New Circuits Page 32
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Well since I learn fastest by doing (not exactly unique I guess) time to start my next trick. Adapting one of the many curve tracer schematics, probably Metzger`s circuit from the early `70s with modifications to an ADC capture system and output to a 320*256....
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With the integrated audio TDA8571J designed for automotive applications, this circuit can expand the sound of the car radio or connect a portable MP3 playerin it. Internally, thechiphas eightoperationalamplifierseton the bridge, allowingeachspeaker....
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As friends many take an interest the circuit about IC 555 which be integrated highly popular that circuit. I then lead the circuit sets the time be Basic...
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The DSC Sine and DRC Random vibration controller cards have current sources on the two inputs available for powering integrated accelerometers without requiring external power supplies. These current sources have an 18 VDC open circuit voltage and output 4....
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This example shows a tunnel diode used to make an oscillator. The two resistors bias the diode in its negative resistance region. As the current begins to flow through the inductor, the voltage across the tunnel diode increases until it hits the negative....
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Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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Building a RFID access control circuit at home and seeing it actually work can be truly an amazing experience. Although the circuit is not a hi-tech one, but comparing its low cost with the fairly good results obtained simply proves its high degree of....
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Description: This circuit shows about 6-12 Chanel TV Transmitter-Coupling Circuit Diagram. Features: used to stabilize the 10 P to work in the 6-12 channel ....
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This is a simple design for Voltage Regulator Circuit using pass transistor. The design has built by LM317T. The LM317T output current can be increased by using an additional power transistor to share a portion of the total current. The amount of current....
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Add some resistors in parallel connection for more audio input. To adjust the volume for each input channel, add linear trimmer or potentiometer with configuration: pin1> ground; pin2>output; pin 3>input..
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A Bridgeless PFC converter based on a novel switching method eliminates full-bridge rectifiers and helps to reduce the size and cost of switching power supplies....
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Feedback in public address amplifier is something that should be avoided. The ideal solution is by adjusting the microphone and the speaker position, but it`s not always possible in many situation. Using frequency shifter to change the output frequency 10Hz....
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This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to....
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The astable multivibrator I found in wikipedia and also my college material are the same, which is on the left hand side of the picture. While for the schematic at the right hand side, I found it from the example of LTSpice. I would say because it`s drawn....
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The following circuits are presented in a logical order (unlike the way they were designed) from initial power-up to the frills tacked onto the end of the project. A less organized and more stream of consciousness version of the Mark II design can be found....
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Buffers belong in a subset of amplifiers, in general. In addition, power buffers can be thought of as belonging to a subset of power amplifiers, in specific. (Isn`t taxonomy fun ) The uniting features for all buffers are unity gain and a low impedance output....
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Simple triangle-wave generators have a weakness in that the waveform of their output signal normally cannot be modified. The circuit presented here makes....
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This is a schematic diagram of video amplifier circuit with bi-phase output. Bi-phase output provides both positive-going and negative-going signal, and can be used as balanced signaling. The main component of this circuit is LM1201 In this circuit, the....
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Programmable timer for appliance circuit is advanced timer appliance is controlled by timer circuit from 8 sec. to 2 hour.circuit diagram of programmable timer for appliance ...
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Here is an interesting hobby circuit of a crank door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC....
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A meter is a measuring instrument. An ammeter measures current, a voltmeter measures the potential difference (voltage) between two points, and an ohmmeter measures resistance. A multimeter combines these functions, and possibly some additional ones as well,....
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I had the prototype working on the breadboard, I built another unit on a piece of Radio Shack Protoboard for use in the field. It came together in only a couple of hours, and again, worked the first time (I must be living right lately). This more rugged....
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Speed regulation is accomplished by sensing the motor current with R17 and using it as positive feedback to compensate for motor resistance loss. The gain pot should be set to a point just below the point where the motor speed oscillates. After finding this....
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This automatic door opener can be made using readily available components. The electromagnetic relay at the output of this gadget can be used to control t....
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This section describes the various systems aboard Chinook II. Our approach is to use reliable and appropriate systems consistent with the size and for our intended use of the boat. Being a tinkerer and engineer (for better or worse) I often build parts or....
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This is transmitters circuit that can transmit both FM and AM signal simultaneously at two different frequencies FM in 100Mhz and Am in 20 MHz. Here is the ....
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Producing low-distortion sine waves, this oscillator operates over the range 16 to 22000 Hz....
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TDA7088 contains a frequency-locked-loop (FLL) system with an Intermediate Frequency (IF) of about 70 kHz. For supplying this circuit we can use an 3 volts battery cell or a regulated power supply. ..
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This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it is a modern substitute for the old sandglass. Useful also for....
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This is a circuit for high quality power supply with a continuously variable stabilized output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a....
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Well I finally got round to purchasing an Arduino Uno Open Source Prototyping Platform and first impressions are...
