Popular Circuits Page 91
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This FM transmitter circuit is very simple and it has a acceptable transmission . The signal transited from this FM transmitter circuit can be received at....
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The above circuit, whilst it works, is GREATLY INFERIOR to Lev`s Oscillator for Theremin use. The above simulation waveforms - Red Sine = voltage on L1:A, Black Sine = Voltage on Q1:D, Blue square wave is current through L1:B and Q1 (10mA, 5mA average) It....
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The circuit powers the load via the regulator"s input instead of its output. Because the regulator"s output sees constant dummy load R1, it tries to consume a constant amount of current, no matter what the voltage across the actual load really is. Hence,....
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Designing various electronic circuit system (synthesizer, modem, decoder, data converter, etc) of ten need a frequency modulator subsystem. An FM modulator is...
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Small Radio Transmitter. This article contains information about building a small radio transmitter, which has a PCB 1.75 x 2.5 (45mm x 68 mm) and has a range of about 30 yards or...
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Protect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mai....
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The tracer, consisting of both a transmitter and receiver, is designed to follow a closed-loop wire or cable system. It follows an induced voltage path created by feeding a low-current, audio-frequency signal through the cable. When the pick-up coils....
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A fluorescent lamp has quite a few unique requirements to get it to start up and stay illuminated. How does this flyback converter manage to do these things I had first looked around to see if I could find a schematic for this fluorescent lamp assembly, but....
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This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to watch your own program without....
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The design of the AC to DC front stage boost converter in discontinuous mode underwent a few steps. First, the specifications where defined. Then, research was done and the basis power factor correction circuit was analyzed. Finally, the boost converter....
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Common intermediate frequency amplifier circuit having a circuit and on the radio as shown in FIG. Component Parameters Reference values are as follows: 1) transistors: VT1 to ..
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This system is used to distribute IR commands around your house. This is useful if you have A/V equipment in one room that you want control from several other rooms. This project uses one Microchip PIC 16F877 to do all the work. The firmware is written in....
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The application circuit shown in the picture below with output voltage higher thanreferenced voltage is composed of the W723 multi-port adjustable positive stabilizer. There is current limiting protectionin this circuit and the output voltage is adjustable....
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This oscillator-driver produces a deafening sound of about 3 kHz, modulated with a 10-Hz warble. BZ1 is a Matsushita EFB-RP3..
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This unit would be mounted in a small plastic or preferably metal box, with a 9V battery, level control, a male XLR connector (same as on a mic) and a switch. Current drain is low, since the circuit only uses one dual opamp. There is no need for a high....
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A low power, low cost dc lamp dimmer for a two-wire portable "flashlight" can be realized with little or no heatsinking. In addition, a single potentiometer, R3 adjusts lamp brightness. Battery power is stored in Cl for Ul, which is a free-running....
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This scheme is for 4 cylinder motor. This will make your car spent less fuel, be a little bit faster and you wont have to frequently open your distributor cap to change the contact buttons thus wasting less money. T1/T2 create one monostable multivibrator in....
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The drop-down category menus above may help you find what you are looking for. Be sure to also look under the Bodo`s Power by Topic sub-categories. They include topics similar to our general categories. If the above suggestions were of no help, you can....
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This circuit allows you to set a limit on the maximum output current available from your PSU. It`s very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you....
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By the transistor VTa, VT4, sense resistor Ro-current protection circuit and other components. The power supply after overcurrent or short-circuit fault is eliminated, can not ..
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FIG, T is the excitation transformer, R, varistor, rectifier diodes to protect against VDii ~ VD16 breakdown; Rz, C2 resistive capacitor protection..
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Here we`ll discuss how to make an electronic spy bug circuit using two methods, one that consists of wire link from the transmitter to the receiver, and the other which is completely wireless and can be used to eavesdrop a particular conversation over a....
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This hack illustrates how a car can be controlled from anywhere in the world by tapping into the disgnostic systems and onboard webserver of the car. The objective is to keep the car live and connected to the Internet 24G—7 even when not being driven. It....
