There are many different kinds of oscillators, you could try two transistors as an astable multivibrator, a schmitt trigger gate with feedback around it, opamp oscillators - the list is pretty well endless.dave_1986 said:i am currently doing an AS-level electronics project and my project includes a clock, i have made a working 555 astable clock but i need to experiment with other types of clock. So can anyone suggest any other ways of making clocks to me?
+ needs to run at 250Hz +/- 30Hz
Presuming you mean PIC's, there are many different ways to do it. You could use an internal hardware timer to generate interrupts, and count the interrupts. But a simple way would be used nested loops to waste time, so if you wrote a subroutine to delay 1000mS you could do something like this.Kev said:How do you set them up in a circuit and how do i use on to give a short positive pulse every second?