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Sequential timer – Circuit Schematic
Sequential timer
Many applications, such as computers, require signals for initializing conditions during start-up. Other applications such as test equipment require activation ...
Tone burst generator – Circuit Schematic
Tone burst generator
The first timer is used as amonostable and determines the tone duration when triggered by a positive pulse at pin 6. The second timer is enabled by the high out...
Linear voltage ramp generator – Circuit Schematic
Linear voltage ramp generator
In the monostable mode, the resistor can be replaced by aconstant current source to provide a linear ramp voltage...
Versatile two-phase pulse generator – Circuit Schematic
Versatile two-phase pulse generator
Two-phase clock generator uses two L161s to generate pulses of adjustable widths and phase relationships...
Programmable pulse generator – Circuit Schematic
Programmable pulse generator
Fast rise and fall times require the use of high speed switching transistors for the differential pair, Q4 and Q5...
Pulse generator – Circuit Schematic
Pulse generator
The duty cycle Of the output pulse is equal to R4/(R4 + R5) x 100%. For duty cycles of less than 50%, Dl can be eliminated and R2 raised...
Add-on triggered sweep – Circuit Schematic
Add-on triggered sweep
The circuit"s input op amp triggers the timer, setting its flip-flop and cutting off its discharge transistor so that capacitor C can charge...
Dual astable multivibrator – Circuit Schematic
Dual astable multivibrator
This dual astable multivibrator provides versatility not available with single timer circuits. The duty cycle can be adjusted from 5% to 95%. The two outputs pr...
Monostable circuit – Circuit Schematic
Monostable circuit
If the output is low, application of a negative-going pulse to the trigger input sets the flip-flop (Q goes low), drives the output high, and turns off 1. Capac...
Pulse-width modulator – Circuit Schematic
Pulse-width modulator
The monostable circuit is triggered by a continuous input pulse train and the threshold voltage is modulated by a control signal. The resultant effect is a modu...
Pulse-width modulator – Circuit Schematic
Pulse-width modulator
if the timer is triggered with a continuous pulse train in the monostable mode of operation, the charge time of the capacitor can be varied by changing the cont...
Game roller or chase circuit – Circuit Schematic
Game roller or chase circuit
The 555 timer produces a rapid series of pulses whenever switch SI is open. These pulses are counted in groups of 16 and converted into binary form by the 7493 ...
Linear frequency meter – Circuit Schematic
Linear frequency meter
The 555 is used in a monostable multivibrator circuit that puts out a fixed timewidth pulse...
DC flasher with adjustable on and off time – Circuit Schematic
DC flasher with adjustable on and off time
This circuit utilizes a power flip-flop and programmable unijunction (PUT)...
Missing pulse detector – Circuit Schematic
Missing pulse detector
The timing cycle is continuously reset by the input pulse train. A change in frequency, or a missing pulse, allows completion of the timing cycle which causes a...
Touch triggered bistable – Circuit Schematic
Touch triggered bistable
This circuit uses a 555 timer in the bistable mode. Touching T2 causes the output to go high; D2 conducts and D1 extinguishes. Touching T1 causes the output to ...
Windshield wiper hesitation control unit – Circuit Schematic
Windshield wiper hesitation control unit
This circuit uses the 555 timer in the asta-ble or oscillatory mode. The length of time the timer is off is a function of the values of CI, R2, and R3. The pote...
Touch switch – Circuit Schematic
Touch switch
The circuit is basically a NE555 monostable, the only major difference being its method of triggering. The trigger input is biased to a high value by the 22 oh...
Microprocessor programmable interval timer – Circuit Schematic
Microprocessor programmable interval timer
The microprocessor sends out an 8-bit binary code on its 8-bit I/O bus (the binary value needed to program the ICM7240), followed by four WRITE pulses into the ...
556 controls temperature and liquid level – Circuit Schematic
556 controls temperature and liquid level
One-half of a 556 dual timer monitors the temperature of a liquid bath, controlling a heating element that maintains temperature within ±2°C over a 32°...