The CDB, CDB, and CDB types are supplied in lead hermetic dual-in-line ceramic packages (F3A suffix), lead dual-in-line plastic. Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . These quad gates are monolithic complementary MOS. (CMOS) integrated circuits constructed with N- and P-chan- nel enhancement mode transistors They .
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The CDBC and CDBC quad gates are monolithic complementary MOS (CMOS) integrated circuits con- structed with N- and P-channel enhancement. CD, CD Datasheet, CD Quad 2-input NOR gate Datasheet, download CD Dec 10, Table 4. Limiting values. In accordance with the Absolute Maximum Rating System (IEC ). Voltages are referenced to VSS = 0 V (ground).
Data sheet acquired from Harris Semiconductor. Office Distributors for availability and specifications. With that given in data sheets. Engineering Program datashheet accredited by: Prices are subject to change without notice.
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This ratio usually appears in data sheets in units of dB. To see a list of open positions, click here. Welcome to the ECE Store. Datasheet, Download CD datasheet. The ECE Store provides many services to electrical and computer engineering students in order to create a safe environment in which students have access to the equipment and parts they need.
When the output voltage is 5v, the controller turns off and the only load on the 1u is the controller. When the voltage drops across this capacitor, the controller turns on in bursts to keep the 1u charged to exactly 5v. It also comes with 4 adapter leads! The controller has been placed on extension wires to test its operation. Sometimes it is better to use something that is already available, rather than trying to re-invent the wheel. This is certainly the case with this project.
You could not download the components for the cost of the complete phone The LED and 1u capacitor can be clearly charger and extension leads. The circuit will deliver 70mA at 5v and if a higher current is drawn, the voltage drops slightly. They form a LATCH to keep the oscillator made up of the next two gates in operation, to drive the speaker. This turns on the oscillator and the 10u starts to charge via the k resistor. If the current requirement is less than mA, a R "safety resistor" can be placed on the 24v rail to prevent spikes damaging the regulator.
The only difference is the choice of chips. It flashes a LED for 20 seconds after a switch is pressed. In other words, for 20 seconds as soon as the switch is pressed. The values will need to be adjusted to get the required flash-rate and timing.
As both microphones and loudspeakers are always connected, the circuit is designed to avoid feedback - known as the "Larsen effect". These are mixed by the 10u, 22u, 20k pot and 2k7 so that the two signals almost cancel out. In this way, the loudspeaker will reproduce a very faint copy of the signals picked-up by the microphone. The same operation will occur when speaking into the microphone of the second unit. When the 20k pot is set correctly, almost no output will be heard from the loudspeaker but a loud and clear reproduction will be heard at the output of the other unit.
The second 20k pot adjusts the volume. When the phone rings for 3 or 4 rings, the relay is activated for about 1 minute. But if the phone rings for 6 or more rings, the circuit is not activated. The circuit takes less than uA when in quiescent state and when the phone rings, the ring voltage is passed to pin 1 via the k and n capacitor.
This causes pin 2 to go HIGH and charge two u electrolytics. The lower u charges in 7 seconds and the upper charges in 12 seconds. If the phone rings for only 3 rings, pin 4 goes LOW and charges the third u via a 47k resistor. After a further 7 seconds, pin 10 goes HIGH. If the phone stops ringing after 3 rings, the lower u starts to discharge via the k and after about 40 seconds pin 4 goes HIGH. The third u now starts to discharge via the k across it and the relay turns off.
The shorter steel rod is the "water high" sensor and the longer is the "water low" sensor. When the water level is below both sensors, pin 10 is low. If the water comes in contact with the longer sensor the output remains low until the shorter sensor is reached.
EE Lab Manualpdf - Fig Two-input AND gate using
At this point pin11 goes high and the transistor conducts. The relay is energized and the pump starts operating. When the water level drops the shorter sensor will be no longer in contact with the water, but the output of the IC will keep the transistor tuned ON until the water falls below the level of the longer rod.
When the water level falls below the longer sensor, the output of the IC goes low and the pump will stop. The switch provides reverse operation. Switching to connect the transistor to pin 11 of the IC will cause the pump will operate when the tank is nearly empty and will stop when the tank is full. In this case, the pump will be used to fill the tank and not to empty it. Note: The two steel rods must be supported by a small insulated wooden or plastic board. The circuit can be used also with non-metal tanks, provided a third steel rod having about the same height as the tank is connected to the negative.
Adding an alarm to pin 11 will let you know the tank is nearly empty. This occurs in the circuit when the gate is LOW. Ideally the PNP transistor should be replaced with a Darlington transistor. The length of activation depends on the value of the resistor across the 10u electrolytic.
