Popular Circuits Page 9
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The present tester is intended primarily for testing the 24 V electrical circuits found on most pleasure craft. However, if the resistors are given different values, the circuit may, of course, be used for other voltage ranges. For 12 V, the value of the....
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The oscillator based on IC2 is responsible for producing the sound. Its output is connected to the base of TRl, ..
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As shown below, the following figure is the use of a relay or the like of the starting circuit. Power input access resistance R, R role there are two, one: to prevent boot when..
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Pinout Of The Fa-6 - posted in General Discussion: Hello I am new at this Forum and hope that I will do nothing wrong. My question is how to connect aTape Recorder with ""line in"", ""line out"" and ""remote"" to my new FA-6. On the FA-6 is a 8 Din plug but....
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The technology of range finding employs extensively in civil, industrial fields such as measuring, medical flaw detection, car anticollision of position of the material, etc. , because the ultrasonic speed wants to the velocity of light it is much smaller,....
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The LTC ®4241 is a Hot Swap controller that allows a board to be safely inserted and removed from a live PCI-bus slot. It has a primary controller that controls the four PCI supplies and an independent auxiliary controller to controlthe 3. 3V auxiliary....
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This little aid was originally designed to test the Shutter Time Meter. This meter was specifically designed for analogue` SLR cameras. In order to measure the exposure time of a camera accurately, it will first have to be checked with a well-defined signal....
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Third series of the function with the same system, namely BTL (Bridge Transformer Less). By using such configuration we get several advantages, namely no use coupling capacitors or coupling transformers...
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Amplifier ic 18W using HA13118 IC amplifier 18 watt circuit is an IC number HA13118 Hitachi Hard. That the IC will be integrated amplifiers, class AB. And....
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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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12 Volts Lead Acid Battery Charger Circuit Except for use as a normal Batter Charger, this circuit is perfect to ‘constant-charge a 12-Volt Lea....
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Using a 4060 CMOS binary divider and built-in clock oscillator, a long-duration timer can be made veiy simply. The solid-state relay can be sized for your application, and can be replaced with a mechanical relay if a suitable power supply is available. With....
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Thanks to Don Klipstein ( don@misty. com ) for his comments and additions to this document. His Web site ( ) is a valuable resource for information relating to lighting technology in general and also includes additional articles dealing with fluorescent and....
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Some Garmin GPS receivers are capable of running off external power ranging up to +32VDC or more, whereas others can only accept a maximum of +8VDC...
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The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be....
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A simple audio watt meter circuit or an audio power or audio level meter circuit with diagram and schematics to measure amplifier audio output power in watts....
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This circuit shows about LM741 Ham Radio Circuit Diagram. Features: including AM, FM, 7 MHz SSB Transceiver, FSM, Dummy load, DSB transmitters, ....
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Post related to Do it yourself about become a VU meter and homemade rhythm lights easy....
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220V bulb where one end of the relay is connected to the 220V dc and the other end to ground; and is switched one to the other using the output of a PWM as shown in the block diagram below: However, I am afraid that this is a poor design and not safe: no....
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All you really need is a decent opamp, three resistors, three caps. Make one of the resistors adjustable, otherwise all components same value. It`s called a phase shifted oscillator and it has very good, very low distortion. The gain of the amplifier is set....
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Most portable systems have built-in PCMCIA sockets as
the sole means of expansion. The requirements of the
PCMCIA specification have led to some confusion among
system designers. This Design Note will attempt to lessen
the confusion and highlight other....
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Below you can see the rest of the schematic integrated with the voltage regulator from my last post. As I explained previously, the PIC16F690 is the brains of my system. This PIC is a mid-range option for hobbyists and has much more functionality than I made....
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The LM35 temperature sensor provides an output of 10 mV/ƒ for every degree Celsius over 0ƒ. At 20ƒ the output voltage is 20 x 10 = 200 mV. The circuit consurnes 60 A. The load resistance should not be less than 5 k ©. A 4- to 20-V supply can be used. (View)....
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This section contains intruder alarms for your home, car and motorcycle, power failure and water level alarms and even a snore detector. All circuits are listed alphabetically on the Circuit Index page and in date order on the update page. All contributors....
