Basic LM555 Timer CIRCUITPart List
C2 = .01uf
IC1 = LM555 Timer
SWI = n.o. momentary switch
R1 and C1 determine lenght of
out put pulse where t = R1 x C1
and R1 is in ohms and C1 is in farads .
by Tony van Roon
Showing posts with label IC. Show all posts
Showing posts with label IC. Show all posts
Basic Theory IC 555
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Theory Timer 555
Timer 555 is a timer IC that works based on the RC circuit and the comparator is coupled with a digital component (R-Sflip-flop). The first 555 of the type manufactured by Signetics SE-555 working at -55 ° C to 125 ° C and the NE-555 working at 0 ° C-70 ° C. Then 555 is produced with different designs include the LM555, 556 (dual version), and LMC-555 (CMOS version). Timer 555 operates at +5 V dc power supply sd +18 V with temperature stability of 50ppm / ° C (0.005% / ° C). Output 555 can be a current sink / source up to 200mA. IC 555 is compatible with the components of TTL, CMOS op-amps, transistors and other types of linear ICs.
Timer 555 can operate either as a monostable or astable. The resulting square wave output can have a variation of duty cycle ranging from 50 - 99.9% and the frequency of less than 0.1 Hz up to more than 100KHz. 555 Series consists of two voltage comparators (COMP1 and COMP2), a control flip-flop RS (reset / set) that can be reset from outside via the pin 4, an inverting amplifier output (A1), and a discharge transistor (Q1). Kompartor second bias level determined by voltage divider resistors (Ra, Rb, and Rc) contained between Vcc and ground. Inverting input 2/3Vcc komparator1 given input and noninverting input from the given input komparator2 1/3Vcc. Monostable operation requires the input pulse triggers the PIN2 of IC 555. Input trigger voltage drop of more than +2 / 3Vcc toward the voltage is less than + Vcc / 3.
Monostable operation Timer 555
Monostable multivibrator (MMV), also called a one shot, producing a pulse output with a certain period when triggered by a pulse input. Output from Oneshot will instantly go high following the trigger pulse (trigger) and will remain high in accordance with its period. When the period had expired, the output will return low. Outpt Oneshot will remain low until there is another trigger. IC 555 can be operated as MMV by adding an appropriate external circuit.
Both internal comparator prasikap given voltage with a certain voltage level by voltage divider arranged series (Ra, Rb, Rc). Inverting input voltage up to 2/3Vcc komparator1 given, and the noninverting input voltage komparator2 given Vcc / 3. Tersebutlah voltage operation resulted in 555 both as a monostable or astable. External timing circuit (R1C1) connected between Vcc and noninverting input komparator1 through pin6. Pin7 also been linked with causing connected as pin6 transistor to the capacitor C1. When the transistor is on, the resistance of the capacitor is so low that connect (short) through the relationship of CE transistor.
When 555 is connected to the source voltage, input voltage inverting komparator1 will receive registration 2/3Vcc and noninverting input voltage komparator2 would have amounted to Vcc / 3. This causes the RS flip-flop in a reset condition, so that its output Qnot high. Therefore flip-flop connected to the output through an inverting amplifier pin3 (A1) then the output 555 low. In these conditions the capacitor charge (charging). Qnot in the high cause transistor Q1 saturated, which means is connected to ground through a capacitor C1. So in this condition the capacitor to remove the charge (discharge) so that Vc = 0.
If PIN2 give trigger input, when pulsatrigger move towards less than 1/3Vcc voltage as shown in the picture, the noninverting input is more positive than the input komparator2 the inverter , so that the output komparator2 be high. At that time, FIP-flop in the set, so that the output Qnot her low and keuaran 555 high. Because of its low Qnot output, means of transistors in the off. Current flows from Vcc to ground through a capacitor C1. In other words, the capacitor re-charging. (Picture). Capacitor voltage will continue to rise until it reaches 2/3Vcc, at which time the output Vc = 2/3Vcc komparator1 be high and cause the flip-flop is reset and the output 555 back to low. The output 555 will remain until there is another trigger input.
