I connect a +9V supply and ground to 555 timer, the output is merely 0.6 Vpp. I connect the output of 555 to a comparator LM293, with ground reference, the output is still less than 1Vpp. I doubt the comparator couldnt cope with frequency 40kHz, hence i replaced it with op amp LM385. The waveform is nicer, no distortion, however, its Vpp is still less than 1Vpp.
When i increase the supply voltage from +9V to +12V, the output of 555 timer, op amp, just increase slightly to less than 1.5Vpp.
hmm.. i wonder why?
When i increase the supply voltage from +9V to +12V, the output of 555 timer, op amp, just increase slightly to less than 1.5Vpp.
hmm.. i wonder why?