Popular Circuits Page 261
- Page 261
-
Here is police tone circuit of siren. this simple and very easy to make it. vr 1 and vr 2 for change delay sound of siren. simple and easy. if sound output not...
-
-
This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3.6 volt Lithium - Ion recharable cell phone battery. The reference voltage is provided by a TL431 programmable voltage source which is set to 3.9 volts....
-
The circuit diagram shown here is a simple circuit DC power delay, which is based on an SCR (Silicon-Controlled Rectifier). This circuit is very useful and can be used in many applications. The operation of this circuit is very simple. When input power is....
-
This circuit is designed to provide delayed relay switching action at power on. The delay is a function of the time constant produced by the combination o....
-
-
A Pair of Push-Pull Class A, Ultra Linear Mono Block Tube Amplifiers that can be used with several different vacuum tubes including KT77 / 6L6GC / KT88 with a 12SL7 driver and 6NO30 tubes...
-
-
-
Dynamic‚ip-‚ops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to capturing noise pulses having unknown durations and magnitudes. Anyone who has ever tried to observe very....
-
DC Servo Motor Driver kit, designed using MC33030 IC, is the fastest and low cost way of getting your DC Servo Motor up and running...
-
This AC Power Monitor continuously watches the AC power line voltage for both under-voltage and missing cycles. When it detects a total of 5 or 6 consecutive missing half-cycles (50mS, 50/60HZ), it drops a relay and starts a timer. A power contactor is....
-
Figure 4-20 is HAD250A-3 active speakers and amplifier circuit integrated amplifier circuit LM3886 thereof. The circuit uses 25V power supply, output power up to 50w 2, to meet..
-
-
Second order band-pass filter performance depends primarily on the quality factor Q and center frequency Si. In order to adjust the Q and. t a general first adjust R3 to change the Q value, and then adjust to change C 0. But the adjustment will affect R3 Si...
-
It can`t be 0 volts, since the current does not freely move around, due to the resistor; resulting in one side being more negatively charged, and the other more positively charged, since the electrons can move faster to an end of the battery than through the....
-
how do I build a circuit for digital dead out of 3 phase power consumption in home using any chip like ADE7762 ? I am interested in Polyphase Energy Metering using a....
-
This schematic is a tone transmitter. For sufficiently small values of the resistor, it outputs a tone, so having a resistive mic (carbon mic) in parallel with or in place of the resistor. would modulate the tone frequency with the voice. I`m not sure how....
-
This circuit is designed to provide an inexpensive way to to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multimeter. When measuring voltages in high resistance circuits the resistance of the voltmeter itself has an....
-
This new circuit uses four chips, with an option of using just three (the flip-flops and AND g..
-
-
-
A radio camera on a model railway should transmit constantly while the train is moving and continue transmitting for a few minutes after the train stops. But if the train starts up again after a relatively long halt, imagery should be transmitted....
-
This Design Idea outlines an easy-to-implement time-delay routine that requires no subroutine calls and thus avoids possible stack-overflow problems (Listing 1). This method also saves RAM space by requiring in most cases only two variables: the PACER_CLOCK....
-
Using Wuxi love core Microelectronics Co., Ltd. H1.9811 single Chan flash control integrated road barricades made of flashing warning lights, HL9811..
-
This project is developed to control up to 50 solid state relays individually. The project is good learning material for students who which to expand the input output lines of microcontroller and want to control many devices. 2. The ON or OFF status of each....
-
Good information about RF Field Strength Meter Circuit. You can learn and download RF Field Strength Meter Circuit online here....
-
This circuit for a test set contains a signal injector (U1A/U1B) and associated com..
-
The circuit voltage 9V, current consumption is only 5mA, the home can be adjusted within the range of 150 ~ 180kHz frequency,..
-
Assembly is very straight forward, just follow the PC board overlay. Make sure you get the integrated circuit and the electrolytic capacitors the correct way around. The electrolytic capacitors are polarized, they have a + or - marked on them and they must....
-
-
This figure shows a one-of-two switch with a sunnning amplifier. The video source"s line can be terminated either externally or internally to switch RO. With this termination resistor, a load change of less than 1 0 will be seen by the source when the....
-
To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an amplifier more powerful than the 25W MosFet, a 60 - 90W High Quality power amplifier design is presented here. Circuit topology is about....
-
This is a design circuit for a doorbell. This circuit can produces a sound like bird sound. This circuit controlled by transistor NPN. This is the figure of the circuit. The operation of the circuit is beginning when P1 is of experimental value. Start with....
-
This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or for switching on a lamp at Sun set and off at Sun rise. Potentiometer R1 value must....
-
This circuit uses a sync-generator chip, a counter, and a decoder to detect the horizontal sync pulse that occurs a..
-
Anti-log or exponential generation is simply a matter of rearranging the logarithmic circuitry. The circuit diagram below shows the circuitry of the log...
