RC Circuit

[Jdo300]

Get a 4069 hex Schmitt Trigger inverter IC and then you only need
one RC unit to build a working square wave generator.

Hi Stefan,

I am also trying to make a switching circuit to turn on and off mosfets to switch the voltage from some caps over a coil. Do you know of any good websites that explain how to use the IC?

[bitRAKE]

Since this is the half-baked area of the site: how about a Marx bank for fast high voltage switching?

[raburgeson]

I just tried a marx bank, It cascaded my mosfets, The fets can't take it- Oh bum. An alternator stator might be custom wired to pulse controlled by the speed of the alternator. I'll look at it, don't see any reason why it can't be done. But first I have to check my present circuit on water, I have decided I need to change over to stainless screen to get more surface area and am having a problem finding the screen.
In Super Capacitors abbarue posted a cap diode maybe in stead of a mosfet? And I am still looking at clipping the sawtooth of a rc, hope this generates harmonics.

Most of the circuits we are investigating are high freq. or high v or both. The government and big business know many of the secrets we are trying to find. They do not want us discovering these and have suppressed componets that can handle the required voltage and frequencies, have no doult government and big business have solid state devices that do exactly what we need to do and this devices are hidden so we have to find ways without them. This will include developing our own components and work arounds. Limiting what our circuits do by using what is availible is stopping us. I for one am not going to let them hold knowledge from me forever just out of reach. This is a simple thing generate power with a coil it has to be done. A power supply is the most basic need for any serious experimenter and all of you must realise how important it is to be able to deliver any required souce voltage and frequency at a matchable impedence.

[zenarrow]

I noted the date is a little old on here from 2006, but just something I thought worth mentioning.
If you are pulsing into a coil, you will get a back EMF when the field collapses from DC pulses (square waves, saw tooths etc) A back EMF in itself is more powerful than the field building up initially, as it collapses instantly. This is when the points fire in a car, when the field collapses. Great for making a zapper too. And even with it for a zapper, a capacitor is used across the points to reduce wear, and also gives a bigger zap result.

The point I want to make here is that most circuits pulsing to coils, have a protection diode to stop the back EMF, as it fires Mosfets and transistors. Even 5VDC relays in electronic circuits have a diode in reverse polarity across the coil, so as to short out the back EMF.

Otherwise a MOSFET fried and other electronics can be an expensive mistake.
I often find a circuit may seem easy in concept in theory, but ends up with a lot of protection and voltage stablization extras. IE switching transisters need to be biased to turn off otherwise atmospheric conditions on a humid day can turn them on, stuff like that.