Top Circuits Page 158
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The circuits and wiring diagrams below have been tested on several hi-fi stereo systems with no damage to the systems. However, I cannot be responsible for some hair-brained engineer who may have used a radical design that might be damaged by an unorthodox....
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The Digital-Analog-Converter fetches one of 15 parallelly pressed keyboard keys from the digital bus of the synthesizer and converts it into a control voltage (1V/Octave) and a GATE signal. The TUNE-COARSE and TUNE-FINE pots allow pitch adjustment of the....
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This PCB was inspired by Colin Fraser, who found some very useful extensions to the bass drum circuit of the Roland TR909. Trevor page`s 9090 - project was of course also very helpful for me ! As an addition to these modifications, I added a "compression"....
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The AD7781 is a complete low power front-end solution for bridge sensor products, including weigh scales, strain gages, and pressure sensors. It contains a precision low power 20-bit sigma-delta (?-?) ADC, an on-chip, low noise programmable gain amplifier....
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The SSM2306 is a fully integrated, high efficiency, Class-D stereo audio amplifier designed to maximize performance for portable applications. The application circuit requires minimum external components and operates from a single 2.5 V to 5.0 V supply. It....
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The ADV7390/ADV7391/ADV7392/ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V 10-bit video DACs provide support for composite (CVBS), S-Video (YC), or component (YPrPb/RGB) analog outputs in....
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Because of their speed, accuracy, effectiveness, and cost, infrared (IR) digital thermometers have replaced traditional mercury thermometers. Using a thermopile sensor, an ear digital thermometer measures the infrared heat of the eardrum, which reflects the....
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The AD592 is a two terminal monolithic integrated circuit temperature transducer that provides an output current proportional to absolute temperature. For a wide range of supply voltages the transducer acts as a high impedance temperature dependent current....
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The ADXL362 is an ultralow power, 3-axis MEMS accelerometer that consumes less than 2 ?A at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode. Unlike accelerometers that use power duty cycling to achieve low power consumption, the....
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The ADP1864 is a compact, inexpensive, constant-frequency current-mode step-down dc-to-dc controller. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±2% accuracy, for up to 5 A load currents, from input voltages....
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The AD8555 is a zero-drift, sensor signal amplifier with digitally programmable gain and output offset. Designed to easily and accurately convert variable pressure sensor and strain bridge outputs to a well-defined output voltage range, the AD8555 also....
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This is a test project built hastily on a solder less breadboard. It uses a LM75 to read the current temperature via I2C and displays the result....
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An article describing how I made a firework ignition system out of a few things I picked up at Walmart and Radio Shack....
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An article describing how I built a small solar panel from scratch....
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The reference chosen is an LM329 sub-surface (or buried) zener (ZD1). Whilst the circuit symbol is that of a zener, it`s actually an active device, which results in much lower dynamic impedance than a normal zener, of around 1ohm. It also has low noise....
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I`ve seen this circuit around before, but it kept cropping up while looking at other electronics videos on YouTube. It`s called a Joule Thief, and it was....
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Right! Now that I have finally solved the issue on the charging here is prototype 1 of the circuit. It uses 2 voltage dividers to give 2.0v to D- and 2.8v to....
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The theory of operation has already been covered either in the Simple Superhet or the All American Five. Building this radio is really not hard especially if you have been working along through the circuits in the order I have presented them. The variable....
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The common wiring method had one side of the line cord going to a pin on the rectifier tube and the other side going to one terminal of the on/off switch. The other terminal of the on/off switch went to chassis. Suppose you plugged it in so the chassis was....
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It`s a power amplifier configuration that was developed in the 1950s. It is called a circlotron because the original idea diagram was drawn as a circle. The best I can do with my graphics program is to show it as a bridge. It`s promise is very low....
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Adding negative feedback to an amplifier, especially a vacuum tube amp is not as easy as it may seem. What is there to it Just connect a resistor from the secondary of the output transformer back to the cathode of the pre phase inverter tube. Right Not so....
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You see that the feedback is DC coupled, not through a capacitor, from the plate of the second triode to the cathode of the first. An earlier design used AC coupled feedback. This version was unstable at low frequencies. Bode analysis showed that a 3....
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You may be wondering why I am using four tubes. The reason is to get 50 watts without pushing them right to their limit. My tube manual gives two setups for EL34s in ultra linear. Both require a 6 k ohm transformer. Both setups use exactly the same voltages....
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Vacuum tube electronic circuits operate from comparatively high DC voltages (150 to 600 volts). The Electric Utility supplies 120 volts AC. We have studied transformers and, therefore, we know that the 120 vAC line voltage could be stepped up to the....
