Popular Circuits Page 35
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The following circuit shows about BUZ902DP 300 Watt Audio Power Amplifier Circuit Diagram. Features: 20 Hz 20 kHz Audio Frequency Linearity, ....
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Below we will provide you with useful article information to produce your own specific oscillator or pulse generator from integrated circuits (ICs), resistors, and capacitors using no matter the version of the 555 IC..
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This Wideband DTV UHF Antenna TV Amplifier has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency....
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28 Pin Development board with built-in USB connection. Power and serial communications are provided by the FTDI USB RS232 converter chip. You don`t have to do anything! Connect the USB ....
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The problem is when i connect the 8051 to the encoder the data send is not received at the receiver but as soon as the 8051 connections are removed the transmisison works perfectly. thus manually the RF communication works perfectly i. e the 8 bit data which....
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Number of controls are required to be provided on a panel of CRO to facilitate its proper functioning. Intensity control is provided for adjustment of brightness of the spot on the screen. It is accomplished by varying the voltage between the first and....
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Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains....
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This is an a simple Tone Control Circuit using TDA1524A. Is the heart pillar in the work that is IC chip diagram of Philip. You can use a tone control or a portion of the lower portion of fines sound, treble and balance to get all setly can be extended by a....
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This circuit shows about TDA1054 For Tone Control Stereo Preamp Circuit Diagram. Features: National Semiconductor LM35 IC, use a semiconductor ....
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Hi I am currently working through the prototype of my first guitar pedal. I am having issues with the input buffer, and I would like someone to look....
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A common challenge for experimenters is increasing the gain of a low level DC voltage for recording or analysis. Most instrumentation circuits require building a complicated project with dual power supplies and high accuracy components. A simple solution is....
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The Model LM-13 Crystal Calibrated Frequency Indicating Equipment has been specially designed to provide a simple, accurate and reliable frequency indicating equipment of the crystal calibrated type for use in the (U. S. ) Naval radio service. It is....
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A very simple high efficiency switching power supply electronic circuit project can be designed using the LMZ13608 8A regulator. This 8A switching power supply regulator electronic project based on the LMZ13608 has an very high efficiency and require few....
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A typical representative of the dynamic noise reduction by the United States National Semiconductor first be successfully developed and integrated LM1894 (see Table 1-3), the u..
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Last year I built and reviewed the low cost Oatley Electronics K272 Tube Stereo Headphone Amplifier Kit. In conversation with Oatley Electronics (located in New South Wales Australia), they told me that the kit became very popular and sold pretty much all....
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how to interface an lcd to 89c51 using 4 bit mode. am using lampex16200 pls send me manual of this controller....
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The electret microphone has a current of 200uA which changes by +- 3 uA depending on sound waves. This sets the voltage across R1 to 2V and the voltage across the mic to 4 volts. As the sound hits the mic the current through R1 increases slightly reducing....
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As shown, the circuit uses a zener diode D1 achieve overvoltage protection, a diode rectifier bridge to achieve reverse voltage protection. Diodes 1.4V loop will cause the maxi..
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A method of boosting the output current of a reference and also protecting against overloads is shown..
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Electrical pulses generated by the first base circuit pin output, and then sent through R6 piezoelectric speaker BLD, switched to the electric pulse ultrasonic waves to space r..
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Microcontroller design where the mcu is placed in hibernation mode, and can only be awoken by a pulse(high-low-high) signal on the reset pin. (active low) As a wake-up source i`m using an accelerometer or an external RTC. The idea is to have the....
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Producing low-distortion sine waves, this oscillator operates over the range 16 to 22000 Hz....
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The MSF transmitter sends time data bit-by-bit over the 60 seconds of each minute by dropping the 60 kHz carrier. It`s a basic CW signal [1]. Two bits are transmitted every second by modifying the length and number of carrier drop(s) per second (see the....
