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