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As shown by ISO122/124 -type filter circuit shown in FIG. ISO122/124 modem internal oscillator frequency is set to 500kHz, in order to suppress from the DC/DC converter is any ..
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The following circuit is a Basic 555 squarewave oscillator. Feature : 1 Khz tone, Simple circuitry, limit = 200 mA, inductive voltage reduced, 4.5-9 Supply voltage. Component : 555 timer IC, resistor, capacitor, Speaker, 2N3053 transistor, push button...
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This 18 dB gain amplifier was built Manhattan-style to evaluate the Linear Technology LT1253 dual video amplifier as a candidate output amplifier for DDS systems employing the Analog Devices AD9850 and similar devices. This dual amplifier was chosen to take....
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Control a fan using an LM34 temp sensor and a computer fan with model number : ASB0912L. I used a 2N7000 mosfet transistor as a switch. I want my fan to run at 35% duty cyle when the temperature is above 77 fahrenheit and to run at 0% duty cycle when....
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The portable charger is intended primarily to give model enthusiasts the opportunity of charging their Nicad batteri..
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The simple and inexpensive circuit in Figure 1 monitors the liquid level in a container. The piezo crystal, carefully mounted at the bottom surface of the container, receives it activation from the 74HCT14 hex Schmitt trigger. The crystal generates stable....
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The Universal Serial Bus (USB) has become a ubiquitous technology for computer peripherals. It is available on virtually every new computer and in most cases provides a seamless connection method for a variety of consumer electronics devices such as digital....
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This circuit was inspired by a friend who wanted a reberb
for his portable guitar amplifier. I originally tried using NE5532
low noise op-amps for the buffer stages but they were too noisy
for the low level circuits so I switched to discrete 2N3904....
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Electronic Miss Manners infrared receiver and voice circuits ..
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These are resonant circuit or tank circuit oscillators. They are commonly use to produced high frequencies as ranging from I MHz to 500 MHz Hence they are also known as RF oscillators. These oscillators are used in RF generators, radio transmitters and....
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For those who are still with me, the preamp featured has optional tone and balance controls which may be omitted if desired (although I do not recommend this generally). The input switching may be extended if needed to accommodate more signal sources,....
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Figure 1-97 is a ten-band equalizer circuit with a first connection thereof. FIG lC is the utility voltage amplifier, R7, respectively, equivalent to the island in Fig 1-92 Rl,..
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I bricked my iPod shuffle, seems that the controller chip for the mini jack got wasted as it could no longer detect charger, PC connection or play music as it could not detect headphones. The arc have to be very short in order to limit the distortions of an....
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This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched....
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This GPS receiver is powered by 2 AA batteries. They are only strong enough for the GPS to stay on for about two hours, and this seems like quite a waste. I would like to be able to use a larger battery, and sometimes even an AC adapter...
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Crowbar circuits are so-called because their operation is the equivalent of dropping a crowbar (large steel digging implement) across the terminals. It is only ever used as a last resort, and can only be used where the attached circuit is properly fused or....
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Most of the V/F converters in this chapter produce pulse or square-wave outputs. Many applications (such as audio, filter, or automatic-equipment testing) require a sine-wave output, such as is produced by this circuit. The sine waves from this circuit span....
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A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The op-amp used can be any low noise, high performance type, e. g. NE5534, TL071, OPA 371 etc Nothing too special here. The schematic is shown....
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This design idea explains how to develop a water sensor circuit that can monitor upper and lower water levels..
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Figure 36 is the circuit of a preamplifier with high impedance input and an output circuit allowing coupling to a main amplifier. It will be found extremely useful for purposes such as boosting the signal from a crystal microphone. The input socket,....
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Triple check your pins on the datasheets for your chips and make changes if you need to. In my case, The RAM chip I used had a non-inverted enable on pin26, but the schematic assumed the enable was inverted. This caused the circuit not to work until I....
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This is my second-generation guitar reverb circuit. The fidelity is much improved over the earlier design, it is suitable for use as a front-end to a guitar amplifier. This circuit features clipping indicators on the preamp and reverb recovery stages,....
