystal radio by use of diode OA81 , clear glas, with a two stage OC75 germanium transistor amplifier. . In US I think you call it a "fox-hole radio" or something like that. I would like to make a simple crystal radio,! Do you have a circuit for an easy build radio I can make just for fun... The very best regards Kim Ps my friend and I had a 40 meter 3,5mm thick copper-wire as antenna between our windows about 25 meters up in the air...very dangerous in thunder weather!!
I just got a Crosley 66cr record/phono player. Can you tell me anything about it. I'd like to restore it but I can't find anything online except a manual from ebay
Could be a so called "overtone" crystal or a crystal that resonates on its so called "ground frequency". They have specific properties. Also the way that the crystal is cut out of the quartz material brings specific properties regarding the way it resonates: say lateral or otherwise. That has also an effect on the temperature stability.
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Glad to see you've overcome your car accident! Thanks for these videos; I'm learning a lot.
Thanks!!!!
Welcome back Professor, Hope you have a full recovery!
Thanks!!!!!
Hi Richard, a beautiful video, thanks and very instructive for everyone. About these kinds of oscillators: I learned it the hard way to develop them and even now I am struggeling to get the purest wave out, tinkering with coils, bias, capacitive voltage divider, etc, etc. In practice I use a potentiometer to set the bias to the base, in your case the 100 K - 200 K voltage divider. And always a 1K resistor in series with the upper electrode of the potentiometer to the + lead (in this case, NPN transistor) to prevent a direct and silent burn out of the transistor when the wiper goes too far to the +, giving it a destuctive base current. But always fun to make these oscillators though it takes time and time and time...:-)
Thanks for your comments and information. I was experimenting with changing values of components. I was amazed how must the values can change and the Quartz Crystal still oscillates. Can not happen with a tank circuit. I'm going to try experimenting with high frequency JFETs.
I've learned so many things on your channel, and still do ! Glad to see you're doing better now ☺️
THANK YOU!
Whatever fundamental frequency you're at, it looks like you have a 9th harmonic signal (little blips) riding on the fundamental. To dampen that out, you might try reducing the feeback to the base of the transistor by changing the bias resistors or the two 170pF caps. They give too much feedback to the base, I think. Keep the bottom cap at its 170pF value, but lower the top 170pF cap to, say, 100pF and see if that helps reduce the 9th harmonic distortion.
Thanks. I'm going to try JFETs.
Hi Rick glad to see your back on form great presentation as usual hope your health is better go safe from UK.
THANK YOU!
Hi Rick, nice to see you back. I hope you feeling better now :)
Thanks. I'm doing much better!
Thanks, very useful!
The tech behind Crystal Oscillators is pretty new to me, so I was hoping to get a couple of basic questions answered, for which I was I was struggling to find answers online.
1) How exactly are the fixed output frequencies of an SPXO set? We have many 'standard frequencies' such as 10,12,16,20 MHZ, etc. Is it only due to the way the crystal is cut, or does it also depend on the other supporting circuitry within the Oscillator?
2) How does the circuitry for a programmable crystal oscillator (Such as Epson's) differ from a fixed frequency oscillator? I know these involve 'blank' oscillators that can be programmed to a desired frequency using a handler. Does it contain any circuitry such as programmable non-volatile memory?
Thanks in advance!
I GOOGLED "quartz crystals frequeny made" and found a great deal of information. This is just one.
www.sciencedirect.com/topics/physics-and-astronomy/quartz-crystals
Great info, love your style.
THANK YOU!
Interesting. I always thought that breadboards were too full of stray capacitance to work at higher frequencies. I never tried it though. Thanks for the video.
Just so you can keep some of your hair lol. it does work but it can be a real pain sometimes. I would just lose connections sometimes or when the circuit doesn't work you're always assuming it's the breadboard. but it has worked for me quite a bit. I was starting with the oldest oscillators to the newer stuff on a chip. it all worked. the stability was not as good but it worked. The highest frequency I was at was about 30Mhz. it was a lot of fun building them all.