Pin 2 will be kept LOW and the 10u will discharge via the resistor across it and eventually pin 3 will go LOW and the relay will turn off. If a signal is still present on the base of the input transistor, the relay will remain energised as the circuit will charge the 10u again.
The original design was bought over 40 years ago, before the introduction of the electret microphone. They used a crystal earpiece. We have substituted it with a piezo diaphragm and used a quad op-amp to produce two building blocks. The first is a high-gain amplifier to take the few millivolts output of the piezo and amplify it sufficiently to drive the input of a counter chip.
This requires a waveform of at least 6v for a 9v supply and we need a gain of about The other building block is simply a buffer that takes the high-amplitude waveform and delivers the negative excursions to a reservoir capacitor u electrolytic. The charge on this capacitor turns on a BC transistor and this effectively takes the power pin of the counter-chip to the positive rail via the collector lead. The chip has internal current limiting and some of the outputs are taken to sets of three LEDs.
The chip is actually a counter or divider and the frequency picked up by the piezo is divided by and delivered to one output and divided by over 8, by the highest-division output to three more LEDs The other lines have lower divisions.
This creates a very impressive effect as the LEDs are connected to produce a balanced display that changes according to the beat of the music. The voltage on the three amplifiers is determined by the 3M3 and 1M voltage-divider on the first op-amp.
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It produces about 2v. This makes the output go HIGH and it takes pin 2 with it until this pin see a few millivolts above pin3. At this point the output stops rising. Any waveform voltage produced by the piezo that is lower than the voltage on pin 3 will make the output go HIGH and this is how we get a large waveform.
This signal is passed to the second op-amp and because the voltage on pin 6 is delayed slightly by the n capacitor, is also produces a gain. When no signal is picked up by the piezo, pin 7 is approx 2v and pin 10 is about 4. Because pin 9 is lower than pin 10, the output pin 8 is about 7. The LED connected to the output removes 1. Any colour LEDs can be used and a mixture will give a different effect. Click the link above for more details on the project, including photos and construction notes.
The flashing LED takes almost no current between flashes and thus the clock line is low via the 1k to 22k resistor. When the LED flashes, the voltage on the clock line is about 2v -3v below the rail voltage depending on the value of the resistor and this is sufficient for the chip to see a HIGH. Sw1 is pressed for a brief period. This charges the 47u and the 1u is charged via the k.
The voltage on the 1u rises until it puts a HIGH on input pin It is charged by the k and discharged by the 10 and diode. The HIGH on pin 2 allows the 1u to charge via the k and this gradually reduces the voltage on the 47u. As the voltage on the 47u falls, the time taken to charge the 1u increases and creates the slow-down effect. Test 2: You now now the base lead and the type of transistor. Place the transistor in Test 2 circuit top circuit and when you have fitted the collector and emitter leads correctly maybe have to swap leads , the red or green LED will come on to prove you have fitted the transistor correctly.
The value of gain is marked on the PCB that comes with the kit. The kit has ezy clips that clip onto the leads of the transistor to make it easy to use the project. The project also has a probe at one end of the board that produces a square wave - suitable for all sorts of audio testing and some digital testing.
Adjust the 5k pot for The plug pack will need to be upgraded for the mA or 1. The red LED indicates charging and as the battery voltage rises, the current-flow decreases. The output has an active buzzer that produces a beep when the pulse LED illuminates. The buzzer is not a piezo-diaphragm but an active buzzer containing components. It is called an electro-mechanical buzzer as it has two coils. The main coil pulls the diaphragm to the core via a transistor and the feedback coil drives the base.
When the transistor is fully saturated, the feedback winding does not see any induced voltage and current and the transistor turns OFF. The rapid action of this oscillator produces an annoying squeal. When relay 1 turns off, relay 2 turns ON for any period of time as determined by C2 and R2.
When relay 2 turns off, relay 1 turns ON and the cycle repeats. He wanted 4 pumps to operate randomly in his water-fountain feature.
A 74C14 IC can be used to produce 4 timing circuits with different on-off values. The trim-pots can be replaced with resistors when the desired effect has been created. A flip-flop is a form of bi-stable multivibrator, wired so an input signal will change the output on every second cycle. In other words it divides halves the input signal. When two of these are connected in a "chain" the input signal divides by 4. The CD IC has 14 stages. The IC also has components called gates or inverters on pins 9,10 and 11 that can be wired to produce an oscillator.