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ATMega168 or 328microcontroller chip w/Arduino bootloader (you can use the one on your Arduino for now!) $4. 00-$5. 50 - buy unbootloaded mouser (cheaper) / buy bootloaded sparkfun (expensive) I have created a Mouser project that includes everything you will....
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The Electronic Cash Register (ECR) keeps track of sales transactions quickly and effectively. An abundance of PLUs (Price Look Ups) and department keys accommodate a variety of merchandise items. This means a faster, more accurate check out process and the....
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This circuit could be used as a treble control circuit with high frequency gain occuring when R3 is set so a=b (we`ll call this k=0), and high frequency attenuation occuring when R3 is 22kOhms across a and b (k=1). So therefore, depending on R3`s setting,....
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The following circuit shows about Battery Replacement Power Supply Circuit Diagram. This circuit Based On The LM317 IC. . Features: to replace ....
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Circuit shown in Figure 3-127. It uses the time relay KT instead of the speed relay. Plugging time determined by the KT set. Generally 1-2s (adjustable). The circuit is suitabl..
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If you want to create the 100 watt OCL audio amplifier circuit. I want you to consider this circuit as one. It uses STK4231 IC products to create a simple, small and best economical. The STK4231 is Hybrid IC of Sanyo, in the family of STK4201II. Can provide....
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The clap sensor is a simple circuit that incorporates a PC microphone, a microcontroller, and an output. The following diagram shows the logical circuit design: I chose the ATtiny84 microcontroller for this project because I`m familiar with the....
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Basically 8051 controller is Mask‚ programmable‚ means it will‚ programmed‚ at the time of manufacturing and will not‚ programmed‚ again, there is a derivative of 8051 microcontroller, 89c51‚ micro controller‚ which is‚ re-programmable. This device also have....
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As the circuit operates, the three sets of diodes with their isolation capacitors, build up an increasing voltage on capacitor ?C1?. The voltage at point ?B? will also increase and be about twelve volts less than the voltage on capacitor ?C1?. Eventually,....
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For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched of to avoid irritating....
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The IEEE-1284 bus defines a parallel printer bus specification with speeds above 1MBps. IEEE-1284 defines a Point-To-Point asynchronous bi-directional interface. Devices may be either 1284 compatible {the older parallel port devices} or 1284 compliant. The....
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The circuit furnishes an initial charging voltage of 2.5 V per cell at 25°C to rapidly charge a batt..
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Here is a simple method of series connection into the telephone set suitable for PABX or short line applications. When the telephone handset is lifted, Cl is charged via D1 to (Vz1 -0.7) V and DF320 power on reset occurs. When the first keyed digit is....
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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As one of the thyristor type delay circuit The so-called cut-off delay, that is, after a period of delay after the closure of the thyristor. The delay time of the circuit withi..
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Hey another cool thing I found is that if you earth both the earth of the circuit to ground and the other end of the antenna to a separate ground, you increase the power dramaticaly, compared to using a normal antenna and coil. I made a similar coil to the....
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This application note describes a low cost, high performance UHF short-range Radio ASK receiver design using the Microchip Technology rfRXD0420. The reference design is suitable for: Wireless remote command and control Remote Keyless Entry (RKE) Security....
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This audio noise filter circuit is a bandpass filter for audio frequency band. It filters unwanted signals that are lower or higher than the audio frequenc....
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Open Loop Speed Control of a DC Motor via 8255 Digital I/O Controller chip using TCP/IP Server-Client Application Programmed in Visual Basic. The 8bit DAC0832 chip is used as the Digital to Analog Converter. In this project open loop control of a DC motor....
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This transmitter of 255W is depended on the coils we put at it to work in both the middle and the short waves. The power in the antenna is 255W and includes 4 states. The first consists of the EF80 that works as a COLLPITS CLAPP oscillator. Frequency....
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This circuit when used with a 555 timer will cause light emitting diodes to turn on and off more slowly. This will make the LEDs appear similar to incandescent lamps...
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The MT-2 Metal Zone ™ is one the most popular guitar pedals, providing over-the-top, insane distortion tones with huge mids and lows and an ultra-saturated sound. It has a unique dual-gain circuitry, providing long sustain and heavy mids and lows like a....