All IC timers rely on an external capacitor to determine the interval of time off-on pulse output. The capacitor would require a certain time to charge or discharge through a resistor. Time can be explained and calculated from the resistance and capacity are given. Equation pulse period to 555 depending on the time required by the capacitor at the time of filling until it reaches 2/3Vcc voltage provided by the RC time constant. Thus, if the capacitor voltage e = E (1 - (-t/RC)), can be calculated time will enable the comparator threshold.
Vertical IC PIN OUT DATA
Vertical Vin = input (non-inverted), Vout = Vertical output, VfB = Vertical feedback (inverted inpput)
Vcc to pump-up can be traced through the diode PUM-up and pump up Elco Capacitor
VfB = or to Vin2
= Gnd or Vcc (-)
![]( "Vertical")
Vertical IC PIN-OUT DATA
AN5521 Vin = 4, Vout = 2, Vcc = 7, Gnd = 1, VfB =
AN5522 Vin = 7, Vout = 5, Vcc = 2, Gnd = 4, VfB = 1
AN5539 Vin = 4, Vout = 2, Vcc = 6, Gnd = 1, VfB = 5
AN15525 Vin = 7, Vout = 5, Vcc = 2, Gnd = 4, VfB = 1
LA7832 Vin = 4, Vout +2, Vcc = 6, Gnd = 1, VfB = 5
LA7835 = 2 Vin, Vout = 11, Vcc1 = 1, Vcc2 = 7,
LA7837 = 2 Vin, Vout = 12, Vcc1 = 1, Vcc2 = 8, Gnd = 11, VfB = 7
LA7838 = LA7837
LA7840 Vin = 4, Vout = 2, Vcc = 6, Gnd = 1, VfB = 5
LA7841 = LA7840
LA7845 = LA7840
LA7846 = 5 Vin, Vout = 3, Vcc = 7, Gnd = 2, VfB = 6
LA7848 Vina = 5, VinB = 6, Vout = 3, Vcc (+) = 7, Vcc (-) = 2
LA7876 Vina = 5, VinB = 6 Vcc (+) = 7, Vcc (-) = 2
STV9302 = see AN5522
STV9379 = See AN5522
TA8403 Vin = 4, Vout = 2, Vcc = 6, Vcc = 6,
TA8445 Vin = 2, Vout = 11, Vcc1 = 1 (9v), Vcc2 = 7 (26v), Gnd = 10, 50/60 =
TDA1771 Vin = 3, Vout = 1, Vcc = 9. Gnd = 5
TDA4865 Vin = 6, Vout = 5, Vcc = 1, Gnd = 4, VfB = 2
TDA8175 Vin = 7, Vout = 5, Vcc = 2, VfB = 1
TDA3653 Vin1 = 1, Vin2 = 3, Vcc1 = 9, Vcc2 = 6, Vou = 5, Gnd = 4
TDA8350 Vina = 1, VinB = 2, VoutA = 10, VoutB =, Vcc1 = 3, Vcc2 = 9, Ewin = 12, Ewout = 11
See tda8357 TDA8351 =
See TDA8357 TDA8356 =
TDA8357 Vina = 1, VinB = 2, VoutA = 7, VoutB = 4, Vcc1 = 3 (12v), Vcc2 = 6 (45V), Gnd = 5
TDA8358 Vina = 1, VinB = 2, Vcc1 = 3 (12v), Vcc2 = 9 (25V), VoutA = 4, VoutB = 10, Gnd = 6.7, Ewin = 5, Ewout = 8
TDA9302 = see LA78040
Continue reading[...]