-
The frequency is controlled by the pin 5 of the IC. When the supply is switched ON, the capacitor charges slowly and this alters the voltage at pin 5 of the IC hence the frequenct gradually increases. After the capacitor is fully charged, the frequency no....
-
The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginni...
-
-
This 1000 watt power inverter circuit diagram based on MOSFET RF50N06. If you want more power then add additional MOSFET paralleled at RF50N06. This MOSFETS are 60 Volts and 50 Amps as rated. It is necessary to connect a FUSE with the power line and always a....
-
A relatively simple attachment to my Canon SLR to create a motion activated camera using Arduino. A lot of this was based on and inspired by the intervalometer project at The Honey Jar. I made some changes to his circuit to use a 4N35 optocoupler instead of....
-
The first schematic is for those who never buy parts anywhere but Radio Shack. You can walk in the store and walk out with all the electronics that you need. For the heat sink, sorry to say, you`re on your own. Find a hardware store and buy a big chunk of....
-
It is a complex component to say the least. It is as if it is composed of 3 caps being 2 virtual plus the known cap itself. On my first graph I am showing the log of the progess of the running and sucessfull version shown on my youtube videos. Voltage is....
-
The project is "Motorized Curtain" with Remote control. It is made up of MCU ATMEGA328 with Arduino BootLoader, motor driver L293D ( i used L293B with external diodes, because i couldn't find L293D ), IR Receiver TSOP 1738, DC Motor from an old printer and....
-
The post explains a simple delay ON circuit which allows the connected load at the output to be switched ON with some predetermined delay after power switch ON. The explained circuit can be used for all applications which calls for an initial delay ON....
-
-
Wireless headphone transmitter receiver now widely available in the market with a variety of pricing options with a reliable technical specification for a variety of allocations which include wireless headphones for tv or tv headphones, wireless earbuds,....
-
A replication of Afrotechmods laser tripwire circuit. Using a simple laser pointer, IRF244 MOSFET ( most NPN transistors would do the job), a couple of resistors and one LDR..
-
The following circuit shows about Emergency Light With Battery Charger Circuit Diagram. Features:automatic switching-on of the light on mains ....
-
The circuit is a common form used in FM transmitters. The transistor conducts for 60-90 electrical degrees. When it turns off the LC tank `rings`, completing the sinusoidal waveform coupled to the antenna. The circuit is 77-85% effecient, compared to 40-50%....
-
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
-
Before you can design an adjustable voltage regulator into your circuit, or do a redesign, you need to calculate the values for two resistors. This is not difficult in itself, but actually finding the right resistors may pose problems. Fortunately a trick is....
-
One 1381 part (CMOS voltage-controlled trigger available at different limits) Get one that matches the voltage across your motor (2V in this case) 8. The other terminal of the motor is connected to the 3300uf capacitor which is in turn connected to the other....
-
Peripheral circuit is very simple, it is DAC schematic circuit diagram of the USB interface which adopts PCM2702 to make the picture, the Ausgang of circuit can be connected with the power amplifier directly, can drive earphone of more than 32 ohms too...
-
-
The 8052.com SBC is a single-board computer designed to be both useful and instructive in illustrating certain concepts commonly encountered in 8052-based development...
-
Typically applications having LEDs and keypads also
keep track of real-time, in order to synchronize certain
related events. An Industrial Clock/Timer example has
been used in this application note as a demonstration
of these functions. The software....
-
Tools that features equivalent of a professional, easy to use, cheaper, and more importantly, safe for use. For checking to find AC 220 Volt or 120V or call....
-
-
-
A summary of the varactor or varicap diode used in many radio frequency circuits to provide an electronically variable capacitance ..
-
This simple water level sensor circuit monitors the presence of water in a certain location or container. The circuit sends an acoustic alarm when it sense....
-
The circuit consists of four stages of active bandpass ftltering provided by two type A747 integrated-circuit dual op amps and includes a simple threshold detector (diodes D1 and D2) between stages 2 and 3 to reduce low-level background noise. Each of the....
-
Anti-jamming circuit (watchdog circuit): KA555 interference when analog baseband circuit shown in Figure 18-14. FIG D4 is KA555 hybrid analog/digital integrated circuits,, feet..
-
Many times, I have written code for UART communication and when it came to testing, my laptop does not have a serial port. I bought a USB to serial port converter but it didnt worked. I felt frustated and finally thought of buying a Serial to Com port module....
-
There are three switches that represent "binary number", and according to that switches` combination, number of lit LEDs change to represent that binary number. I am wondering how do provide equal current and voltage for LEDs and make them light up with....
-
1993 VW Passat Engine Control Module, Automatic Control Unit, and Automatic Solenoid Electrical Wiring Diagram are shown in the following figure. It shows the connection and wiring between each parts and component of Engine Control Module, Automatic Control....
-
A N2PK VNA that it would be useful for antenna measurements and wanted to run it with a laptop PC. As most newer laptops do not have a parallel port on them I decided to explore running it off the USB port. USB has its attractions when it works properly and....