Some times, it also depends on how strong the output is.
Awsome, excellent video, any video on RF transmitter and receiver module circuit diagram explaining the schematic, or
You have designed any RF transmitter and receiver module circuit diagram explaining the schematic
50,000 Watt Transmitter Site
th-cam.com/video/eGNw0aaj29k/w-d-xo.html
AM Transmitter Build Project and Demo
th-cam.com/video/hhDjj45O4Lc/w-d-xo.html
Build FM One Transistor Transmitter Project Modification 3-3
th-cam.com/video/3tc3gBEU9Js/w-d-xo.html
FM Stereo MPX Decoder Circuit and Demo
th-cam.com/video/ACqEiFHCofI/w-d-xo.html
FM Radio Signal Tracing
th-cam.com/video/a5qa4OFockA/w-d-xo.html
Oscilloscope signal tracing
th-cam.com/video/B44wHjb8jMY/w-d-xo.html
1932 Philco Model 112 Circuit Signal Flow
th-cam.com/video/dN1eBI-4onY/w-d-xo.html
AA5 Radio Signal Flow
th-cam.com/video/zknp0FOkPXU/w-d-xo.html
very good explanation..... one question is this work in Frequency like 32 kHz crystal or 455 khz ceramic
A ceramic material made to resonate on a frequency (say a 455 Khz ceramic IF filter with a certain bandwidth) differs from a typical quartz crystal that is used in this demo. A 32 KHz crystal for a clock has completely different properties and needs another type of electronic circuit to make it work.
Here you see an experimental circuit to make such a 32 KHz clock unit work
th-cam.com/video/eJDj6Fa1LNM/w-d-xo.html
@@radiofun232
Thanks for the reply, that's exactly what I need
keep up the good work
The Quartz Crystal is about 10MHz
@@AllAmericanFiveRadio
I am a radio amateur and I like to play with frequencies...I also like to make transceiver with microcontrollers....... Thanks for the useful information, keep up the good work
Thanks for all the great videos you have made. When I was a kid I made a crystal radio by use of diode OA81 , clear glas, with a two stage OC75 germanium transistor amplifier. . In US I think you call it a "fox-hole radio" or something like that. I would like to make a simple crystal radio,! Do you have a circuit for an easy build radio I can make just for fun... The very best regards Kim
Ps my friend and I had a 40 meter 3,5mm thick copper-wire as antenna between our windows about 25 meters up in the air...very dangerous in thunder weather!!
Thanks K.J.H.
A friend has just got an early commercially made crystal radio. I'll do a video on it. The early crystal radios are simple circuits.
@@AllAmericanFiveRadio hi mr. Richard, thanks..I look foreward to see your video. Best regards Kim
Thanks for excellent explanation Rick I hope you Health continues to improve best Wishes Mate Ian.
Thanks Mate Ian. I'm doing much better now!
Thanks for sharing
Thanks.
good news and good and big work thank.s
Thanks.
whats the valuie of the rf choke you used you didnt mention its value
0.01mH, but almost any RF choke will work.
I just got a Crosley 66cr record/phono player. Can you tell me anything about it. I'd like to restore it but I can't find anything online except a manual from ebay
I would email Crosley
SUPPORT CENTER
www.crosleyradio.com/support
@@AllAmericanFiveRadio thank you!! I've been looking for a way to contact them!
When you said it is the wrong crystal, are you referring to its resonant frequency, or some other property?
Could be a so called "overtone" crystal or a crystal that resonates on its so called "ground frequency". They have specific properties. Also the way that the crystal is cut out of the quartz material brings specific properties regarding the way it resonates: say lateral or otherwise. That has also an effect on the temperature stability.
The circuit is designed for 1 to 5 MHz, I'm using about a 10 MHz Quarts Crystal.
how are you my friend i hope you are healthy
Thanks, I'm doing good now.
nice vid,
Thanks.
👍
Thanks