Blocking Monostable Construction

[Peterae]

Here are some construction details of a High Voltage Pulse circuit i built.

The original design came from this web site
http://mysite.du.edu/~etuttle/electron/elect37.htm



The coil construction and details.

CORE
Ferrite core is here http://www.maplin.co.uk/Module.aspx?ModuleNo=32792
Part Number is N87AB
31.8 mm Diameter
22.75 mm Length
18.50 mm Hole

COILS
Primary was 15 Turns Close together.
Secondary was 43 Turns Spaced around Circumference.

TRANSISTOR
Transistor i used was a BU2508AF Triple Diffused Planar Silicon
http://www.datasheetcatalog.org/datasheet/WINGS/BU2508AF.pdf

CAPACITORS
I used 2 0.1uF caps in parallel in place of the 0.1uF in the diagram to adjust the pulse width for my purpose.

A Very Simple circuit to build.

** Note i am not using the circuit above in the intended way, i am using the transistor to energize the secondary coil, and it is the BEMF that produces the large pulse after the pulse has finished, hence i have wound the coils with a different ratio from that stated in the circuit above to maximize this pulse amplitude, you will also notice because of this, that my pulse is positive going.

Video of Device in operation

Peter