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This stage may be driven by another resistance coupled amplifier stage in which case the resistor on the left labeled RC is RCf for the previous stage. The resistor on the right labeled RCf is the grid resistor of the next or following stage. The resistor....
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The very first form of radio communication was radio telegraphy, as opposed to wired telegraphy. The telegraph key turns the transmitter on when it is closed and off when open. The operator taps out the message in a long and short, dashes and dots, code and....
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The P-C70-A from Antique Electronics Supply works just as well and maybe a little better than the coils you can wind. Winding coils is an interesting experiment and you may want to do it just for the fun of it. If you would rather skip all the fun you can.....
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One of the most insidious problems in an audio system is one or more ground loops. They not only cause hum pickup, they can inject interference from electric drills, computer hardware and even AM radio stations. Eliminating them is often not a trivial....
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The familiar transistor power supply has one big mother of a filter capacitor on the rectifier output followed by an electronic regulator which regulates out all voltage variations including ripple. In vacuum tube days only the very tip top of the line test....
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After building my Z-match tuner, I wanted to design a circuit board for a Stockton type swr/pwr meter that I could reproduce easily and see how small I could make it. The result is in the above picture. It is a board that measures a scant 1" x 1. 5" and is....
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The voltage regulator circuit was constructed using the LM317T, 3 terminal regulator. A heatsink was utilized to cool down the LM317T. The output voltage can be set to anywhere in the range of 1. 5 volts to 30 volts. However, for our application we needed a....
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The goal was to make a compass sensor compatible with the RCX and have it only take one sensor input port to take a compass reading. We decided to use a Dinsmore analog compass part that has two outputs that need to be combined to determine the direction the....
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power amplifier An amplifier designed to deliver maximum power output to a load. Example: In an audio system, it is the ....
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autodyne n. A heterodyne radio device in which one tube serves simultaneously as oscillator and detector....
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automatic gain control. A control circuit that automatically changes the gain (amplification) of a receiver....
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An electrical circuit that ensures that when two or more generators are connected in parallel to a power system they share the load equally. In this arrangement, if the voltage of one generator is slightly higher than that of the other generator in parallel,....
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flip flop A bistable multivibrator. A circuit which has two output states and is switched from one to the other by means....
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multivibrator. A relaxation oscillator using two tubes, transistors, or other electron devic....
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oscillator. An electronic circuit that converts energy from a direct-current source to a periodically varying electric output....
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phase-shift oscillator. An oscillator in which a network having a phase shift o....
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radar n. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency....
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schematic diagram. A presentation of the element-by-element relationship of all parts of a system....
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servo mechanism. A feedback system that consists of a sensing element, amplifier, and servomotor, used in the automatic control....
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tuned-radio-frequency receiver. A radio receiver consisting of a number of amplifier stages that....
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voltage-controlled oscillator. An oscillator whose frequency of oscillation can be varied by changing an applied....
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Wien bridge oscillator. A phase-shift feedback oscillator that uses a Wien bridge as the....
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Running the Simple MT 8870 Decoder from your Cell Phone the devise can be operated from any type of DTMF tones like Land Lines, Mobiles, Computers, Radio Transmitters that send DTMF tones over the air waves, Ham Radio sets with DTMF built in to them it has a....
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How the circuit works is simple when you send a DTMF tone to the decoder the value of pin 15 goes high for a short time this makes an excellent trigger as it supplies a few volts to pin 2 of the 555 Timer this triggers the circuit and turned the relay on for....
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For the limit switches on a custom 3D printer I`m designing, I want to try out some contactless sensors. I have chosen to use hall effect sensors, which are sensitive to a magnetic field. There are three different types of these sensors available. First,....
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The screen that we watch TV on at home has build-in speakers, but, because it`s actually a computer display, hasn`t got an infrared receiver. This made it impossible to set the volume with the TV receiver remote. I recently bought some Stellaris LaunchPad....
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Trigger programming with its build-in pushbutton. The solution I came up with was to add a tiny USB keyboard circuit to the pen`s interface. One method to have the pushbutton trigger a programming command would have been to add a microchip to the pen`s....
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From all the existing tubes, for sure the most interesting ones are the indicator tubes. From the 1930 ²s when they were invented, they captivated the eyes with the greenish shimmering light, thus the Magic Eye term appeared. The magic eye tubes are just....
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The number 83 rectifier tube is a mercury vapor type rectifier that is designed to operate on a vertical plane with the base pins pointing towards the center of the planet. It is supposed to be transported and stored with the pins pointing toward the center....
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My coolant level alarm has been working for the last 6 years, the alarm started to go off fairly regularly, although every time I checked the expansion tank, there was no problem with the level of coolant. Even with a cold engine, and using a screwdriver to....