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A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful in many applications in which some sort of time-delay counting in seconds is desirable. The circuit is formed by a CMos 4024 counter/divider chip and 3....
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This is an Analogue TV Transmitter. Sound modulation is type FM with a 5. 5MHz carrier and video transmission is PAL. Frequency is adjustable via C5 and tunes 54 to 216Mhz with components shown. This is suitable for countries using TV systems B and G. Please....
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Using TEA5551T monolithic integrated radio circuit can be designed a AM radio receiver circuit which is designed for use as a portable radio receiver with headphones. The TEA5551T radio receiver circuit contains all is needed for a AM radio receiver circuit....
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All miniature electronic devices operate off batteries. Some of them need higher than the standard battery voltages to operate efficiently. If the battery of that specific voltage is unavailable, we are forced to connect additional cells in series to step up....
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Description:This circuit shows about 7555 IC For 5 To 30 Minute Timer Circuit Diagram. Features: useful circuit because by using this circuit you can operate ....
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This is a selection of small self-contained alarm circuits. They have a very low standby current; and are suitable for battery operation. Some are triggered by normally-open and normally-closed switches. Some react to changes in light or temperature. The....
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This PLL transmitter is controlled and the frequency is very stable and can be programmed digitally. Transmitter will work 88-108 MHz and output power up to 500mW. With a small change can set the frequency of 50-150 MHz. The output power is often set to....
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This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low - so battery life is excellent. And by shutting down in the presence of extraneous IR radiation - it copes with the problem of excessive output....
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A modified B/W TV flyback transformer is used in this circuit with a voltage multiplier to produce 9- to 14-kV negative voltage. This is connected to a discharge needle to produce negative ions. ..
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A popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenna, that receive and demodulate the DCF77 time signal broadcast from Mainf lingen in Germany. DCF77....
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This device is used to photograph moving objects by triggering a camera or flashgun when one or two light beams are interrupted. It was designed to capture insects in flight, but can also be used for projectiles and anything else that moves too fast or....
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As shown in the block diagram above, the 10 MHz signal is produced by an oven-stabilized 10 MHz crystal oscillator that is locked by a phase-locked-loop circuit (PLL) against the precision 10 kHz signal generated by the GPS receiver module. In addition to....
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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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This switching power supply circuit diagram is based on the MC33374 high power voltage switching regulator IC manufactured by Motorola Semiconductor. This MC33374 switching power supply circuit will provide a maximum output power around 90 W and require few....
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The Coupe to USB adaptor - AKA `microwidget` is an inline adaptor to allow a laptop user running Windows 2k or Windows XP (it is as yet untested with Vista but should work) to interrogate the ECU on the Fiat Coupe. With suitable software, the ECU can be....
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A Fence charger or energizer is an equipment which is used for charging(electrifying) a fence or a boundary in order to protect the inside premise from human or animal interventions. Since these boundaries are mostly of large fields and parks, are normally....
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Adjustable Regulated Power Supply 0-15V 1A. Adjustable Regulated Power Supply 0-15V 1A. The output voltage is stabilized and regulated in the range of 0V to 15 V, supplied with a maximum current of 1A. The schematic diagram come from circuit: Adjustable....
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741 Stereo PreAmplifier Circuit Diagram This preamp circuit provides better than 20dB gain in each channel. PARTS LIST R1 -....
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Many modern circuits tend to work from a single supply voltage of 3V. But often they need a virtual earth at half the supply voltage for efficient operation. The splitter shown in the diagram bisects the supply voltage with a high-resistance potential....
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The HV9911DB1v2 is an LED Driver capable of driving up to 20 one-watt LEDs in series from an input of 21 27V DC. The demoboard uses Supertex`s HV9911 in a boost topology. The converter has a very good initial regulation (+/-5%) and excellent line and load....
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The spider prop is fairly simple in terms of mechanical setup. Where it gets somewhat complicated is in the electronics setup. It is based around a stepper motor. By their very nature, stepper motors are non-trivial to control. By that, I mean that you can`t....
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The QAMI5516 is an integrated Demodulator decoder solution for digital cable receivers for compressed Video sound and data services. A QAM Demodulator performs IF to MPEG-2 block processing of QAM Carriers The demodulated stream is then processed by Video....
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The mixer circuit above has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. As with any mixer circuit, a....
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LVDT (linear voltage differential transformer) is widely used as linear position sensor. AD589 integrated circuit provides a complete solution for LVDT....
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This is class D audio amplifier circuit that is used to control PWM motor speed. This circuit has two advantages for battery-powered portable devices. First,....
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A micro power solar engine has been a goal since my introduction to BEAM Robotics. I believe that if there wasn`t one before, I there is one now. What I`m presenting to you looks very similar to one of the circuits found in Steven Bolt`s web pages. As you....
