Giantkiller moves forward into Full Heterodyning.

[gyulasun]

Hi,

If I may chime in: The IRF840's rise/fall time is in the order of 20-21ns under conditions defined in data sheet, see here: http://www.tranzistoare.ro/datasheets3/fairchild/IRF840.pdf

May I notice that the 555 is also manufactured in CMOS process and it is much "faster", its output square wave has rise/fall time around 15ns (!), works up to 3MHz in astable mode and is fully pin and other data compatible with its age old bipolar version.  see data sheet here http://cache.national.com/ds/LM/LMC555.pdf

rgds, Gyula

[giantkiller]

Greatly appreciated.
In my previous coil / copper test I noticed that 200k was more than adequate especially when the adjacent coils are driven opposing each other and a low induction feedback wrapped around the whole thing. 

The ionizers and stunguns work in the range of 6khz to 24khz. A rise time of 100us can do the trick.

--giantkiller.

[giantkiller]

The IRF840 coil driver.

--giantkiller.

[Feynman]

Thanks GK


I'll mention that today I did some 555 experiments.   I used a Radio Shack 555CN timer, part 276-1723, manufactured by Texas Instruments.  It has NE555P stamped on the chip.  This is the chip I tested.

<see below...>

[Feynman]

Experiment Details:

R1 = 1k
R2 = 10k
C = independent variable: 0.1uF, 0.01uF, or 100pF   
(ceramic: +- 20%, +- 10%, and +- 5%, respectively)
Decoupling: 47uF electrolytic
IC:  NE555P by Texas Instruments

*** Okay , so I just realized this experiment needs to be run again.  The scope was not calibrated.  I will post new results soon.