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Using the FAN7710 Ballast Control IC for Compact Fluorescent Lamps developed using Fairchild s unique highvoltage process and system-in-package (SiP) conc....
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The nixie tube clock consists of a high voltage power supply, seven rings counters and an Atmel AVR processor. The power supply is shown in schematic Schematic 1. It takes 12 volts AC and converts it to DC which drives the Maxim 1771 switching power supply....
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Having done half a dozen V-USB tutorials I decided it`s time to whip up something cool. As USB keyboards were an area untouched, I decided to make a small USB HID keyboard device that types a password stored in EEPROM every time it`s attached. A new password....
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This one is actually a bit simpler to explain: the op-amp is set up with 25. 50x amplification, i. e almost a comparator (with 50x amplification, a 50 mV input above or below the 2. 5V will drive the output to its limit). And indeed, the output signal of the....
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An application, which is considered, of very good quality sound since the entrance transistors are working at Class A. The quality of sound depends to a large extent on IC1, which must be of good quality. It can be chosen from several IC with the best from....
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Circuit works: SC3525A for the US General Semiconductor PWM silicon chip, 1 foot of the error amplifier inverting input terminal,..
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The original scale on my voltmeter was from 0 to 30volts. I made a new scale by removing the old scale from the meter and scanning it into a paint package on my PC. I deleted the old numbers but left the scale in tact. I then just added my new numbers on the....
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The Arduino displays the time and date on a LCD (optional) and in the Arduino IDE serial monitor window. A PCF8563 real time clock (RTC) IC is used to generate the time and date. The time and date can be set using the Arduino serial monitor window. An....
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Four (or more) inputs can be mixed and produce stereo output. Gain of each stage can be boosted by adding RX, but it should be kept below 50 (RX above 2 K) to avoid poor frequency, response. If more than four stages are used, decrease RXto 6 K for six....
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Consisting of two differential amplifier transistors voltage dividing type bias circuit, and this resistance is measured four bridge four of arm. Wherein the product is a plati..
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The new version has PCBs available, and is recommended for the best sound quality. If you need tone controls, you should see Project 97 which has excellent sound quality, and includes tone controls Much has been made of preamps, but provided a few simple....
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This is an example how to interface to the standard Hitachi-44780 LCD using an 8051 microcontroller and SDCC as C Compiler. I use a standard 16-character by 2-line LCD module, see schematic below. Here, I use 4-bit interfacing...
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Another one unit of graphic EQ. five bands. The basic difference with the other circuits is, that I use instead of IC, transistor and the power supply, go up in +/- 24V DC, ensuring low distortion and bigger margins of overloading. With switch S1, we can....
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Easy exchange of magnetic saturation voltage regulator circuit ..
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Here is a schematic diagram of electret microphone pre-amplifier using LMV721 op-amp. because the LMV721 has low noise and low power features, it would be an...
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Here is the single- 813 crystal oscillator transmitter, designed by RCA and exhibited in their advertisement on the back page of a "QST" magazine in 1938, and published by RCA in their HamTips bulletin, vol. 1, no. 4, dated December 1938. This transmitter`s....
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A talking compass is made up using a Hall-effect direction sensor (MODI) and an ISD1016 analog audio storage device. It is possible to program eight two-second announcements, for each of the eight main compass directions. The Talking Compass is comprised of....
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This circuit outputs the maximum (or the minimum) of the four input voltages Vv V2, V3, and V4. Each of these input voltages is in the range 0 to 5 V. The output of the unit is the maximum of Vv V2, V3, and V4 if the control voltage input is 5 V (i.e.,....
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When the input is disconnected, the transistor VTi conduction, VTz cutoff relay KA released. When the input is shorted. VTi deadline, VTz conduction, KA pull...
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This 555 timer clap switch circuit electronic project is designed using some common electronic parts. This 555 timer clap switch circuit electronic projec....
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High Quality, Discrete Components Design, Input and Tone Control Modules To complement the 60 Watt MosFet Audio Amplifier a High Quality Preamplifier desi....