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ICs that in the past were far too expensive for the hobbyist tend to be more favourably priced these days. An example of this is the AD8099 from Analog Devices. This opamp is available for only a few pounds. The AD8099 is a very fast opamp (1600 V/ms) and....
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Modern acid batteries and lead plates, are embodiment of simplicity in use. Unlike NiCd batteries, they must be recharged by connecting to a constant volta....
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Have you ever wanted to make a line following robot but the infrared sensors were too expensive for you Do you want to upgrade the robot in my other instructable Also, if you`re from the UK and have a maplin store near you, you`ll be able to get some IR....
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If you want to omit this balance control, such as when using separate pots for the volume controls, see the balance control notes on the 7-tube output amplifier page. "Wes, I used the schematic posted on your site, and built this. modified slightly with....
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In the silicon-controlled trigger circuit, cadmium sulfide cell connects the relaxation oscillator before having a sensor to blink in darkroom. That make the speaker emit the warning sound of Ka, Li. The rate of the sound will increase with the quantity of....
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Use your Symbian OS mobiles to control devices through Bluetooth.
The serial to Bluetooth converter from sparkfun.com is used in this project.
The Microcontroller At89C2051 is used to receive the data from the mobile through bluetooth.
Most of the....
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The second is a Signal Distribution Board that relays voltage, ground, and other signals throughout the pick. We can use this board, and it is modeled on its page: Signal Distribution Board. The 7400 pick system has two stepper motors, both with two coils.....
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The pilot detector output is designed as an open collector output, therefore an external pull up resistor is needed. To force the decoder to "MONO" Pin 19 has to be clamped to a voltage below 0. 8V. ..
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On the face of it the design of a Sound Square is simple, all you need are several Infra red beams across an opening and when ever you place your hand in it you break one of the beams. Simply detect which beam is broken and you know where about the square....
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The LT®1932 is a fixed frequency step-up DC/DC converter designed to operate as a constant-current source. Because it directly regulates output current, the LT1932 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the....
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The clock pulses from the555 astable circuit is sent into the 4017 decade counter. Each output becomes high in turn as the clock pulses are received. Appropriate outputsare combined with diodes to supply the amber and green LEDs...
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As shown in FIG grounds INA155/156 constituting the input current protection circuit. INA155 input internally with electrostatic discharge (ESD) protection diodes when the inpu..
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Why have one resistor and transistor for each LED, instead of chaining the LEDs in series and controlling them with a single transistor which is controlled, in turn, by the arduino pin coming in through a single resistor I have no qualms about implementing....
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Uses CA3130 BiMOS op amp that operates at a frequency of 1 kHz. With rail-to-rail output swing, frequency is independent of supply voltage, device, and temperature. ..
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A common collector amplifier (1) common collector amplifying circuit structure and key components of common collector amplifier circuit as shown, the key components of the comp..
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It needs 2 volts as its threshold however, that only allows a small amount of curent to flow through the transistor. How do I know how much voltage I need to make it fully on. Also, how do I determine what type of resistor to use from the 5V GPIO pin to the....
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I finally got all of the materials I needed in to work on my arduino powered Diversity controller. The plan is to support 2 inputs (though the hardware can support up to 4 inputs), and 4 amplified outputs. The diversity will use RSSI to compare feeds and I....
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Simple CATV Upstream Fiber Optic Receiver Uses DC Pilot AGC. Upstream fiber links in a community antenna television (CATV) system are usually among the most difficult elements of the network to align properly. Set-top boxes and cable modems employ....
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The current draw should be somewhere between 80 and 100 mA. The exact value is very much dependent upon the Si570, the version (CMOS vs LVDS), the frequency setting, and component variations in the circuit. You can test the SW1 programming of U3 by checking....
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How do you make a 1950 Studebaker even cooler? By installing an iPod Nano in the dashboard, of course! The folks over at MAYA Design hacked their way to a touch-controlled sound system with this project they`ve dubbed the ""Nano-Baker"" (or ""Stude-iPod"")....
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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....
