A sequential timer circuit device are used in many applications for initializing conditions during start-up or for activation of test signals in sequences such in test equipment device. The circuit diagram below shows a sequencer circuit with possible applications in many sistems.
As you can see, it uses the NE555 precision timer IC which capable of
producing accurate time delays or oscillation. These timing circuits can be
connected to provide such sequential control with various combinations of
astable or monostable circuit connections. You can used it with or without
modulation for extremely flexible waveform control.
You may see the NE555 Datasheet here (source: hqew.net)
TRJA154K035R600... ADG604YRUZ SMC2-499RFI Am29DL800BT90EE... SY10EL32VZCTR CLS4D28NP-330NB TDA1517P MC74HC595ADTR2G HLMP-EH25-TV400 DA103J12B215QF6