New Circuits Page 184
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Now day`s audio signal preamp is used in many electronic devices. There are many types of audio preamp circuits from simple to complicated big circuits. Here we are showing you a very good design of a small circuit of signal preamplifier. circuit is best for....
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Sometimes I can find a station and sometimes I can`t find any stations. Probably the main problem when tuning is, as soon as you move your hands or body, let go of the tuning cap or touch the 10k pot, whatever station you had on will either disappear or....
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This is a simple low impedance preamplifier circuit diagram. It used to amplify an audio signal. This circuit use a 12Vdc sources and very simple because work with less components...
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The resistance of my heater is made of 9$Omega$ 3mm diameter nichrome wire. On 240V(rms) voltage this makes 25A(rms) current. I have an access to a mains line capable of delivering 30A, so in theory I will be able to drive heater at full load. In reality I....
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Several years ago, National Semiconductor came up with some very high performance, easy to use audio power amplifier LM3886 circuits. I needed an extra amp so I can bi-amp some of my homemade electrostatic speakers so I tried the LM3886 chip. LM3886....
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One type of regulator of tone / tone controls are the Audio Graphic Equalizer. Audio Graphic Equalizer have 2 kinds in my opinion. Namely Audio Graphic Equalizer Bar and the type of parametric type is often called parametric equalizer. Audio Graphic....
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Power your three FSRs (or any other analog sensor) with 5V in parallel. Connect each sensor to analog pins 0-2, using a 10K resistor as a reference to groud on each input line. The sketch below reads three analog sensors. Each corresponds to a note value in....
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This circuit have an advantage over ordinary CONTINUITY testing Device, usually we are using multimeter to check the continuity of a circuit. It is not suitable to check the continuity of a circuit with high Impedence or resistance like Transformer,....
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This circuit is a real gem! Easy to make and more sensitive than many commercial devices available. It`s based around an LF351 low-noise operational amplifier and a 1mF choke acting as the sensor. Unlike most other simple EMF detectors, this one has a meter....
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Integrated AF power amps have seen great improvements in recent years offering improved power and easier use. The TDA1519C from Philips contains two power amplifiers providing 11 W per channel stereo or 22 W mono when the two channels are connected in a....
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Normally home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting. The circuit described here requires no physical contact for operating the appliance. You just need....
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By the dual sound multi-frequency encoding signal, the circuit modulates the emitted carrier frequency, and it composes a DTMF encoding wireless calling system circuit. The circuit uses DTMF encoding circuit UM97085 and decoding circuit YN9101 to form a....
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The figure below shows a schematic of a very interesting sensitive mic circuit which will boost faint sounds from distance. The circuit is quite sensitive and provides good gain to weak audio signals....
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The 25 watt power audio amplifier circuit powered using tube circuit. The tube TR will amplify the input about 20 watt, dual Trafo should be gain up to 40w watt. You can use wide voltage range 12v 20V to supply the power tube...
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This circuit is Wein Bridge Sine Wave Oscillator. The main problem in producing low distortion, constant amplitude sine wave to get the right loop gain amplifier. By using the 2N3069 JFET as variable resistor in the feedback loop voltage amplifier, this can....
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Is possible to syncronize the leds so that first, the speakers are still playing aloud, and two, the led are not always on during music playing. i pretty educated in electrical so i hope there is anyway at all to do this. Thanks. I`m having trouble following....
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This circuit can charge automatically, fast and rightly, batteries 6V and 12V. A basic factor in the success in the circuit operation is the use of transformer [T1] of good quality with very good insulation and resistance in the short circuits....
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CD-ROM 48X RF AMP Chip is RF pre signal processor and processes signals from optical pick-up. This chip processes main signal through summing amp, AGC block, EQ block, and generates SERVO error signals for SERVO control. It CAN playback CD-ROM and CD-RW....