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The modular multiplexers described in this application
note, take these, as well as other points, into consideration
and provide an optimal solution for the video design engineer.
The 16x1 circuits are realised using four Gennum GX434 or
GX214, 4x1....
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The following circuit shows about 12-volt Modular Burglar Alarm Sensor Circuit Diagram. Features: a timed Bell Cut-off., automatic Exit and Entry ....
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Here is a simple power resumption alarm circuit that can be fixed inside the switch box itself. It gives beeps when the power resumes after a power failure....
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This project and your efforts will provide you with a 0.55...3 watt input to easily 10 watt output. The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply.....
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This circuit is a Delayed Pulse Generator that is used to provide pulse rate and independent control of initial delay. The pulse generator of this circuit is...
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A dynamic microphone preamplifier can be realized using LM387 dual operational amplifier integrated circuit. Input impedance corresponds to 47k, it depends almost exclusively by R1. If you wish to connect a dynamic microphone with a different value, the....
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The circuit is so simple that there is little to say about it, but it gives very good results. Tr1 is operated in grounded base mode with input to its emitter to give low impedance input. The values shown give correct operation from 9v. If operating from....
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The output of the CA3179 is fed through the Dl!Q1 circuit. Those components serve to boost the 1-V output of the CA3179 to a standard TTL level. Then, depending on the position of range switch S2b, the signal is passed directly to the 7216, or through the....
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The two circuits di atas illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to 12 volts. The circuit on the left is a....
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The following circuit shows about Stepper motor controller. This circuit based on the PIC16F84A IC. Features: transistor is used to drive the ...
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The TRF1115 is the first of two ASICs used in the receiver section of Texas Instruments MMDS/MDS/WCS/802. 16x chipset. The TRF1115 down-converts the input frequency to an IF frequency in the range of 420 MHz to 480 MHz. The device provides a differential....
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The assembly code given here was written to see what it would take to make an AT90S1200 generate 8 channels of proper PWM. In this case, by proper, I mean with the maximum high frequency content consistent with the needed duty cycle and give clock. Take a....
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It would be convenient to use momentary contact push button switch to turn ON and turn OFF your Raspberry Pi (RPi). A press of button should apply power to micro USB header, and keep it ON while Raspberry Pi initializes and starts its application....
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The Schmitt trigger is a special circuit which acts like a switch that changes state at two different thresholds. These are called the upper and lower threshold or the positive and negative going threshold. The difference in these two threshold levels is....
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This circuit is intended to provide good square waves converting a sine wave picked-up from an existing generator. Its major feature consists in the fact that no power-source is needed: thus it can be simply connected between a sine wave generator and the....
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Many blind and deaf-blind people use portable electronic devices to assist their everyday lives but it is difficult for them to test the batteries used in that equipment. Talking voltmeters are available for the blind but there is no commercially available....
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Anyone able to help? The plan is an audio volume control using 40 relay-operated L-pad attenuators per stereo channel. Control is passed in succession to the relay a....
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A phase shift oscillator using the LM324 operates at an adjustable rate, 5-10 Hz, set by the speed pot. A portion of the oscillator output is taken from the depth pot and used to modulate the on resistance of two 1N914 diodes operating as voltage....
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This design circuit is shows an LM1893 power line modem circuit. This circuit is used to transfer information between remote locations by using the power mains. This circuit uses LM1893 that is used as a power line interface for half-duplex (bi-directional)....
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Crosstalk from digital data signals into the clock signal of a data-conversion system can cause hard-to-diagnose problems. This obscure problem is different than the crosstalk from digital data signals into the analog signal path, which was the subject of....
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This device is based on PICl6F628A one-chip computer, adopt one pair and receive and dispatch the independent ultrasonic transducer, utilize the Doppler effect, can detect in certain space whether someone enters effectively, and can output the switch of the....
