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Total Found: 87
Electronic counter with automatic counting interface circuit a
Electronic calculator with automatic counting of the interface circuit shown in Figure. Figure (a) stroke switch so via optocoupler B control; Fig. (B) the use of reed KR and p
Optocouplers MOC304 dimming control circuit diagram
Dimming control circuit as shown in FIG. Single-chip I/O port sinking method to achieve control thyristor switch and dimming control. MOC3041 optocoupler with internal zero-cro
Optical coupling electrocardiogram measuring instrument circuit
Tuner universal optocoupler should be on the electrocardiograph use, it is a typical circuit is shown in Figure 5-29. Circle O,
Oscillation circuit optocoupler control
It shows the oscillator circuit optocoupler controlled by photoelectric coupling drive transistor.
Light Chaser I
Up to 100 lights, LEDs, or optocoupler triac circuits can be sequentially activated by this circuit. One (Ul) 4017 decode co
Linear optocoupler for instrumentation
A dual optocoupler is used in a configuration which has the same current throughout as the LEDs. Assuming similar optocoupler features the output voltage must be equal to the non-inverting input voltage. Since the op amp is within a closed loop the output voltage becomes equal to the input voltage.
Since standard CMOS logic operates down to 3-V supply voltages and is specified as low as 30 p.A maximum current sinking/sourcing capability, it is necessary to use a buffer transistor to provide the required current to the IRED if CMOS is to drive the optocoupler. As in the case of the low output TTL families, the H74A output can drive a...
A circuit stabilizes the current-transfer ratio (CTR) of an optically coupled isolator used as a linear transducer. The optocoupler produces a voltage output that is proportional toâ€”but electrically isolated fromâ€”the voltage input. However, the output voltage is directly affected by changes in the CTR, and the CTR can change substantially...
This amplifier employs a cascaded op amp integrator and transistor buffer, Q1, to drive the gain control element. Except for a simple modification, the HA-5190/5195 stage is connected as a conventional noninverting op amp, and includes input and output impedance matching resistors R1 and R4, respectively, series stabilization resistor RZ,...
A small neon lamp is triggered into conduction by the telephone's ringing voltage, passes just enough current to activate the LED in optocoupler Ul, which in turn triggers the 6-A Triac that controls 12â€”a 117-Vac lamp or bell. (Capacitor Cl is necessary only when the circuit is used to drive a bell.) The lamp will flash off-and-on at the...
Speed regulator for dc motors
A four thyristor controlled bridge is used for operation in two quadrants of the torque-speed characteristics. In the trigger circuits the usual pulse transformers were replaced by self biased circuits which minimize gate power consumption and increase noise immunity. Electrical isolation is guaranteed by the use of optocouplers. The trigger...
When the phone rings, the ring signal from the telephone company lights a neon lamp within a CLM3120 optocoupler. That causes a drop in the resistance of the CdS cell output of the device, turning on transistor Ql.
This circuit functions as a wideband adjustable AGC amplifier. With an effective bandwidth of approximately 10 MHz, it is capable of handling rf input signal frequencies from 3.2 to 10 MHz at levels ranging from 40 mV up to 3 V pk-pk. AGC action is achieved by using optocoupler/ isolater OC1 as part of the gain control"feedback loop.
In this circuit, a TU31 shunt regulator is used to sense the output voltage. The TU31 drives the LED of a 4N28 optocoupler which provides feedback to the MAX641 while maintaining isolation between the input, +12 V, andJhe output, +15 V.
The piezo transducer operates as a sound-pickup device as well as a frequency-selective filter. By controlling the gain of the op amps, the oscillator can be transformed into a sensitive and frequency-selective tone-decoder circuit. With the gain of U1a set just below the point of self oscillation, the transducer becomes sensitive to...
When digital data is transmitted over long lines (longer than 1 meter), proper transfer is often disturbed by the parasitic effects of ground level shifts and ground loops, as well as by extraneous noise picked up along the way. An optocoupler, such as the HilL, combining galvanic isolation to minimize ground loop currents and their...
Electrical isolation for the I2C bus with optocouplers
When the lines SDA (Serial DAta) and SDA 'are logical '1', the circuit is at rest with the result that optocouplers IC 1 and IC2 can not convey absolutely no information. But once the SDA line become the 'O', then the LED the IC 1 becomes conductive through the resistor R2. At that time the line SDA 'and it becomes reasonable' O 'because of...
Microprocessor triac array driver
In microprocessor control of multiple loads, the minimum cost per load is critical. A typical application example is a large display involving driving arrays of incandescent lamps. This circuit provides minimal component cost per stage and optocoupler triggering of triac power switches from logic outputs. The minimal component cost is attained...
Mains Failure Indicator
When the mains voltage is present at the input terminals, the transistor in the optocoupler is on, T1 is off, and s
Outdoor Light Controller Circuit
A neon bulb and a CdS photocell enclosed in a light-tight enclosure form an optocoupler. A diac/triac combination is used to provide the snap- switch effect. A second CdS photocell acts as the main sensor. As darkness approaches, the resistance of K4 begins to increase. At a threshold level, the ciiac triggers the triac and causes the neon bulb...
Dc linear coupler
The accuracy of direct linear coupling of analog current signals via an optocoupler is determined by the coupler linearity and its temperature coefficient. Use of an additional coupler for feedback can provide linearity only if the two couplers are perfectly matched and identically biased. These are not practical constraints in most equipment...
Frequency/Voltage Converter With Optocoupler Input
In this circuit, the input from IC2 optocoupler is fed to the comparator input of the AD
Light Chaser Ii
Up to six lights can be sequentially flashed using this circuit. LED1 through LED6 can be replaced by optocouplers (MOC3010
Optoisolator And Optocoupler Interface circuits
A circuit for isolating a variable resistor is shown. An optoisolator that has an LED arid a photo-conductive cell (or photoresistor) is used. The current through the LED controls its brightness, which in turn determines the resistance between terminals A and B. The LED current is set by the voltage of the dc power supply and the value of the...
Overvoltage protection circuit diagram
As shown in FIG circuit protection circuit is the use of optocouplers or not the on-off control. Voltage is normal, almost no output optocouplers, VT pipe is reverse biased and
Touch the socket circuit diagram
Circuit as shown, with a touch of a finger when the metal sheet S, N neon tube light, since N and photoresistor RG constitute optocouplers make RG resistance becomes smaller, s
Lamp touch switch circuit diagram
Circuit principle as shown, neon tubes N1, N2 and photosensitive resistance RG1 constitute an optocoupler. When touching the metal sheet S1 with a finger, N1 light, so RG1 resi
Telephone control automatic lamp circuit 2
By phone automatically when the lamp base circuit NE555 and optocouplers constituted a call at night, light will automatically light up, hang up delay imi. About, self-extingui
DK04 monitoring module with the computer communications interface circuits
As shown in FIG, D187 is a universal asynchronous receiver transmitter (UART), its RX/TX signal received optocoupler N21, the N22 and N29, so put the RS-485 communication inter
Anti-theft car audio system circuit diagram
Anti-theft car audio system circuit is shown, which is taken from the car battery 12V DC power supply. When after closing the switch S1. Optocoupler IC1 light emitting diode is
Optocouplers and transistors of the bistable circuit diagram
As shown by the bistable circuit and optocoupler transistor of FIG. In the initial state the moment the supply voltage is turned on, the transistor VT off, the circuit outputs
Christmas lights consisting of a circuit diagram of optocoupler
As shown is a very attractive Christmas lights circuit. When the power is turned on, lights HL will gradually become brighter; when it reaches the brightest, it will automatica