Transistor astable multivibrator

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aaronmawunze99

New Member

• Mar 11, 2019

• #1

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

Well-Known Member

Most Helpful Member

• Mar 11, 2019

• #2

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

 

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aaronmawunze99

New Member

• Mar 12, 2019

• #3

I just want something cheap.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Mar 12, 2019

• #4

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

 

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aaronmawunze99

New Member

• Mar 12, 2019

• #5

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

Super Moderator

Most Helpful Member

• Mar 12, 2019

• #6

aaronmawunze99 said:

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

Click to expand...

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:

**broken link removed**

 

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aaronmawunze99

New Member

• Mar 12, 2019

• #7

Thank you, I got it.