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I m planning to construct a frequency synthesizer circuit and i found this circuit diagram..but i m unable to figure out a component..can any1 explain 2me what is the part with the VDD from pin 9,Vss from pin 8 and pin 12 connected to the phase comparator 2..
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This is first version of laser diode power supply, and current source using n-channel power device. Component: LM358D IC, Transistor, Resistor, ....
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A typical liquid crystal display inverter circuit (OZ965) It shows a typical liquid crystal display of the inverter circuit, which is mainly controlled by the 02965 chip, the d..
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Ohh ok cool, I have forgotten about the -12 supply because my 555 Oscillator doesn?t use a -12 supply, it only uses a +12 and a Ground. You see on my....
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his circuit is built from standard components and can easily be adapted to be controlled by a computer. If you use cheap surplus transistors and stepper motor, the price of the circuit can be kept to under $10..
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Its a digial clock which make use of AT89C4051 to work as a Real time clock. Port 1 of the controller (AT89C4051) is used as the data lines for the LCD (starting from pin 7- pin14 of LCD). As you can see there is not much change in the hardware except the....
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A simple detector of radar signals uses the junctions of the input transistors of an LM1458 op amp as RF detectors. The lead..
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Synchronous vibration Ai, a liter zygomatic count number, control logic i NIE armpit three parts. Internal oscillator start-up Ai Road [U l: zero just after the sync pulse. Stop Ding Zhen sync pulse close to the lower..
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With IC SLB0586A from Siemens you can build a simple touch light dimmer circuit that will allow you to adjust the lamp intensity. Together with a TIC206D triac, it enables smooth regulation of light intensity from a bulb of 10W 400W. A coil of 100 µH/5A is....
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TPTG transmitter was transformed into a trendy TNT. You can use your present K-111 power pack for this transmitter as well as for the receiver, and thus save the expense of a separate power supply unit. Build this little transmitter and go "on the air. " The....
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The astable multivibrator is a unique form of the relaxation oscillator in which the in-phase feedback is provided by a separate transistor. The first multivibrator was built with vacuum tubes and the circuit was very popular from the start. Millions were....
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This circuit, a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then....
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The Button Code is a system that allows a single button to act as a keypad. The user enters a 4 digit code into the system using button taps. The button can be placed where the public can access it since like a keypad there are many combinations to keep....
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SA9618A CAN be used for ALPC and signal conversion between CD optical pickup and decoding chip. This IC incorporates an interconnection to general CD optical pickup Photodiode bias voltage VREF generation circuit, RF Amplifier and ALPC circuit. (This IC is....
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This circuit shows an ICM7217 and an ICM7555 that are connected as a basic frequency counter. The connections between the ICM7217 and a common-cathode LED display are shown in Fig. 12-18. The frequency counter is calibrated (against a known standard) using....
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This circuit is a motion detection sensor, this circuit uses a light source and detector as a sensor infrared motion detector. motion detection, detection sensor, sensor, infrared, LED, phototransistor, transmitter, receiver, NE555, astable multivibrator,....
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Using the LM2876 audio power amplifier circuit can be designed a very simple high efficiency power audio amplifier capable of delivering 40W of continuous average power to an 8 © load with 0. 1% THD+N from 20Hz 20kHz. The LM2876 audio power amplifier circuit....
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This circuit can generate a signal lkHz and three output level options. It can be used to test communication equipment maintenance and barriers, can be quickly and accurately..
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For a project I need to display a progress bar of the activity performed by my MCU. For this purpose I am going to use a bargraph display, but the problem is that bargraph display driver driver IC LM3914 uses analog input where as MCU produces a digital....
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you could apply a step sequence that only triggers every other step, then, make the steps that do trigger, rise with each activation. From there you could apply that LFO to other parameters of the plugin to spice up the sound. (I. e. you could apply it to....
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Metal enclosure, forget the plastic case they sell, it`s nearly useless. ( I made a box from copper PCB that I soldered together, it works okay, but could be better. ) Ground it to the enclosure well, and connect everything to a good earth ground. 4. Make....