Vcc to pump-up can be traced through the diode PUM-up and pump up Elco Capacitor
VfB = or to Vin2
= Gnd or Vcc (-)
Vertical IC PIN-OUT DATA
AN5521 Vin = 4, Vout = 2, Vcc = 7, Gnd = 1, VfB =
AN5522 Vin = 7, Vout = 5, Vcc = 2, Gnd = 4, VfB = 1
AN5539 Vin = 4, Vout = 2, Vcc = 6, Gnd = 1, VfB = 5
AN15525 Vin = 7, Vout = 5, Vcc = 2, Gnd = 4, VfB = 1
LA7832 Vin = 4, Vout +2, Vcc = 6, Gnd = 1, VfB = 5
LA7835 = 2 Vin, Vout = 11, Vcc1 = 1, Vcc2 = 7,
LA7837 = 2 Vin, Vout = 12, Vcc1 = 1, Vcc2 = 8, Gnd = 11, VfB = 7
LA7838 = LA7837
LA7840 Vin = 4, Vout = 2, Vcc = 6, Gnd = 1, VfB = 5
LA7841 = LA7840
LA7845 = LA7840
LA7846 = 5 Vin, Vout = 3, Vcc = 7, Gnd = 2, VfB = 6
LA7848 Vina = 5, VinB = 6, Vout = 3, Vcc (+) = 7, Vcc (-) = 2
LA7876 Vina = 5, VinB = 6 Vcc (+) = 7, Vcc (-) = 2
STV9302 = see AN5522
STV9379 = See AN5522
TA8403 Vin = 4, Vout = 2, Vcc = 6, Vcc = 6,
TA8445 Vin = 2, Vout = 11, Vcc1 = 1 (9v), Vcc2 = 7 (26v), Gnd = 10, 50/60 =
TDA1771 Vin = 3, Vout = 1, Vcc = 9. Gnd = 5
TDA4865 Vin = 6, Vout = 5, Vcc = 1, Gnd = 4, VfB = 2
TDA8175 Vin = 7, Vout = 5, Vcc = 2, VfB = 1
TDA3653 Vin1 = 1, Vin2 = 3, Vcc1 = 9, Vcc2 = 6, Vou = 5, Gnd = 4
TDA8350 Vina = 1, VinB = 2, VoutA = 10, VoutB =, Vcc1 = 3, Vcc2 = 9, Ewin = 12, Ewout = 11
See tda8357 TDA8351 =
See TDA8357 TDA8356 =
TDA8357 Vina = 1, VinB = 2, VoutA = 7, VoutB = 4, Vcc1 = 3 (12v), Vcc2 = 6 (45V), Gnd = 5
TDA8358 Vina = 1, VinB = 2, Vcc1 = 3 (12v), Vcc2 = 9 (25V), VoutA = 4, VoutB = 10, Gnd = 6.7, Ewin = 5, Ewout = 8
TDA9302 = see LA78040
Drive Stepper Motor with IC UCN5804
IC IC UCN5804 is designed specifically for the purpose of stepper motor drivers. Stepper motor driver IC UCN5804 with this very simple and uses only 2 additional components as current-limiting resistors which flows into the stepper motor, it also can be removed so that the stepper motor driver is a pure IC UCN5804 only use only. UCN5804 IC can be used for stepper motor driver with 5-20VDC voltage. Source voltage required for a series of stepper motor driver IC dengn this UCN5804 follow steppernya motor voltage. Picture a series of stepper motor driver ICs with UCN5804 in detail can be seen in the following figure.
Drive Stepper Motor circuit UCN5804
![Drive]()
In the series of stepper motor drivers with IC UCN5804 above to run a DC motor takes 2 inputs ie, the input signal and the input logic stepper direction of rotation. The input signal is a pulse stepper with a certain frequency where the frequency of these pulses that determines the speed of stepper motor puter. Then the input logic is a stepper motor rotating direction input logic 0 and 1 that is given to the IC UCN5804 to adjust the stepper motor rotating direction.
Continue reading[...]