-
Here`s the circuit diagram of a four RF stage FM transmitter. The stages are, very high frequency (VHF) oscillator built around a HF transistor BF494, a pre- amplifier built around transistor BF200, a driver transistor 2N2219 and a power amplifier using....
-
The op amp is alternately an inverter or buffer, under control of the switch polarity. As a buffer, the gai..
-
The monitoring circuit consists of four tri-color LEDs driven by an equal number of op amps configured as gain-of-one inverting amplifiers. Each LED is wired in the circuit so that it glows red when the input to the op amp is high, and green when the input....
-
This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
-
When Q1 is active, a larger current begins to flow through L1 to GND. When Q1 is switched off, the current through L1 trys to remain the same as it was, causing an increased voltage. By varying the PWM duty cycle, the current through L1 and output voltage....
-
Keyer dimmer table lamp adopts two touch buttons to adjust the light. The light changes weaken from strong when peopletouch one of the buttons, and it changes strong from weaken when peopletouch the other button. Working principle The principle of this....
-
In the "DSP" tab`s "Local Oscillator" section, click on the button marked "Single Band" and type in the desired center frequency (7046000). This sets Rocky`s center frequency at 7. 046 MHz. Set up your transceiver (or other signal source) to transmit a low....
-
-
-
In many discussions of LPAM transmitter design you will hear or read references to "the Wenzel circuit" or "the Wenzel transmitter. " These refer to the clever transmitter design downloadable at During the mid 1990s and early 2000s, this was the best....
-
-
This audio power amplifier uses two complementary MOSFETs (IRF9520 and IRF520) to deliver up to 20W into 8 © speaker. A TL071 op amp is used as an input amplifier. The MOSFETs should be heatsinked with a heatsink of better than 50C/ W capability. THD is less....
-
Electronic ignition circuit for the water heater is shown. When you open the faucet, switch K 3V battery, since the charging C2 need room, so VT6 is off, the power supply while..
-
-
This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. It`s designed to be used with the usual types of normally-closed input devices such as - magnetic reed contacts - micro....
-
By using the preamplifier with a short length of shielded cable and clip leads, signals that generally could not generate a readout, generate precise and stable readouts on the counter. The DPDT switch is used to bypass the circuit when amplification is not....
-
I had a Basic Stamp project that needed to measure a nominal 12 volt battery, and I wanted a simple solution. This is the simplest I could come up with. The 555 timer will put out positive pulses. The pulse width is inversely proportional to the difference....
-
This low-power NTSC video and sound transmitter is useful for amateur radio, video handle-talkie, R/C and surveillance pur-poses. A crystal oscillator-multip lier RI` power amplifier. Video modulation is via a three-transistor series modulator. The sound....
-
Most standard household appliances and portable hand tools can be adapted to variable -speed operation by use of this simple half-wave SCR phase control. It can be used as the speed control unit for the following typical loads pro-videe they use series....
-
In the datasheet, you will see the L200 application circuits diagrams such as Programmable Voltage Regulator, High Current Voltage Regulator with Short Circuit Protection, Digitally Selected Regulator with Inhibit, Programmable Voltage and Current Regulator....
-
Laptops today are the what is called notebook computers, which now is becoming popular. Laptops can be brought into the bag making it suitable for business trips. And even as the home entertainment center laptop is more convenient, because it takes a....
-
A very simple telephone broadcaster or transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this phone transmitter is that the circuit derives its....
-
Here, S1 and S2 are normally open , push to close, press button switches. The diodes can be
red or green and are there only to indicate direction. You may need to alter the TIP31 transistors
depending on the motor being used. Remember, running under....
-
Absolute shaft angle data serial-parallel conversion: the serial AD2S90 axis angle data is converted to parallel data method has many, timed digital pulse signal can be micropr..
-
-
Signal clipping is usually avoided in most application, but we can find some useful examples where clipping is intentionally employed in audio processing. One....
-
Here, S1 and S2 are normally open, push to close, press button switches. The diodes can be red or green and are there only to indicate direction. You may need to alter the TIP31 transistors depending on the motor being used. Remember, running under load....
-
In this experiment, an oscillator is constructed using an operational amplifier and some other passive elements. This configuration for the oscillator is called Wien Bridge. The frequency of the oscillator is determined by R4, R5, C1, and C2 elements. In....
-
-
One application of this handy circuit is a graphic equalizer, created by feeding a signal to a number of parallel band-pass filters each tuned to a different frequency; typically octaves apart. Then, you can adjust the strength in each band via a front panel....
-
This is an amplifier circuit using ic LM12 as the main amplifier. This amplifier has a 150Watt power output and has a 4 ohm impedance. These amplifiers have a classified high output power. The frequency response of 10Hz to 30KHz. Supply Voltage at least 9....
-
-
The design came from the interest of finding a new technique of analog to digital conversion. The two types of ADC (Analog to Digital Converter) that inspired me in the development of this circuit are Flash Type ADC and Successive Approximation Type ADC. The....
-