The best(?) oscillation mode is series resonance

[peranders]

My statement of series resonance oscillators seems to be forgotten. Why is that nobody uses it? It's rather easy to order crystals for that and as I understand the crystal is more controlled.

http://www.diyaudio.com/forums/showt...098#post281098

Picture here, simplified of course.
http://www.diyaudio.com/forums/attac...&postid=281098

[hjelm]

P-A
Just for my understanding a couple of questions.
1: Where do you tap the clock signal in the image shown?
2: Are there any spice models of crystals?

[peranders]

1 You can take the signal at the collector of the main transistor or from te JFET but you must have an emitter follower if you don't want to load too much.

2 Yes, but I think someone here can give you that information. Netlist, where are you?

[Elso Kwak]

Originally posted by peranders
My statement of series resonance oscillators seems to be forgotten. Why is that nobody uses it? It's rather easy to order crystals for that and as I understand the crystal is more controlled.

http://www.diyaudio.com/forums/showt...098#post281098

Picture here, simplified of course.
http://www.diyaudio.com/forums/attac...&postid=281098

Hi Per,
Quoting from those papers you promised to sent me but never did........?

[peranders]

Originally posted by Elso Kwak


Hi Per,
Quoting from those papers you promised to sent me but never did........?

You will get them...

[Elso Kwak]

Originally posted by peranders

You will get them...

?

[Jocko Homo]

Herr Per on a fishing expedition......"just collecting the facts"........probably so he can start building clock kits. Right???

You really don't expect me to help you, do you???

Hey, Lars, don't look behind you............someone else wants to make clock kits.

Only it won't be me. But you will be able to say that I was the first to warn you.


Jocko

[peranders]

Jocko, in a positive mood these days. Suppose I plan to make an oscillator and also plan to make it in SMD, how many would be interested do you think? Just compare the ALW group buy and my SMD regulator. I think Lars can be quite calm about the competition if there was any. SMD is not for the average DIY'er, that much do I know.

Futhermore I think SMD is the way to go when it comes to MHz circuits and fast rise times.

This thread did I start only because this type of oscillator seems to be rather unknown. Maybe Elso can improve his clock although his is the best already.

[Fred Dieckmann]

"SMD is not for the average DIY'er, that much do I know."

WHAT!!!!?????? I thought it was no sweat to work with.........

If you stay with 1206 and larger passives it really isn't that bad. Maybe it wasn't the fact that your regulator is SMT that is the reason for the greater popularity of the AWL regulators. Maybe it was the fact that he spent a very large amount of time and effort in designing and optimizing the circuit and even listening to changes in the design. Or the fact that he has been answering questions on regulator design instead of asking them on the forum. Na......... that couldn't be it.

Maybe someone will come along with a design based on the work that others have done, but with some unique design approaches to further develop the regulators performance. Maybe they will use SMT where there is an advantage in the circuit and not just for the exercise of doing the whole thing in SMT just to be different.

Maybe someone will design a regulator with the option of series prereg (something better than that dinosaur the 317) followed by the option for a shunt, series, or dual tracking regulator with an active ground derived from a single input voltage. Maybe someone will design a supply with small dip breadboard section of the PCB for configuring the reference voltage circuit of their choice: voltage regulator, series voltage reference, CCS and shunt, TL 491.... ect. Maybe the provision to run the op amp rails greater than the regulated output voltage for greater gain bandwidth or with smaller rails than the regulators output voltage to allow regulated voltages greater than the supply limits of the op amp. If only someone who knew enough to go beyond fairly close copies of what's already been done would come along. I wonder where we could find someone like that? If we could just find a guy smart enough to do a new design (for free of course) and yet stupid enough not to know that someone on the forum (or even another DIY forum) will copy it and sell it as their own work. For instance a forum member who would put patented by (their name) on a copy of someone else's board layout, or would use the name of an another designer to promote their effort without his OK and anger him enough not to participate in the forum anymore.

[peranders]

Fred, I suppose you have nothing to say about series resonance oscillators?

The hard part of SMD is that you

* MUST be able to solder

* keep the parts in ORDER, because they are ummarked in many cases and when the do have text, the text is too small if you are a bit older.

Those two aspects are the hardest to live up to, not the small parts itself. 0406 is quite easy to solder but IC with 0.63 or 0.5 mm is very much harder.

About patent: The patented design I have made pcb's for is made by permission from the patent holder and you can also read about and also the conditions for the usage of the pcb's.

The regulator you talk about is not patented as far as I know.