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simple temperature controller – Circuit Schematic
simple temperature controller
The internal comparator of the 555 timer, combined with a thermistor, makes a low-cost temperature controller. ...
Square-wave generator with 555 – Circuit Schematic
Square-wave generator with 555
A single timing resistor ensures that the output is a square (50% duty cycle) wave at all frequency settings. ...
Pulse generator as astable multivibrator – Circuit Schematic
Pulse generator as astable multivibrator
The pulse repetition rate is selected by positioning SI to the desired position and the rate remains essentially constant when the resistors which determine on...
Delayed pulse generator – Circuit Schematic
Delayed pulse generator
The circuit offers independent control of initial delay and pulse rate. ICIc is connected as a pulse generator whose operation is inhibited by the normally low ...
Electronic flash trigger – Circuit Schematic
Electronic flash trigger
A negative pulse at the input is fed via capacitor Cl to the input pin (2) of the IC, Pin 2 is held slightly above its triggering voltage of 1/3 Vcc by the volt...
Auto-advance projector – Circuit Schematic
Auto-advance projector
The circuit is built around a 4001 quad two-input NOR gate, it provides switch selectable auto-advance times of 5, 10, 15, 20, 25 or 30 seconds through the remo...
Ramp generator – Circuit Schematic
Ramp generator
The linear charging ramp is most useful where linear control of voltage is required. Some possible applications are a long period voltage controlled timer, a vo...
Multiplying pulse widths circuit – Circuit Schematic
Multiplying pulse widths circuit
A circuit for multiplying the width of incoming pulses by a factor greater or less than unity is simple to build and has the feature that the multiplying factor...
Frequency divider – Circuit Schematic
Frequency divider
If the input frequency is known, the timer can easily be used as a frequency divider by adjusting the length of the timeing cycle. Figure shows the waveforms of...
Ring counter with variable timing – Circuit Schematic
Ring counter with variable timing
Shift pulses are generated by the unijunction transistors. The intervals between pulses are controlled by CT and RT. ...
Voltage-to-pulse duration converter – Circuit Schematic
Voltage-to-pulse duration converter
Accuracies to better than 1% can be obtained with this circuit (a), and the output signals (b) still retain the original frequency, independent of the input vo...
Mp pulse width control – Circuit Schematic
Mp pulse width control
Differential multiplexers are generally used in process control applications to eliminate errors due to common mode signals. In this circuit however, advantage ...
Tone burst generator – Circuit Schematic
Tone burst generator
The tone burst generator supplies a tone for one-half second after the power supply is activated; its intended use is a communications network alert signal. Ces...
Wiper control circuit IIV – Circuit Schematic
Wiper control circuit IIV
U1 is configured to operate in the standard astable mode, providing a form of relaxation oscillator. When power is applied, C2 initially charges through Rl, R2 ...
Bell circuit with two 555 timers
This simple Bell circuit uses two 555 timers. The frequency is controlled by the capacitors that must be preserved almost identical in value to each other for b...
Astable/Monostable oscillator using 555 IC
The 555 is a highly stable device for generating accurate time delays or oscillation. Aditional terminals are provided for triggering or resetting if desired. I...
Water Softener Circuit
That circuit is based at a technique to remove or neutralize the salt in water, and protect the pipes at home as well as the washing machines or our selves fro...
Toggle on off switch – Circuit Schematic
Toggle on off switch
This circuit toggles on and off a NE555 with a single momentary switch. Unlike a mechanical bistable relay the circuit backs to the start condition if you switc...
Relay Toggle with 556 schematic – Circuit Schematic
Relay Toggle with 556 schematic
This toggle circuit operates by using a couple 555 timers wired as inverters. Pins 2 and 6 are the threshold and trigger inputs to the first timer and pin 5 is ...
Simple Monostable Flip Flop – Circuit Schematic
Simple Monostable Flip Flop
The monostable flip flop, sometimes called a 'one shot' is used to produce a single pulse each time it is triggered. It can be used to debounce a mechanical swi...