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This circuit represents another version of an Armstrong Oscillator. This particular example uses a crystal in addition to the LC tank circuit used by the previous Series-Fed Armstrong Oscillator. By definition the Armstrong Oscillator uses a tickler coil for....
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In this project, 8 LEDs are connected to PORT B of a PIC microcontroller. Also a push-button switch is connected to bit 0 of PORT A using a pull-up resistor. When the switch is pressed the LEDs scroll to the right. The circuit diagram of the project is shown....
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This metal detectors described in the example can be used to detect metal objects with high permeable magnetic substances. The working principle. The metal detector circuit is composed of the power circuit, sine wave oscillator, PLL phase-locked loop circuit....
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Normally the base of a cordless phone has an adaptor and the handset has Ni-Cd cells for its operation. The base unit becomes in-operative in case of power failure. Under such conditions, it is better to provide a backup using Ni-Cd cells externally. Here is....
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A very simple low power AM FM radio receiver electronic projects can be designed using the TA8122 integrated AM FM receiver, manufactured by Toshiba Semiconductor. This radio receiver circuit can be used for portable radio applications or other similar....
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The above circuit is a fluid level meter that converts the level in the container on the left into a single-digit number, from 0-9 on a seven-segment display. In this case, 0 (zero) represents the lowest level, and 9 (nine) is the highest level. When in the....
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The doorbell sound circuit was two-tone sound. With the switch S1. working of the circuit, IC1 is a frequency division circuit, and a sound frequency generator came out. by C1, R1 is the frequency generator. This audio signal from pin 7 and pin 4 to pin 1....
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Telephones are reaching its death point all over the world. however there is more than 350 million mobile phone users in india, but there are tremendous number of telephone users are there also. Well, this telephone timer is designed to help saving by....
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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....
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This design will interest technicians who work on pneumatically operated valves and other 4-20mA current loop controlled devices. Although 4-20mA signal i....
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This Magnitude Comparator can be used perform comparisons of two 8-bit binary or BCD words. The output provides both a P equals Q function or P greater than Q function. A Magnitude Comparator would be considered standard logic or glue logic when a discrete....
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The following circuit shows a Single Chip FM Radio Circuit. This circuit based on the IC TDA 7000 or 7400. Features: low cost FM radio circuit ....
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The circuit is not only used for the latch output, but also for non - latched output, SB is control switch. When SB and VDD are turned on, it is in the latch output state, then the sixteen output ends are out control of Io output state; when SB and Io output....
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As they did with the monotron synthesizer, Korg has quietly released schematics for its the analog drum synthesis portion of its monotribe synth and step-sequencing rhythm machine. You just see the bits that make the drum sounds, but that`s the interesting....
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As the number of stations increased and the power levels also increased; receiver performance had to improve. The pentagrid converter, such as the 6BE6 tube (British EK90 valve), was introduced which was optimized for mixer performance. This included the....
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A robber will not stay anywhere with an ear-piercing sound as he cannot hear if someone is approaching. It`s the best deterrent you can get. The "F" contact on the piezo is "feedback" and is not needed in this circuit...
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This super simple design of aninvertercircuit does not limit it in any way from providing a high output power and an efficiency of a good 75%. Learn how to build aninverterthat will satisfy most of your power requirement at quite an affordable cost. The....
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When adding an alternating current signal to the capacitor, the wave position (the phase) of the charging current of the capacitor and the voltage of the capacitor shifts by 90 degrees. When adding an alternating current signal to the coil, it changes....
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The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR..
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Volt meter and ampere meter with PIC can be used to measure voltage and current at the same time. The series of volt meter and ampere meter with PIC uses a PIC16F876A as a data processor voltage and current are measured. This circuit uses a LCD viewer 16 G—....
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This is a figure for a block diagram of a modern automated systems incorporate closed-loop feedback for motion control. They typically include a servo system that consist of feedback elements and motor driver combined in a manner. This will give accurate and....
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The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential....
