# Generate high voltage using LM555 with a transformer

high voltagetransformervoltage

I'm a French student (please forgive my bad English spelling) who works on a system of portable echograph (you can find the information of the project on the wiki of echopen). Could you help me please?

I would like to generate a tension of 100V. First, I took a transformer from a system which is used to transform 230v to 12v. I tested it with a frequency generator to determine the inductance of the coil and the transformation coefficient:

``````L1 = 11.13mH
L2 = 31.89 mH
``````

I saw that at 13kHz the voltage was higher.
I transformed 15Vpp to 110V and I wanted to integrate it into a system which used 10v.
So, I used a LM555 component to have a oscillating circuit.

The circuit I used:

My observation and problem:

• I want to use a MOSFET to control the 10v but the voltage is dropping
• The generating voltage from the transformer is not enough maybe I
need two elevation stages
• When I plug the transformer, the square wave signal is distorted
• I can't have more than 50V from the transformer (I have more using
the frequency generator)

Edit: I forgot to tell, I can't have more than 50V from the transformer using the oscillating circuit, with the frequency generator I have 100V from 15Vpp (the problem is the tension dropping with a load resistance I suppose the frequency generator don't have power enough)

Edit 2 (02/31/2015) : this circuit works thanks a lot to everybody and especially "jp314", I have 130V from 12v!