Drive Stepper Motor circuit UCN5804
In the series of stepper motor drivers with IC UCN5804 above to run a DC motor takes 2 inputs ie, the input signal and the input logic stepper direction of rotation. The input signal is a pulse stepper with a certain frequency where the frequency of these pulses that determines the speed of stepper motor puter. Then the input logic is a stepper motor rotating direction input logic 0 and 1 that is given to the IC UCN5804 to adjust the stepper motor rotating direction.
555 Timer IC Working Principle
 |
Block Diagram of 555 timer IC: |
Comparator 1 has a threshold input (pin 6) and a control input (pin 5). In most applications, the control input is not used, so that the control voltage equals +2/3 VCC. Output of this comparator is applied to set (S) input of the flip-flop. Whenever the threshold voltage exceeds the control voltage, comparator 1 will set the flip-flop and its output is high. A high output from the flip-flop saturates the discharge transistor and discharge the capacitor connected externally to pin 7. The complementary signal out of the flip-flop goes to pin 3, the output. The output available at pin 3 is low. These conditions will prevail until comparator 2 triggers the flip-flop. Even if the voltage at the threshold input falls below 2/3 VCC, that is comparator 1 cannot cause the flip-flop to change again. It means that the comparator 1 can only force the flip-flop’s output high.
To change the output of flip-flop to low, the voltage at the trigger input must fall below + 1/3 Vcc. When this occurs, comparator 2 triggers the flip-flop, forcing its output low. The low output from the flip-flop turns the discharge transistor off and forces the power amplifier to output a high. These conditions will continue independent of the voltage on the trigger input. Comparator 2 can only cause the flip-flop to output low.
From the above discussion it is concluded that for the having low output from the timer 555, the voltage on the threshold input must exceed the control voltage or + 2/3 VCC. They also turn the discharge transistor on. To force the output from the timer high, the voltage on the trigger input must drop below +1/3 VCC. This also turns the discharge transistor off.
A voltage may be applied to the control input to change the levels at which the switching occurs. When not in use, a 0.01 nano Farad capacitor should be connected between pin 5 and ground to prevent noise coupled onto this pin from causing false triggering.
Connecting the reset (pin 4) to a logic low will place a high on the output of flip-flop. The discharge transistor will go on and the power amplifier will output a low. This condition will continue until reset is taken high. This allows synchronization or resetting of the circuit’s operation. When not in use, reset should be tied to +VCC.
LED Flasher Circuit Using 555 Timer IC
This is a simple LED flasher project that uses a common 555 timer IC for its operation. It is configured as an astable mode which means that its output is a square wave oscillator. Two LEDs are connected to its output in such a way that when one LED is ON, the other LED will turn OFF.
It uses only 10 simple parts that are easily available at any electronic shops. Capacitor C2 charges exponentially through resistors R1, R2 and the resistance of the trimpot. When C2 has charged to about 2/3 VCC it stops charging and it discharges to about 1/3 VCC through R2 and the trimpot resistance via pin 7. This is the standard operation of a 555 timer. When a Vcc of 5 V to 15 V DC is applied to the circuit, the LED will start to flash.
The frequency of the flashing can be changed by varying the resistance of the potentiometer or trimpot.Parts List The parts list of the simple LED project is as shown below.
Ramp Generator With 555 Timer IC
Charging current produced by PNP constant current source is
iC = Vcc-VE / RE
where VE = R2 / (R1 + R2) * VCC + VBE
When a trigger starts the monostable multivibrator timer 555 as shown in figure, the PNP current source forces a constant charging into the capacitor C. The voltage across the capacitor is, therefore, a ramp as illustrated in the figure. The slope of the ramp is given as
IC 7805 7905 based Power Supply 5V to 25V 5V to 25V 1A
Here is Circuit Power Supply Regulator Adjustable Voltage Output +5 to +25V, -5V to -25V 1A ,Use IC 7805 for +Vout and IC 7905 for -Vout.
VR1 for Adjustable + Volt output,VR2 for adjustable -volt output.