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We will describe the function of a digital stopwatch, 0 G 99 sec. The function of the stopwatch, relies in the use of 4 integrated circuits, which in this case belong to National Semiconductor ( It is obvious that other integrated circuits can be used to....
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Tube Tester and Filament Burn In Jig - Here`s my answer to cooking the tubes for days and then testing them before inserting them in an amp. Note - I have learned an important lesson with this jig. The filament alone heats the entire bottom of this tube and....
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Posts from PCB Schematic Design with DxDesigner tagged DxDesigner...
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2 x 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It has good input sensitivity, low distortion, good operating stability and full protection against overloads and output short-circuits. It can be used as a booster amplifier for existing....
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The BU8872 and BU8872FS are DTMF receiver ICs developed for use in telephone answering machines, and convert 16 different types of DTMF signals into 4-bit binary serial data. In addition to a compact 8-pin DIP BU8872 or 16-pin SSOP BU8872FS package, these....
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Hi everyone, A bit of background first, I know only the basics of electronics (ie: I know what components do and how to read schematics), but have no....
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The function of sound level displayer circuit to improve the out look of your amplifier circuit or your Radio player. Actually this gives an unbelievable ....
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This luggage or bike alarm can be used while travelling by trains or bus and we generally lock our luggage using a chain-and-lock arrangement. But, still w....
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Did you take that shorting wire off the resistor What about your pot, did you leave it cranked on full power What kind of increase do you think turning the pot gave you Good I suppose. I haven`t yet disconnected the shorting wire, but at the same time I....
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This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works on FM radio waves. Car alarms can be used on vehicles that have a 6-12VDC power supply. You can use....
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There are so many circuits available for infrared Burglar alarm but transmitter section of these burglar alarm circuits are complicated and you may have assemble it yourself. But here is burglar alarm circuit that uses the ordinary DVD remote as the....
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This disco lamp circuit is not a voice operated switch (VOX) because this circuit is too dumb to differentiate between musical sound or human voice. This is rather a sound activated than voice activated. One interesting application is to control your disco....
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A crowbar circuit is a power supply protection circuit that rapidly short-circuits ("crowbars") the supply line if the voltage and/or current exceeds defined....
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Gadget Master brings you the latest news on capacitance-circuits in our round-up of capacitance-circuits projects and websites for electronics designers, scientists and engineers ..
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Completely self-supporting garden lamps using solar cells as their energy source are gradually becoming more and more common. How do they actually work We took one apart to ¬nd out. From environmental and technical considerations, buying such a solar-cell....
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The following project can either stand alone as a plug-in peripheral, or be integrated as part of the TRS-80 keyboard unit. In either case, the specifications are: The hardware involved in this project, including power supply and miscellaneous hardware, will....
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Build based operational amplifier NE5532 and a couple of power transistor TIP41A / TIP42A, this audio amplifier circuit has capability to deliver up to 10W audio power output into 8 ohm speaker. This circuit is related to the 18 Watt Audio Amplifier, and was....
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Improve the power factor PF Use a energy-conserving important factor of electrical equipment. With the development of electric electron technology, high-frequency active power factor correction PFC Technology has already been more and more applied to various....
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The voltmeter shown in the schematic diagram below has very high impedance. The range selector uses conventional voltage divider resistors, but since the following pre amplifier uses JFET, the divider can be designed using very high resistance series....
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One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such as thermocouples. This circuit eliminates the need for a special sensor because it senses the....
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Pulse width modulation or familiarly known as PWM is used to control the delivered power to load without loosing the efficiency. The speed of an electric motor....
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Now gently bend the leads of the LEDs and using the schematic circuit diagram given below begin to solder Once you finish soldering, it shoul....
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The mentioned shunt-feedback configuration also allows the easy addition of frequency dependent networks in order to obtain an useful, unobtrusive, switchable Tilt control (optional). When SW1 is set in the first position a gentle, shelving bass lift and....