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This amplifier was designed to be self-contained in a small loudspeaker box. It can be feed by Walkman, Mini-Disc, iPod and CD players, computers and similar devices fitted with line or headphone output. Of course, in most cases you will have to make two....
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As shown in Figure, the circuit usestwo time relays KT1, KT2 to connect with thecontactsofelectric contact pressure gauge SP in series. When liquid or gas pressure has not yet reached, it can overcome thetrembling or spark phenomenons because of the SP`s....
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LM358 consist of two independent, high gain operational amplifier in one package. Important feature of this IC is we do not require independent power supply for working of each comparator for wide range of power supply. LM358 can be used as transducer....
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The RF stage of the receiver is based on a transistor VT1, this stage works as a mixer and a local oscillator and it works as a synchronous detector. A cable of the headphones works as an antenna. A signal received with this antenna is fed to the input....
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Circuit shown in Figure 3-92. It uses dual-phase sequence protection relay sense. When the power positive phase sequence (U, V, w), following the electrical KA pull. If the pow..
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This circuit should be the easiest to tune as well (Reason: when the pulse is at 6V, all transistors should be open switch, so logically, there will never be battery shorts). The pulse voltage source V5 can be replaced by a 555 astable circuit. V6 can be....
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This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car s LED light show. The Q1 amplify the audio from mic. The R1 is used....
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The LTC3531/LTC3531-3. 3/LTC3531-3 are synchronous buck-boost DC/DC converters that operate from input voltages above, below or equal to the output voltage. The topology incorporated in the ICs provides a continuous transfer through all operating modes,....
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Using a switch to power up your microcontroller projects may not be a good idea if you need to "wake" the PIC during some events. For example: A metal detector sends a pulse indicating a car is ready to enter into a garaje, so the user needs to type a....
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A relay is an isolated switch, there is no connection between the switching device and the connection. Relay is often used when controlling high voltage devices so that the intricate low voltage devices will not be damaged. There are many types of relays but....
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The schematic is very similar to the one seen in the CPLD Development Board Tutorial because it`s basically the same board with a tiny addition. The new part of the schematic is in the lower right corner. 8 (DIP) Switches, a resistor array & some additional....
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Monolithic/Hybrid Digital to Analog Converters using MC 1408IC,SE/NE 5018, Specifications and Applications...
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The most outrageous option would be to provide power via a battery pack. A more likely source would be the car`s battery. However, since the circuit`s goal is to sound the buzzer when the headlights are on, we might as well take the power from the....
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The compact high performance 4 x 4 crosspoint shown in Figure 1 uses four LT1205s to route any input to any or all outputs. The complete crosspoint uses only six SO packages, and less than six square inches of PC board space. The LT1254 quad current feedback....
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Colour in teaching, in order to allow students to understand the principle of color TV color synthesis. This circuit can be beneficial to use visual teaching, realistic reprodu..
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In the 100-kHz application from left to right, the coupling network feeds into the receiver ~section on the bottom of the chip. (The external components are summarized later.) The receive data output is pulled up via RPuLL ~ 10 K!l. A minimum current of 10....
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Make LED lighting that is powered directly from the AC mains (120-Volt AC), due to the lack of having any inexpensive AND safe enclosures for the circuitry. While I was gathering some old failed CFLs one day with the intention to recycle them, I realized....
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Spring reverb units are most commonly used in guitar amps, having been replaced by digital effects in most other areas. This cannot really be classed as a "real" project, because the circuitry is somewhat experimental, and may change quite dramatically....
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For a 0- to 10-V input, this circuit produces sine-wave outputs of 1 Hz to 20 kHz, with better than 0. 2% linearity. Distortion is about 0. 4% and the sine-wave output frequency and amplitude settle instantaneously to a step-input change. To calibrate, apply....
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This audio amplifier circuit is useful in classrooms to reduce the strain of lecturing, if the surrounding environment is noisy. It uses the power amplifier IC LM380 that gives 2 watts output which is sufficient in a confined area. The amplifier is portable....