Basic IC MonoStable Multivibrator
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Basic LM555 Timer CIRCUITPart List
C2 = .01uf
IC1 = LM555 Timer
SWI = n.o. momentary switch
R1 and C1 determine lenght of
out put pulse where t = R1 x C1
and R1 is in ohms and C1 is in farads .
Shortwave SW Transmitter Based IC BEL1895
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Here the SW transmitter circuit based on IC BEL1895. This particular transmitter circuit works in shortwave HF band (6 MHz to 15 MHz), and can be applied for shortrange communication and for educational purposes.
Shortwave (SW) Transmitter Circuit diagram :
The circuit is composed of a mic amplifier circuit, a variable frequency oscillator, and modulation amplifier stages. Transistor T1 (BF195) is put to use as a simple RF oscillator. Resistors R6 and R7 determine base bias, while resistor R9 is utilized for stability. Feedback is provided by 150pF capacitor C11 to maintain oscillations. The primary of shortwave oscillator coil and variable condenser VC1 (365pF, 1/2J gang) form the frequency determining network.
By altering the coil inductance or the capacitance of gang condenser, the frequency of oscillation can be modified. The carrier RF signal from the oscillator is inductively coupled through the secondary of transformer X1 to the next RF amplifier-cum-modulation stage assembled around transistor T2 that is run in class ‘A’ mode. Audio signal from the audio amplifier assembled around IC BEL1895 is coupled to the emitter of transistor 2N2222 (T2) for RF modulation.
IC BEL1895 is a monolithic audio power amplifier intendeded for sensitive AM radio applications. It can deliver 1W power to 4 ohms at 9V power supply, with low distortion and noise characteristics. Since the amplifier’s voltage gain is of the order of 600, the signal from condenser mic can be straightly linked to its input without any amplification.
The transmitter’s stability is managed by the quality of the tuned circuit parts as well as the degree of regulation of the supply voltage. A 9V regulated power source is required. RF output to the aerial consists of harmonics, because transistor T2 doesn’t have tuned coil in its collector circuit. However, for short-range communication, it does not create any trouble. The harmonic content of the output may be lowered by means of a high-Q L-C filter or resonant L-C traps tuned to each of the prominent harmonics. The power output of this transmitter is about 100 milliwatts.
Drinking Water Alarm Using by IC LM555
The State Jal Boards supply water for limited duration in a day. Time of water supply is decided by the management and the public does not know the same. In such a situation, this water alarm circuit will save the people from long wait as it will inform them as soon as the water supply starts.
Drinking Water Alarm Using by IC LM555
![]( "Alarm")
Drinking Water Alarm Using by IC LM555
At the heart of this circuit is a small water sensor. For fabricating this water sensor, you need two foils—an aluminium foil and a plastic foil. You can assemble the sensor by rolling aluminium and plastic foils in the shape of a concentric cylinder. Connect one end of the insulated flexible wire on the aluminium foil and the other end to resistor R2. Now mount this sensor inside the water tap such that water can flow through it uninterrupted. To complete the circuit, connect another wire from the junction of pins 2 and 6 of IC1 to the water pipeline or the water tap itself. The working of the circuit is simple.
Timer 555 is wired as an astable multivibrator. The multivibrator will work only when water flows through the water tap and completes the circuit connection. It oscillates at about 1 kHz. The output of the timer at pin 3 is connected to loudspeaker LS1 via capacitor C3. As soon as water starts flowing through the tap, the speaker starts sounding, which indicates resumption of water supply. It remains ‘on’ until you switch off the circuit with switch S1 or remove the sensor from the tap. The circuit works off a 9V battery supply. Assemble the circuit on any general-purpose PCB and house in a suitable cabinet. The water sensor is inserted into the water tap. Connect the lead coming out from the junction of 555 pins 2 and 6 to the body of the water tap. Use on/off switch S1 to power the circuit with the 9V PP3 battery.
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