Three external components are needed to produce the duration of the oscillations. In other words the frequency of the "clock signal. Each stage rises and falls at a rate that is half the previous stage and the final stage provides the long time 13 delay as it takes 2 clock cycles before going HIGH. We have only taken from Q10 in this circuit and the outline of the chip has been provided in the circuit so different outputs can be used to produce different timings.
The diode on the output "jams" the oscillator and stops it operating so the relay stays active when the time has expired. Ladybug automatically makes a left turn the moment it detects an object in its path. It continues to move forward again when no obstacle is in the way. See Hex Bug in " Transistor Circuits" for a transistor version of this circuit.
It is only suitable for low frequency signals such as audio but can also reproduce low-frequency square waves. It's fun to talk into the microphone and see the result on the screen. To see a trace across the centre of the screen.
The audio will raise and lower the trace to produce a waveform.
The photo on the right shows the authors model. Scan rate of k samples per second for effective maximum frequency of 15kHz. Operates from a single supply and can even be powered off a single 9V battery.
Two voltage scales and a full range voltage offset allows measurement of AC and DC signals. A very interesting kit and great educational value. Preset VR1 is fine-tuned to get 0. At the same time, pulses obtainable from pin 1 will be of 1. Working with a built-in oscillator-type piezo buzzer generates about 1kHz tone. Just after a time interval of 0. This is followed by two seconds of no sound interval. Thereafter the pulse pattern repeats by itself.
It can be adjusted to give the desired speed for the display. The output of the is directly connected to the input of a Johnson Counter CD The 10 outputs Q0 to Q9 become active, one at a time, on the rising edge of the waveform from the Each output can deliver about 20mA but a LED should not be connected to the output without a current-limiting resistor R in the circuit above.
The first 6 outputs of the chip are connected directly to the 6 LEDs and these "move" across the display. The next 4 outputs move the effect in the opposite direction and the cycle repeats. The animation above shows how the effect appears on the display. Using six 3mm LEDs, the display can be placed in the front of a model car to give a very realistic effect. The same outputs can be taken to driver transistors to produce a larger version of the display. The outputs are "fighting" each other via the R resistors except outputs Q0 and Q5.
The battery voltage for a car can range from 11v to nearly 16v, depending on the state-of-charge and the RPM of the engine. This circuit provides constant current so the LEDs are not over-driven. When the first IC turns off, the n is uncharged because both ends are at rail voltage and it pulses pin 2 of the middle LOW. This activates the and pin 3 goes HIGH. This pin supplies rail voltage to the third and the two red LEDs are alternately flashed.
The circuit consumes about 30mA when sitting and waiting.
The circuit consumes less than 1mA. If the battery voltage is 12v, the circuit will deliver about 9v at 20mA. The regulator has an internal voltage reference of 1. As the current required by the circuit increases, the voltage across this resistor will increase. When it is 1. If the current increases due to the output resistance decreasing, the voltage across the resistor increases and the LN reduces the output voltage.
This causes the current to reduce to 20mA. This is how the circuit produces a constant current. The output current can be changed to any value according to the formula shown below. The current will also depend on the rating of the plug pack. As soon as the current reaches the limit set by the R pot, the BC transistor starts to turn on and rob the regulator of voltage on the Adj pin.
The output voltage starts to reduce. If the output is shorted, the output voltage will reduce to almost zero. Mains wiring must not be touched. Many CMOS chips can be used for this purpose. CD , , as they all have very sensitive inputs.
This circuit will also detect "Mains Hum. Use a small length of copper-clad PC board 1cm wide for the detector. The LED will flash when the antenna is 10cm to 15cm from the cable. THE 74c14 IC - also known as or - it works on 5v to 15v. They are TTL chips and operate on 4. When you realise its versatility, you will use it for lots of designs. In this section we describe its capability and provide circuits to show how it can be used.
Minimum supply voltage 5v Maximum supply voltage 15v Max current per output 10mA - 60mA total Maximum speed of operation 4MHz Current consumption approx 1uA with nothing connected to the inputs or outputs. The output of each gate will deliver about 10mA.
For up to mA, a BC can be used. For up to 4 amps a BD Darlington transistor can be used. There are 6 of the gates in the IC and they are all internally wired to the power rails.
You can think of the input as having infinite impedance resistance , so it does not put a load on anything connected to this pin. Here is an animation of how the gate works. The input has to be above mid-rail for the output to change and below mid-rail for the output to change back to its originals state. It does not matter if the capacitor is placed above or below the resistor as the time delay will be the same.
The only difference will be the value of the voltage at the beginning and end of the timing cycle. The join of the two components is the point where the voltage is detected and is called the "Detection Point.
