Transistor astable multivibrator

[aaronmawunze99]

Hie, guys can you help with a circuit of a high frequency astable multivibrator capable of achieving 500khz or higher and using discrete components only (no ICs)

 

[crutschow]

Probably.
Why does it need to be discrete?
Is this homework?

 

[aaronmawunze99]

I just want something cheap.

 

[Nigel Goodwin]

What is it actually for?, 500KHz is RF, and normally RF techniques would be used.

 

[aaronmawunze99]

I want to make a switch mode power supply for car amplifier. You know it uses ferrite cored transformer and that requires high frequencies, not the ordinary 50Hz

 

[Nigel Goodwin]

I want to make a switch mode power supply for car amplifier. You know it uses ferrite cored transformer and that requires high frequencies, not the ordinary 50Hz

A multivibrator would be a VERY poor choice, use a proper switch-mode IC.

You don't just use a free-running oscillator, you MUST have feedback to stabilise the output.

Here's a suitable example of the type of thing, with lot's of advise:

http://sound.whsites.net/project89.htm

 

[aaronmawunze99]

Thank you, I got it.