I am trying to use a 555 timer to vary the duty cycle at a preset frequency...any suggestions?

 

I am familiar with 555. Can you elaborate on application?

 

Get a dual, I believe it's a 556. use one astable to set the frequency and the other as a monostable (one shot). There are trick circuits for pwm but, the dual will be more stable and allows individual adjustment.

Regards

cww

 

Hello this is Giorgos .You can control the charge current of the capasitor in the 555.
For further explanasion write to :

"[email protected]", mailto:[email protected]

 

Hello this is vincent. You can help me circuit control duty cycle use op-amp or 555. For further explanaion write to:

[email protected]