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Building a headphone amplifier is like building a power amp - only the current demand is just a little bit lower (about a factor 100). Various designs can be found in the internet, and it is relatively easy to integrate the proposed crossfeed filter. I....
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As shown by the block diagrams in Figure 1, overall signal flow in this five-input mixer was minimally changed upon modification, but I added solid-state buffers that drive independent direct outputs for the five preamp channels. For each channel, the audio....
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Pictures and a sample schematic (including pinouts) of an AMP hexadecimal (16-position) switch with screw slot actuator....
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The disadvantage of the circuit above is that the supply of the op-amp is tied to the HV supply. Most op-amps are limited to around 30V on the supply, so the circuit wont work for higher output voltages. The circuit below avoids this this problem by....
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This circuit uses an 87C57 microcontroller and a few peripherals to condition X-10 power-line carrier-code formats from a personal computer to use an X-10 power-line interface in a home-control system. Software details are available in the reference....
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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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The 5AH will trigger when the voltage across the two 0 juF capacitors reaches the breakdown voltage of the lamp. Control can be obtained full off to 95% of the half wave RMS output voltage..
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This page provides soft power switch circuits for toggling electronic devices ON and OFF with a momentary button press that controls a latching high-side MOSFET power switch. Several micropower latching switch circuits are provided. Owing to their low....
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This high-performance switching controller for a low-power de servo motor uses a symmetrical complementary- transistor bridge. The bridge acts as a reversing switch between the motor and a single-ended power supply. Since the transistors operate either....
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Added a BASIC preprocessor made in python that allows you to write code withought line numbers and to use labels. the preprocessor adds the lines and changes the labels to line numbers. Also made an AmericanFootball BASIC game, as an example of how to use....
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This circuit connects in series with your home phone line and delivers the phone conversation through the FM band any time you pick up the telephone handset. Transmitted signal could be tuned by any FM receiver. The circuit features an "On Air" LED indicator....
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The circuit was designed to illustrate the use of tone control circuit by which the audio signals are adjusted before being carried out to any output devi....
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The inductive electronic doorbell circuit is composed of the inductive electronic switch and music generator circuit, and it is shown in Figure 3-115. Inductive electronic switch circuit is composed of the inductive electrode A, transistor Vl-V4 and the....
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This inverter can deliver high-voltage ac or dc, with a rectifier and filter, up to several hundred volts. The secondary and primary of T1-a 12. 6 to 440 V power transformer, respectively-are reversed; e. g. , the primary becomes the secondary and the....
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Some links and info on remotely using a DSLR, mainly arduino-based..
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Even thought the power was off there was AC at the handle plug and I shorted something. I pulled it apart and found a transistor blown apart. I figured it would be an easy fix. One month, twenty plus dollars in parts and many changes of components it is....
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This small circuit is a Linear amplifier for driving small UHF TV transmitters. Its gain is 7dB and can amplify a signal between 450-800 MHz. You can drive the circuit with 1 to 1,5 Watts signal. Better use double layer PCB with the second layer connected to....
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Some of the components for the EQ are mounted on the pots. The only additions I`ve made to the circuit from the last posted schematic is to add a feedback loop from the line output to the switched side of the first input jack, so that the connection is cut....
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ULTRA PURE 125KHz SINE WAVE SIGNAL SOURCE . For some RFID systems, which is at 125KHz, a very low distortion signal source is required. The circuit on this page results in a 10-volt peak-peak signal into...
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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The SN754410 Dual Motor Control circuit can be seen below. It is just about as simple as it looks with the PIC being the central processor. The main parts used and seen in the schematic below are the 7805, 18F452 and SN754410. The LM7805 +5v Regulator is....
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The ADAU1701 datasheet recommends on p18 that MP11 be used to derive MCLK. Now MP11 also serves the purpose of OUTPUT_BCLK when used for I2S. Therefore does this mean that I can connect MCLK and BCLK together 2. The ADAU1701 operates at 3V3 and AD1955 at 5V.....
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This view is not far from wrong because the operation of FM detectors is widely regarded as mysterious. The ratio detector to find out how it works, without....