This will be the input of one of the Schmitt gates. The detection circuit must not load the timing circuit.
CD IC based Lighting System
In other words the detection circuit must have a very high input impedance. That's the advantage of this IC. If we monitor the voltage across the capacitor, we can determine when it is at a particular voltage level. In the animation below we see the capacitor charging via a resistor, with a meter showing the approx voltage across the capacitor. The capacitor does not charge at a constant rate, but this characteristic does not concern us at the moment.
The point to remember is the TIME it takes for the capacitor to charge. Instead of the voltmeter monitoring the voltage across the capacitor, the input of the Schmitt Inverter can be connected to the capacitor. In this way we need only one gate to create an oscillator. There are two very important things to observe in the animation below. The output is a square wave. The animation below shows the gate in operation. You will notice that the diagram does not show the chip connected to the positive and negative rail.
Here are the basic oscillator blocks for a 74C14 IC: Fig A shows a capacitor - high frequency oscillator Fig B shows an electrolytic - low frequency oscillator An oscillator is created by placing a resistor from output to input and a capacitor from input to 0v. The output will be a square-wave and and the mark high will be equal to the space low.
The frequency of the output will depend on the value of R and C. Values of 1k to 4M7 for R and p to u for C can be used.
This is shown in circuits A and B above. If an unequal HIGH and LOW is required, a diode is placed between output and input: In figure C the output is output is low for a short period of time as the two resistors R1 and R2 are discharging the capacitor.
In figure D the diode is reversed compared to figure C and output is high for a short period of time as the two resistors R1 and R2 are charging the capacitor.
It can be detecting a piece of equipment being turned on, for example. This action charges capacitor C via resistor R. The Delay Time is determined by the values of R and C.
We are not concerned with the actual values of R and C at this point in time. They can be worked out by experimentation. If the output is required to be the opposite of the circuit above, an inverter is added: If a diode is added across the input resistor, the capacitor "C" will be discharged when the input goes low, so the "Delay Time" will be instantly available when the input goes HIGH: Pulse The following circuit produces a PULSE when the input line goes HIGH: To invert the output, add an inverter: To produce a pulse after a delay, the following circuit is required: Gating To gate an oscillator via another inverter, a diode is placed between the two gates: When the push-button is pressed, the input of the first gate goes LOW and the output goes HIGH.
The high from the diode prevents the capacitor discharging via the oscillator and it is "jammed" or "frozen" with the output LOW. The following circuit produces a tone for a short period of time as determined by the pulse section.
When the output of the Pulse section is LOW, the oscillator will operate. To extend the action of a push button, a pulse-extender circuit can be added: To produce a pulse of constant length, no matter how long the button is pressed , the following circuit is needed: To produce a TOGGLE SWITCH, the following circuit is needed.
The input of the has a microscopic current availability and over a period of a few hours it will charge the n and cause the circuit to re-trigger. That's why the 4M7 is needed. The push-button produces a brief LOW on pin 1, no matter how long it is pushed and this produces a pulse of constant length via the three components between pin 2 and 3.
This pulse is long enough to fully discharge the u timing electrolytic on pin 5. The k and electrolytic between pins 6 and 9 are designed to produce a brief pulse to energize the relay. Here is another very similar circuit. Produces a 0. In the following design, the output produces 3mS pulses every second. The circuit is adjustable to a wide range of requirements.
This circuit pulses the pager motor about 2 - 4 seconds after the circuit is turned on: The following circuit allows a higher voltage to be used and PWM controls the energy to the Pager Motor. The feedback diode from the output prevents the inputs re-triggering the timer during the delay period the so that a device such as a motor, globe or voice chip can be activated for a set period of time.
The alarm keeps wailing if the door is kept open.
Use one of the two inputs as the variable input and
It only turns off after minutes when the door is closed.Some of the circuits are available from Talking Electronics as a kit, but others will have to be downloadd as individual components from your local electronics store. The k and electrolytic between pins 6 and 9 are designed to produce a brief pulse to energize the relay.
The values will need to be adjusted to get the required flash-rate and timing. You can use a zener, LEDs and a signal diode to adjust the voltage to any desired value. To extend the action of a push button, a pulse-extender circuit can be added: To produce a pulse of constant length, no matter how long the button is pressed , the following circuit is needed: To produce a TOGGLE SWITCH, the following circuit is needed.
Fairchild reserves the right at any time without notice to change said circuitry and specifications. The main coil pulls the diaphragm to the core via a transistor and the feedback coil drives the base.