### Author Topic: Stan Meyers Figure 9XB vs Figure 12  (Read 4026 times)

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##### Stan Meyers Figure 9XB vs Figure 12
« on: April 25, 2011, 11:35:23 am »
it seems that there are a few different ways to hook up those 7490 ICs

on 9XB timer pin 3 input to pin 14 on the left with pin 11 as the output of the 7490
connect 2367 &10 to ground and use pin 5 as VCC (5+)
connect 1 & 12 together and you have a divide by 10 counter

On my figure 12 simulation i used the same power and ground pins as before, but had the 555 pin 3 go to pin 14 input and used pin 11 as the output.
this time i left 1 and 12 unconnected and i got a Divide by 2 counter

Which is the best?
If both start with a center frequency of 40Khz on the 555 pot
and 9xb then gives 4Khz - 400 Hz - 40Hz as the choices
while:
fig 12 ( as a divide by 2 setup)
would give   20Khz - 10Khz and 5Khz

what is the reason behind the divide by 10 or the divide by 2 selectors in this circuit ?

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #1 on: April 25, 2011, 12:11:39 pm »
What is 9xB?  Is that the "gas type" switch ?

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #2 on: April 25, 2011, 12:31:42 pm »
divide by 10, says everywhere
divide by 2, says nowhere

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #3 on: April 25, 2011, 21:54:56 pm »
This is how fig 12 should be setup.

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #4 on: April 25, 2011, 22:03:13 pm »
also here is fig 9.

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #5 on: April 26, 2011, 02:34:23 am »
divide by 10, says everywhere
divide by 2, says nowhere

youre missing the point of my question... why not divide by 2 ?

the 50 % duty cycle is not possible with a 555 timer @ 40Khz unless the values for the pot and caps is way different than what the patent drawing shows (9XB)

to get a 50% duty cycle you need a 1.8k resistor between pin 7 and 6/2 and a 7nf cap between pins 6/2 and ground, then you need a 5k pot with a head and tail of 10 ohms...this gets you colse to 50% duty cycle at 40Khz

What i believe stan did was shoot for 40Khz center frequency and divide by 2 on the figure 12 circuit to get a clean 20Khz 50% duty cycle through the counter and the added benefit of having 10Khz and 5Khz for various timing functions in the HGMS system.

With a divide by 10   we get 1 dirty 40Khz signal to start with then we get 4 Khz 400Hz and 4 Hz these frequencies are too low to be of any use???

any comments on the functionality ?

@tony
will multisim 11 open multisim10 files???

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #6 on: April 26, 2011, 02:39:38 am »
all u need is the divide by 10...based on the perimeters of the gated pulse generator, you will only need frequencies between 0hz-200hz...so no need for frequencies higher than that.

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##### Re: Stan Meyers Figure 9XB vs Figure 12
« Reply #7 on: April 26, 2011, 03:16:03 am »
to remain true to stans original patent documents
In the stan meyer full data document we find ( and in the new zealand video) he mentions 10KHZ resonant frequency

open the full data PDF and search for every occurance of the term "hz" . you will find the following:

resonant frequency 1 khz up to and beyond 10khz...

10khz for faster response to acceleration

variable pulse frequency generator maintaining a 50% duty cycle 10 khz or above, clock signal to accelerator ( output "G" )

\top of page 1-9 leds firing at 1 hz to 65 hz

Optoschmitt, LED pickup circuit at 100Khz

that pretty much says it all

Tony, your Ms10 files open with Ms11, thanks
I noticed that your figure 12 555 timer only has a range of 1.2Khz to 12.115 Khz and the duty cycle on the 555 is nowhere near 50% duty cycle
so the first thing that comes to mind is a divide by 10 counter... the result would be 1.2 Khz.... how do we get the 10Khz 50% duty cycle clock signal from the full data document then?

(thinking outside the box)

thanks again