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A rule of thumb for making a saturated transistor switch is that the base current should be 1/10 of the required collector current. So,.... If your input voltage is the same as your output, the base resistor is 10 times the resistance of the collector resistor.how can I calculate the base resistor and collector resistor needed?
The 555 doesn't need much "time" to be triggered so the large pulse of current accross the 200I tried a 200 ohm pullup resistor, but my finger could still trigger it.
Would that circuit be suitable for triggering a 555 using the output from an amplifer.Don't bother doing any calculations, just use the values in the diagram below.