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The following circuit shows about Battery Powered Burglar Alarm Sensor Circuit. Features: foil tape and PIRs, such as magnetic-reed contacts, ....
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This circuit is design circuit for a differential analog circuit switches. The FM1208 monolithic dual differential multiplexer used in applications where the RDS (ON) must be the same match. Since RDS (ON) for monolithic dual tracks at better than 1% of the....
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Using a single-coil latching relay, which latches/resets with opposite polarities. I`ve tested the circuit with dual opposite-biased LEDs too, no light flicker in either direction to indicate a charge/discharge. QuadrupleA Apr 14 `13 at 23:14 Unless there`s....
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A very high power and efficiency 100w power amplifier electronic project can be designed using the STK404 audio power amplifier hybrid ICs that consist of optimally-designed discrete component power amplifier circuits that have been miniaturized using....
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The induction coil forms part of the anti-sidetone circuit. It couples audio to the receiver, and also reduces the volume of the callers own voice in the earpiece, which would otherwise be loud compared to the incoming audio from the distant end. The....
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Mono preamp based on a NE5534 circuit diagram. This preamp is particularly suitable for microphones with an output impedance of 200 ohms to 600 ohms. The advantage of the preamplifier is 50 dB, and bandwidth (-3 dB) extends to about 25 KHz. The splitted....
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The induction receiver shown below is very sensitive and can serve a variety of purposes. It is excellent for tracing wiring behind walls, receiving audio from an induction transmitter, hearing lightning and other electric discharges, and monitoring a....
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Actually this is the another version of my older DVM project that was based on PIC12F683. The older version displays the measured voltage on a LCD that is driven serially by PIC12F683 using 3 I/O pins. The new one uses PIC16F688 microcontroller that doesn`t....
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Depending on local regulations and the telephone company you happen to be connected to, the voltage on a free telephone line can be anything between 42 and 60 volts. As it happens, that`s sufficient to make a diac conduct and act like a kind of zener diode....
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50-300mW FM Transmitter With TX300 Electronic Circuit Schematic Wiring Diagram...
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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....
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Ambient light is increasingly being used as a source of energy. To help designers of such systems, this circuit accurately measures ambient light intensity over four decades of measurement. The design is highly cost effective and, with the sensor mounted in....
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For a couple of recent projects we have been asked to provide interesting and informative display units. We decided to build a unit which can be used in a number of different applications. It was designed to look good, be able to show graphics and text, have....
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This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. The frequency can be controlled using current. If we disconnect the 20k RIN from REF (pin 1) and connect it to a DAC, then we....
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Metal detectors are usually very complicated and it may be consist of very costly components and metal detector DIY circuits are rare. However this metal detector hobby circuit can be constructed by only a few components such as BC548 and an ordinary AM....
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This circuit is a circuit diagram 12V inverter is very easy to build, cheap components that many electronics hobbyists may even already have. Though it is possible to build a more powerful circuit, the complexity caused by the very heavy currents to be....
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We introduce an inverter today mainly by the MOS field effect tube, the ordinary power transformer forms. Its output power depends on the power of MOS field effect tube and power transformer, avoid the convoluted voltage transformer to wind, suit electronic....
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A robot can be defined as an electro-mechanical system with the capability of sensing its environment, manipulating it and acting according to the preprogrammed sequence. It is a machine that....
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Hi everyone. I have a quick question. I`m trying to devise a circuit that works off my car locks. Basically they get a negative pulse, which starts a latched relay, which will power up the ACC line going to the startup/shutdown controller. I`ve included a....
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The following circuit shows about Automatic Loudness Control Circuit Schematic. This circuit based on the TL072 IC. Features: different ....
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PTB78560BAS is a sub package of PTB78560B, If you need see the description, please click PTB78560B. If you need PTB78560BAS`s datasheet, please download it from below. By Texas Instruments ..