555 Timer Trouble
555 Timer Trouble
(OP)
Hi,
I recently tried to interface a 555 timer to a 4-bit up/down binary counter. I used a java calculator with circuit to design a frequency output of 2Hz(60% duty cycle). I etched the board and soldered all components. The counter wasn't functioning. I hooked up my scope to pin 3 and ground. There was no wave. Is there any suggestings? Should I get a better schematic and attach a schmitt trigger to pin 3 for a clean square wave?
Thanks very much!
I recently tried to interface a 555 timer to a 4-bit up/down binary counter. I used a java calculator with circuit to design a frequency output of 2Hz(60% duty cycle). I etched the board and soldered all components. The counter wasn't functioning. I hooked up my scope to pin 3 and ground. There was no wave. Is there any suggestings? Should I get a better schematic and attach a schmitt trigger to pin 3 for a clean square wave?
Thanks very much!





RE: 555 Timer Trouble
working with 555 is a fun , send yr schematic , i will fix it.
RE: 555 Timer Trouble
RE: 555 Timer Trouble
After reviewing the TI design, you should understand that Rb should be less than Ra for the 555 to oscillate. It also helps to choose a small capacitor (0.01-0.5 uF range). Since all you want to do is drive a counter, the "ON" duty cycle should be between 10%-40%, with edge triggered counters pulse width is not important.
Hope this helps.
-- Warpdrive.
RE: 555 Timer Trouble
have you tried to bread board you circuit first and also have you shorted pin 2 to pin 6???????
RE: 555 Timer Trouble
dorilla@hotmail.com