??? 06/09/06 14:53 Modified: 06/09/06 14:54 Read: times |
#118099 - not very good odds Responding to: ???'s previous message |
If you are careful, they might work.
not very good odds using a schmidt-triggered nand gate, with the same input to both inputs, albeit one delayed via series resistor followed by a cap to GND as Richard states above, basically the same with the same problems One-shots are a short-cut, and were popular during the '70's, before people learned how to design digital circuits. That may be part of the reason, but I used them in those days mainly because no reasonable alternative was available. The "design digital circuits" I use for pulse generation today, I could have designed then (it was not "before I learned how ") just as well - but when a flip=flop was some transistors, diodes and resistors (1/2 a "logic PCB".), "building" a shift register took a handful of FF PCBs, where the one shot in the foot typically took just 1/2 a "logic PCB". Today you get the entire shift register/counter in the same size (chip package) as the one shot in the foot. THAT, I think is the real reason for not using them any more. Erik |