Re: 555 capacitor calculator

[Guest guest]

The formula for a standard 555 timer circuit is: Tout = 1.1RC and then Frequency

= 1/Time. Radio Shack has a good little book in their engineering series

(available at all stores that I have been in) on using the 555 timer IC.

Good zappers do not use a 555 (it eats up batteries), they use a CMOS IC such as

a 40106 Inverter. Art Doerksen displays a typical circuit for what he calls the

" Big Zap " at: http://www.bestzapper.com/bigzap.htm. Click on the Big Zap circuit

near the bottom of the page. A typical circuit is shown below.

Hope this helps.

jackson

555 capacitor calculator

Hello,

Does anyone know of a source of an online or downloadable calculator

for the 555 chip used in Zappers ... that is able to calculate the

capacitor value needed to create output frequencies of 7.83 Hz and 15

Hz?

Thank you.

The group's main page has a menu to the left, with photos of Godzilla devices

and other things useful in research. These are free to members. Membership is

free, but you agree to be on your own, not take our freedom of speech as medical

advice. We are not doctors! Repeat, we are ordinary lay people, not experts,

not healthy officials, or geniuses of any kind. The information on this group

is not intended as medical advice. Most group members are NOT doctors or health

authorities. Please do not request medical advice, lest anyone get into trouble

out of human compassion. There are huge fines and issues currently involved

with unlicensed medical advice. The group is only here to share experiences

according to the theme of the group, namely testing if electrical stimulus might

inactivate microbes, as it seems to have done in the Einstein Medical College

labs. We are interested in your results, but cannot say anything a! bout

repeatability, or whether this might have medical benefits. Thanks, for your

understanding, good luck researching. --bG

[Guest guest]

On Wed, 28 Jul 2004 18:55:22 -0700, " Jer " <jreeder@...>

wrote:

>Good zappers do not use a 555 (it eats up batteries), they use a CMOS IC such

as a 40106 Inverter. Art Doerksen displays a typical circuit for what he calls

the " Big Zap " at: http://www.bestzapper.com/bigzap.htm. Click on the Big Zap

circuit near the bottom of the page. A typical circuit is shown below.

There is a CMOS version of the 555, usually named the LM555CM (or

something like that -- look for a " C " following the number). All the

normal 555 calculations are the same for that version.

-- Dean -- from (almost) Des Moines -- KB0ZDF

[Guest guest]

True, thanks for correcting the oversight.

jackson

Re: 555 capacitor calculator

On Wed, 28 Jul 2004 18:55:22 -0700, " Jer " <jreeder@...>

wrote:

>Good zappers do not use a 555 (it eats up batteries), they use a CMOS IC such

as a 40106 Inverter. Art Doerksen displays a typical circuit for what he calls

the " Big Zap " at: http://www.bestzapper.com/bigzap.htm. Click on the Big Zap

circuit near the bottom of the page. A typical circuit is shown below.

There is a CMOS version of the 555, usually named the LM555CM (or

something like that -- look for a " C " following the number). All the

normal 555 calculations are the same for that version.

-- Dean -- from (almost) Des Moines -- KB0ZDF

The group's main page has a menu to the left, with photos of Godzilla devices

and other things useful in research. These are free to members. Membership is

free, but you agree to be on your own, not take our freedom of speech as medical

advice. We are not doctors! Repeat, we are ordinary lay people, not experts,

not healthy officials, or geniuses of any kind. The information on this group

is not intended as medical advice. Most group members are NOT doctors or health

authorities. Please do not request medical advice, lest anyone get into trouble

out of human compassion. There are huge fines and issues currently involved

with unlicensed medical advice. The group is only here to share experiences

according to the theme of the group, namely testing if electrical stimulus might

inactivate microbes, as it seems to have done in the Einstein Medical College

labs. We are interested in your results, but cannot say anything a! bout

repeatability, or whether this might have medical benefits. Thanks, for your

understanding, good luck researching. --bG

[Guest guest]

Hi, thanks for your responses ... I should narrow my inquiry somewhat.

I am not an electronics technician, merely a former mainframe and PA

wireman ... yeah, screwdrivers, tie wraps, wire crimps and soldering

irons, etc.

I have assembled some Hulda Zappers (years ago) for various

uses. I am now interested in some frequencies other than the

(approximately) 30kHz produced by the Zapper.

What I'm looking for is a way to determine the caps needed to change

from the caps used on Geoff 's schematic to those needed for the

555 zapper circuit to output 7.83 Hz and 15 Hz, respectively.

The closest calculators I've found thus far only have entries that

output as low as about 30-40 Hz.

Variable output or off-the-shelf frequency generators (like Beck's,

etc.) are beyond my means (sucks living on disability).

Thanks - beamer

> Hello,

>

> Does anyone know of a source of an online or downloadable

calculator

> for the 555 chip used in Zappers ... that is able to calculate the

> capacitor value needed to create output frequencies of 7.83 Hz and

15

> Hz?

>

> Thank you.