Hi,
By using a 555 astable cicuit connected to a FET and bipolar transistor , I want to duty cycle control a high voltage source.
The astable is configured for 50% duty cycle and is used to switch a 12VDC source to the primary side of high voltage transformer.
What is the best transistor and/or Fet configuration to use.
Can someone give me a proposal for the schematic to follow and piece part number to use? The Fet need to drive 2 Amp.
Many thanks

 

You should look at Ronald Dekker's Flyback Converters for Dummies page:
http://www.dos4ever.com/flyback/flyback.html

I'm assuming that you are using the supply for electron tube/valve plates.

Keep in mind that dealing with high voltage, particularly when stored in large capacitors, can have lethal consequences. If you are new to electronics, stick with projects under 50v for a year or so.

 

There is unlimited information on the web.
Be extremely cautious.

what can bite, can kill.


excellent information from a recent post:
http://forum.allaboutcircuits.com/showthread.php?t=17699


also, a google search:
http://www.google.com/search?source...4GGLR_enUS318US212&q=ignition+coil+driver+555