Hi Tony,
When you get a chance to look at the voltage amplifier circuit, perhaps you might have an idea as to what type and rating of capacitors to use. The associated text does provide a part number for the diodes.
http://www.geofex.com/circuits/+9_to_33.htm
On the GermKiller2 yahoo group, there are some circuit diagrams. I thought those were yours. Sorry for the confusion. One diagram eliminated the LED portion of the blood electrifier circuit.
Thanks for your time and I'm not wanting to be a pest. But... : ) I'm still a little foggy the frequency modulation process.
1.) Is the location to make this alteration off of Pin 2?
2.) Is what changes the frequency from 4 Hz to 1/60 Hz, the addition of the 2.4 M Ohm resistor between Pin 2 and the 0.1 uF cap?
3.) Am I understanding you correctly that I may need to try different resistors to get the desired frequency?
Thanks Again,
Steffan
On Nov 8, 2007, at 10:02 AM, Tony Moody wrote:
On 7 Nov 2007 at 11:03, Steffan Heydon wrote about :
Subject : Re: [microelectricitygermkiller2] R
>
> Hi Tony,
> The URL for the 9V batteryvoltageamplifier 9 + 18, +25, +33V is below.
> I just realized the link I provided did not take you to the actual
> page.
>
> http://www.geofex.com/circuits/+9_to_33.htm
Yes an interesting site And didn't find that but figured out the gremlin; will do next time i'm on
line. Thanks.
>
> Rather than switching the output jack, I think I will just use a small
> push-to-make switch in order to manually switch the LED test circuit.
Yes, a good move. leds use a lot of power in that circuit. Anyting to make it micropower
would be good.
> I take it the zener diodes are just to run the LED as the zener
> diodes, the LED and the 22 uF cap were removed from your modified
> circuit?
Huh? My modified circuit? My own circuits are in pencil in a little book here and right now I
can't find the book.
Hmm, its a while since I designed on this. think you needed higher value Z's for the higher
supply voltage, so you probably right. Take care not to exceed the opamp specs or they will
fade on you.
>
> So you are saying to add a 2.4 mega ohm resister between pin 2 and the
> 0.1 uF cap? This will change the frequency 1/60 hertz or every 30 sec?
> You have found this to be more effective than the 8 hertz setting?
No, i didn't say that. . The published circuit that i worked from had those values and that goes
at nominal 4Hz. You will have to try altering those values to get what you want. I personally
had the feeling that the older design of about 1Hz was more effective but have no way of
being categoric about that. Also I battled to get the signal to be symmetrical at slow speed.
Have fun,
Tony
>
>
>
>
> Blessings,
>
> Steffan
>
>
>
> On Nov 7, 2007, at 10:23 AM, Tony Moody wrote:
>
>
>
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