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The Ping) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (from 2 cm up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The....
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One problem I faced when starting to tinker with my Arduino was just how was I going to go about drawing circuit diagrams for my creations. There seemed to be a huge choice of packages out there that allow you to draw a schematic diagram, some free, some....
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After some new experiments on sound analysis, I used a different design for the microphone amplifying section, that I am happy to share with you (From the statistics of Arduinoos, I know that sound capture is a topic of major interest for many of you). The....
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One end of JTAG Cable is a DB25 header used for connecting the parallel port of computer and the other end is a 20 pin (or 14 pin) IDC header used for connecting the user`s circuit board. Fig. 1 and Fig. 2 form a complete JTAG Cable circuit diagram. The....
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The LED meter is simpler and smaller than it`s analogue counterpart, and is very common in audio equipment. This version is based on a National Semiconductor IC, and uses the logarithmic version. Each LED operates with a 3dB difference from the previous one,....
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This circuit can be used to check the operation of your servos, check for full travel, binding and "drag" or rubbing when the servos are installed in your model, or even be used as a control circuit in a robotics project. PARTS LIST: IC1 = LM555 Timer (or....
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An inductance meter could be a valuable test instrument for a hobbyist to own. However few people own them because of the high price tags found on such instruments. That`s about to change. The Inductance Meter Adapter described in this articleis a circuit....
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A camera trigger to capture transient phenomena. I had a Mamiya ZE 35mm camera and Mamiyalite ZE flash unit. Typical for bodies of its time, the only means of remotely triggering the camera was the cable release socket built into its shutter release button.....
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Army Radio Sales Co. specialises in military communications equipment for the ham radio operator or collector. Military Radios From Many Countries For Sale, We Buy and Swap Military Radios and Accessories....
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Using live or neutral wire in AC household wiring as receiving antenna. Of course, this is possible only with high voltage capacitor inserted between the receiver antenna terminal and live or neutral wire. AC wiring antenna solution was mentioned as some....
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This page covers several different regenerative receiver circuits that were used in the past, mostly from 1920s to 1940s. Connections are shown with electron tubes (vacuum tubes/valves), but FET transistors can be substituted with little or no changes. To....
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One is in good shape, made in 1979, and capable of producing sine, triangle and square waveforms. This one is retained and used as main function generator for testing purposes at my main office location. Other three were not working, or working sporadically.....
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As this controller has been designed primarily for controlling model trains, it is designed to deliver around 12-15 Volts, although this system should work with as low a voltage as 3V (indeed it also works on a 6V supply to control some accessories I have).....
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This year for Valentine`s Day I decided to get nerdy and make something electronic for Caroline. I first tried to make a animated LED heart with a joule thief and a single AA battery, but I couldn`t make a suitable air coil. So, I decided to modify this....
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Design a circuit with four single-bit inputs X, Y, T, and Z, but only one single-bit output E. A two bit control code word S0S1 selects which of the four inputs is propagated to the output (the selection code is not unique). Your answer should be in the form....
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Hi, Have installed a new wired doorbell. (DESA) Heath/Zenith Model #LE-65-B. (Electronic) I also changed and added a new 16 Volt Xfrmer and a lighted pushbutton and a diode. After install, all worked fine including the ""Lighted"" pushbutton. I checked the....
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The diagram (schematic) is the same like the SNES NTSC RGB cable from here (only put capacitors to the RGB "line") or is different Yes the diagram is correct, but without the capacitors. You can use a Gamecube SCART lead but you must remove the capacitors on....
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The photometric camera for the SDSS consists of two TDI scanning CCD arrays, one, using 30 Tektronix/SITe 2048 x 2048 CCDs in a 5 by 6 array for five-color photometry, and the other using 24 2048 x 400 chips for astrometry and focus monitoring. We here....
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The full-scale deflection of the universalhigh-input-resistance voltmetercircuit shown in the figuredepends on the function switch positionas follows: The term IFS in the aboveequations refers to meter`s fullscaledeflection current rating inamperes. It must....
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This circuit is built around a 555timer using very few components. Since the circuit is verysimple, even a novice can easily build itand use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this device.....
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When 12V DC from the car battery is applied to the gadget (as indicated byLED1) through switch S1, the circuit goesinto standby mode. LED insideoptocoupler IC1 is lit as its cathode terminalis grounded via the car audio (amplifier)body. As a result, the....
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This causes T1 to conduct, taking pin 2 of IC1 `low`. IC1 then enters a timing cycle, the duration of which is et by R1/C1, causing pin 3 of IC1 to go`high`. This causes T2 to conduct. At the end of the timing cycle T2 switches off, and the circuit waits for....