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Author Topic: TP600 - TPU PULSER  (Read 24418 times)

z_p_e

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Re: TP600 - TPU PULSER
« Reply #30 on: July 27, 2007, 09:22:23 PM »
@Earl,

Crystal oscillators are not exempt from frequency jitter at all. In fact there are many schemes designed around dealing soley with this issue.

RC oscillators may exhibit frequency jitter as well, but not likely worse than its crystal counterpart. Crystals excel mainly in stability over temperature mainly due to error reduction through frequency division.

At any rate, the TP600/900 is meant mainly as an experimental tool, and should not be worse in performance than the tube oscillators that SM started off using with his testing.

Darren
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turbo

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Re: TP600 - TPU PULSER
« Reply #31 on: July 27, 2007, 10:57:38 PM »
well there seems to be a diffrence in the harmonic content, it is written in an verry intresting old book i am currently reading (1966) i will examine it somewhat further.

Marco.

"I am using 6BQ7-A tubes for the input and phase inverter because they are VHF amplifier triodes designed to operate in Color TV at very high frequencies and so you can imagine how crystal clear my high frequencies are in my stereo amplifier."


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z_p_e

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Re: TP600 - TPU PULSER
« Reply #32 on: July 28, 2007, 08:52:44 AM »
PULSE WIDTH CONTROL QUESTION:

What would you guys prefer for the fine pulse width adjustment:

a) a 6 position rotary for fixed stepping (good for repeatability and matching) OR
b) a potentiometer to vary the PW continuously (good for fine adjustment, but will have to rely on control position for approximate repeatability and matching)

?

In either case, there will be a rotary for selecting the Pulse Width RANGE, similar to the Frequency RANGE control. So, two controls for Pulse Width; one is for RANGE, the other for fine adjustment in that range.

Let me know your thoughts, thanks.

Darren
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turbo

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Re: TP600 - TPU PULSER
« Reply #33 on: July 28, 2007, 09:46:49 AM »
Darren, ho abou both and a switch between to select either one of them?

then we can also easy measure the value of the variable one so when we find something we can write it down.

it has to be as percise as possible when it comes to tunning.

Marco.
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z_p_e

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Re: TP600 - TPU PULSER
« Reply #34 on: July 28, 2007, 03:12:53 PM »
Quote from: -[marco]- on July 28, 2007, 09:46:49 AM
Darren, ho abou both and a switch between to select either one of them?

then we can also easy measure the value of the variable one so when we find something we can write it down.

it has to be as percise as possible when it comes to tunning.

Marco.

Marco,

Having both can certainly be done, but I'm not sure how practical that is. Please keep in mind that the pulse width will not be that critical. However the frequencies and matching between them in "sync mode", will be critical. As such, I am surprised no one has asked for a "fine" frequency adjust control yet.

Because the pulse width is not that ciritical, I think it best the control be a continuously-variable one, i.e. a potentiometer. Then simply noting the control's position on the panel will allow you to repeat the setting and roughly match it between generators.

For the most part, the Pulse Width has nothing to do with tuning. That's done by altering the frequency. Once the frequency is set, the pulse width can be adjusted for a minimum effective setting. Once set, the Pulse Width control can be left alone, while the frequency control can be adjusted for further tuning.

Cheers,
Darren
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wattsup

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Re: TP600 - TPU PULSER
« Reply #35 on: July 28, 2007, 07:12:11 PM »
@z_p_e

Thanks again for your trying to understand my laymens terms. By pulsing negative or positive, I simply mean the opening and closing of negative or positive. ON and OFF.

I think it will be much simpler for me to contract a local small EE company that has recently made for me some special DC to DC converters.

I think also that we need new thread of Glossary of OU Terms where Post #1 can hold the growing list and the thread can be used for consensus building amongst members. This way we can have one place to refer to for terms to use on the board. I would not have time to be the Master of Cerimonies so if anyone has the guts, be my guest. Maybe open the first 4 posts and name them A - F, G - L, M - R, S - Z.

Question: What is a peep or peeps? lol
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Thaelin

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Re: TP600 - TPU PULSER
« Reply #36 on: July 30, 2007, 06:08:40 PM »
Quote from: wattsup on July 28, 2007, 07:12:11 PM
@z_p_e



Question: What is a peep or peeps? lol

 ;D    Peeps = People

thaelin
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z_p_e

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Re: TP600 - TPU PULSER
« Reply #37 on: August 05, 2007, 07:32:25 AM »
OK folks,

The TP900 is finally done!   :)

I estimate that I've put in at least 60 hours in designing the pulse circuitry alone, and I've been at this 16 hours already just today. My eyes are goin' nutty already  :o

I'm quite happy with what I came up with, and perhaps even a little proud of my acomplishment. Its not an HP instrument, but HP never made one of these, that's for sure!

I managed to retain the frequency range of the TP600, and implemented a precision pulse generator circuit to boot. I hope a 5ms to 17ns pulse width range will please those that are interested.

The Pulse Generator circuit turned out to be a big project all on its own. It was a challenge, but I enjoyed it.

See the first post, on the first page here for the TP900.1.pdf document. I hope you can appreciate the effort that went into the design....enjoy.
http://www.overunity.com/index.php/topic,2831.msg41474.html#msg41474

Regards,
Darren
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turbo

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Re: TP600 - TPU PULSER
« Reply #38 on: August 05, 2007, 10:24:05 AM »
Hi Darren,

Thank you verry much for the circuit :)
as you might have noticed i also jumped into the tubes.
i decided to take the advized route first tubes and then solid state.
yesterday i noticed the importance of perfect sine waves and the question arizes if pulses can be used instead.
there is still a lot we need to find out.

Marco.
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z_p_e

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Re: TP600 - TPU PULSER
« Reply #39 on: August 07, 2007, 08:43:54 AM »
My apologies guys.

Sometimes there is an error or two in the first release (especially with no checker).

I guess I must have done a copy and paste with a resistor then forgot to change its value. R10, R16, and R22 have been corrected to 33k.

I have updated the document to TP900.2.pdf available again here:

http://www.overunity.com/index.php/topic,2831.msg41474.html#msg41474

Regards,
Darren
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