The 555 is dedicated as a timing device. The LM324 is a quad op-amp and one of the poor ones. About the only advantage is 4 in one package.
As for use as a timer the 324 needs lots of glue to make it work. Not saying don't use it, but for a timing device the 555 is made for this with lots of flexibility. If you want a op-amp I prefer the LF353 for audio and the LM358 has the rail-to-rail service and is better than a 324. 73, ron, n9ee/r >From: [EMAIL PROTECTED] >Date: 2008/04/23 Wed AM 12:25:30 CDT >To: [email protected] >Subject: Re: [Repeater-Builder] Re: Carrier Control Timer (use the COR-2 >circuit) > >At 4/22/2008 11:25, you wrote: > >>Re: Carrier Control Timer (use the COR-2 circuit) >> >>The 555 timer is a lot like the 723 (voltage reg) chip in regards >>to a very large variety of available circuit options and layouts >>that simply must obey certain rules detailed in the Mfgrs data >>sheets. Onward... >> >>The 555 is one of the most useful electronic circuit chips ever >>made. It has a fairly large number of possible simply configured > >Show me a "quad" 555 in one package. There was one once actually, the >558. Was sold by Radio Shack. Can't find them anywhere now, though. > >Show me a 555 used as an audio amp. > >I can build a complete COR/hangtime/TOT/audio interface using one LM324 >(actually, nowdays I prefer the TLV2374 - less crossover distortion & >better rail-to-rail performance). > >555s/556s certainly have their place, but for something as simple as the >above I find the rail-to-rail op amp more convenient & straightforward. > >Bob NO6B > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
