Variable frequency and pulse width generator with 2 x 555's

Thread Starter

solmil

Joined Jul 19, 2005
1
Some years ago I built a circuit with two 555 (on two RS Australia 434-071 555 project circuit boards) that very nicely produced a variable frequency and variable pulse width.

Of course I've lost the circuit! (as you do!).

HELP!

Can anyone give me a circuit that does this?

Love and peace,

Sol
 

Wendy

Joined Mar 24, 2008
23,415
There are many, many ways to do this. So many it is easier to define what you need and we'll design to spec.

To add to what SgtWookie said,

What is your power supply voltage?

What are you going to be feeding this signal into?
 

MikeML

Joined Oct 2, 2009
5,444
...

Can anyone give me a circuit that does this?
Here is an updated circuit for one I have been using for years. It puts out a signal compatible with TTL or CMOS. By changing the supply voltage, you can use it for higher voltage logic, like 4000 series operated from 15V.

It requires only a single 555. It is adjustable over a duty cycle from about 2% to about 98%. The frequency range can be moved from ~1Mhz to a few pulses per Hour.
 

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