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A transformer ratio-arm bridge circuit is used as shown in the simplified diagram of Figure1. The circuit consists of a standard reference capacitor (CS) and the insula- tion under test (CX). A special multiwinding transformer is the characteristic feature....
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Cats are predators of rats, the use of electronic devices to simulate mew Repeller is an effective method. Because it is an electronic device, mew big or small, can be fast or ..
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This power inverter circuit will provide a very stable Square Wave Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various off the shelf transformers can be used. Or Custom wind your own for best results.....
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Capacitive measuring instrument, b is the direct reading instrument measuring the capacitance of the circuit. The measuring instrument is capable of measuring a few picofarads ..
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A 9-V wall adapter supplies Vm. IC2 contains a low-battery detector circuit that senses l7IN by means of R6 and R7. The detector output Cpin 7) drives an inverter (Ql), which in turn drives the shut-down inputs Ic of 1C1 and SHDN of IC2. These inputs have....
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The LED power Meter is a simple RF detector using diodes to charge a capacitor. The voltage developed across the capacitor is indicated by a multimeter set to a low voltage range. The circuit is soldered together without the need for a PC board, as can be....
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One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable. This is achieved by connecting a potentiometer between common terminal of....
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I have a big mirror on the left wall, it makes the room brigther, but when watching a movie you want a dark room, and we could see reflections of the movie in it (very annoying) so i installed a grey/black blind i found in a DIY shop, it was a great fix. The....
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This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and....
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This PSU has been abnormally advised in place of current-hungry ham telephone system transceivers. It delivers vigilantly in relation to 20Amps on 13. 8V. For cut currents, a distant received attached output, able of 15ma up to a absolute of 20A has been....
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The use of a loop antenna of large size (12 18") provides a large signal pickup at AM broadcast frequencies. It has..
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This logic probe has four channels and uses two IF quad comparators to drive four bicolor LEDs. SI and SIB program the co..
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C1=100nF Multilayer or ceramic C2 : 4. 7 pF ceramic C3 : 100 nF ceramic (1 or 10 nF will do also) C4 : 40 pf trimmer C5 : 4. 7 pF ceramic C6 : 10 pF ceramic C7 : 22 pF ceramic C8 : 1 nF ceramic C9 : 1 nF ceramic C10: 100 nF ceramic C11: 100 nF ceramic C12:....
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The modem off indicator is intended especially for serious Internet surfers. It will be seen that the circuit of the indicator cannot be much simpler, or there might be nothing left. In spite of its simplicity, it may prove to be a cost-saving device, since....
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Construct a variable 5A, 2V to 25V Regulated Power Supply using LM338 Adjustable Regulator. Power supply schematic and parts list is provided here ....
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This is a simple triangle-wave generator using two IC devices and a transistor. The triangle wave is used as feedback to the square-wave generator. SI allows range switching in three ranges from 100 Hz to 100 kHz...
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An op-amp comparator is used to compare the converter output with a dc threshold voltage. The circuit flashes the LED when the input frequency exceeds 100 Hz. Increases in frequency raise the average current out of terminal 3 so that frequencies above 100 Hz....
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A lot of friends me asked to draw a more shrunk circuit 2-ch mixer, which will contain also, operation CROSSFADER. The circuits can be modified and added also other channels, repeating basic that I give. It can are added channels stereo PHONO/line or even....
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The left hand side transistor T1 is rigged as a voltage comparator using a resistive network. The resistor at the upper arm is the LDR and the lower arm resistor is the preset which is used to set the threshold values or levels. T2 is arranged as an....
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Decorative lights arranged in different moving patterns look very interesting and are surely eye catching and that`s why these types of lighting arrangement have gained immense popularity in today`s world. Though the more complex lighting might need the....
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An NEC602 is used as a mixer with a zero IF frequency output, U2 acts as an audio amplifier. This receiver is primarily for SSB and CW signals. Tl and T2 are 10.7-MHz IF coils used in AM/FM transistorized radios, etc...