Thanks Isak and Jay,

I will try to find the way you described. But I have a regular peizo buzzer which does not have any oscillator, I want to use it for two reasons, the second reason is that it is cheap just 15 cents. And the first reason is that I can only find this type in our area. ha..ha.. haa..
..... please do not mind mistakes (if an...y) in my above message.. as I am riding above ... while writing on a camel....

I mean, I am writing above while riding on a camel....

Rauf / Microlink