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An audio compressor serves to reduce (or compress) the dynamic range Figure 6 shows the schematic for a more comprehensive compressor circuit, that offers control over The circuit below is a Dynamic Mic Compressor circuit is simple but the results are quite....
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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....
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The IC is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound IF signal PLL demodulator for positive and negative modulation, including sound AM and FM processing. A special function is implemented for the demodulation of FM radio signals....
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Commercial FM demodulation is done at the IF frequency of 10. 7MHz. With a frequency deviation of ±75kHz, the deviation of the IF carrier is ±0. 7%. With this deviation, it is possible to convert the FM to AM or PM and AM using passive RLC circuits. The....
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In order to avoid any soldering mistakes, I asked students to place all there resistors in the board first, and once I checked them, they could solder away. Capacitors were next, then LEDs then everything else. The middle school class had more success with....
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The debate still goes on as to which are better, valves or transistors. We don`t intend to get involved in that argument here. But if you can`t make your mind up, you should try out this simple amplifier. This amplifier uses a valve as a pre-amplifier and a....
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Yesterday I no enhance the circuit in my blog. Today lead High Current power supply 10A and Can Adjustable Voltage or Variable Voltage Regulator 2V to 36V. By...
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Apply power to the frequency counter and set the coarse (top pot) and fine (bottom pot) adjustments to show zero frequency on the display. Turn the pots counter-clockwise to set to zero. Sometimes the counter will show all squares and no digits. Disconnect....
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The machine used a 12 digit display (8 LED anodes scanned by an Anode driver, and 12 `digits` scanned by a Cathode driver, the latter being used also to scan the keyboard`s 7 columns. The bus is also simplified : 4 lines : the clock`s 2 phases, the Sync line....
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I have a 4 position slide switch according to the position of the slide switch, I should turn on different colored LEDs and also vary the output frequency of 555 timer in astable mode and drive a piezo buzzer. Problem : I cant use the same switch to control....
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Adopted operation amplifier can obtain constant voltage source with high amplification factor and large load current, when the circuit parameter has great change, the output voltage still have high precision. The output current limit is undertaken by T3, T4....
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Telephone remote control for some of the ideas is the time, now can let you own a phone to do remote control, this is the procedure and circuit. Automatically executed complex functions. Facilitate the development of a telephone...
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Don`t forget to seal your wire splices with heat shrink. It adds tensile strength to wires, is flameretardant and protects them from fraying. Heat shrink tubing forms a protective, insulated, water-resistant covering over wiring splices, crimp terminals and....
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5 band graphic equalizer using a single IC/chip. The BA3812L is a five-point graphic equalizer that has all the required functions integrated. ","0",..
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With the aid of an (old) moving coil instrument it is very little effort to make a simple voltmeter that, at a glance, indicates the status of a telephone line. Because the input impedance of this circuit is very high, there is no problem in having it....
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This circuit detects spikes in voltage around 18v. It is used to detect when a battery becomes disconnected on a running motorcycle. When that happens, the regulator is unable to maintain a steady voltage so the voltage fluctuates wildly. Even though the....
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The medical ultrasonic atomizer circuit is composed of power supply circuit, on the low side of liquid level protection control circuit, ultrasonic oscillator and fan drive circuit, it is shown in the figure 9-112. The power supply circuit is made of power....
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Use the Maxim MAX292 switched-capacitor filter IC to round a square wave into a sine wave; the circuit`s frequency range is between 5.2282 Hz and 8928.6 Hz when the microcontroller is operating at a 16-MHz clock frequency..
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The amplifier can be used in a number of projects to buffer and amplify outputs from devices such as Direct Digital Synthesizer (DDS) chips. The board was initially produced to amplify the output of the 9833 DDS chip. The board was also intended for Amateur....
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This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local oscillator with 435MHz rigs. The oscillator circuit uses PLL synthesizer IC`s of Toshiba for PLL circuit. TC9122P is easy to use preset counter for determining....
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This is circuit that first introduced by Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits). Pin 1 (Ground) The ground (or common) pin is the most-negative supply potential of the....
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Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials take for example th....
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The Hex switches are connected to J2 as follows: pin 1=common of both switches (+5V) 2=LSB up to 5=MSB of first switch. Then 6=LSB of second switch up to 9 which is MSB. I modified the oscillator slightly to get my cheap Farnell crystal to start reliably....
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Timing interval is initiated by applying power, and is determined by RT-CT. At end of interval, unijunction transistor triggers silicon controlled rectifier, to apply essentially full supply voltage to load. Delay range is from 0. 4millisec to 1 minute. -....
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This universal power supply contains, beside the bridge rectifier, a voltage stabilizer (78xx) and a pnp power transistor. This combination allow a load cu....
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This timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch off automatically after some time, saving battery costs....
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I am trying to build a monostable multivibrator so that I can use the output of an IR circuit to trigger a relay for n seconds thru the one shot. I found a chip ....