Popular Circuits Page 33
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The Wien-Bridge oscillator fulfills these requirements because there is a low pass filter, a high pass filter and a 180 deg. phase shift from the feedback networks from the input to output. This totals 360 deg. to start the circuit oscillating. If all three....
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This smoke detector uses a MEM 817 p-channel enhancement mode MOSFET as its buffer amplifier. Operation of the sensor is based on a decrease in the current when smoke enters the chamber, thereby causing a negative voltage excursion at the gate of the....
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The temperature sensor U2 needs to be located next to the item being monitored. As the temperature increases the motor duty cycle will increase. D1 and R2 are optical components, they only need to be installed for a visual indication of the current duty....
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The circuit accepts two positive-voltage inputs VN and Vv and provides a TTL-compatible output pulse train whose repetition mte is proportional to the ratio VN/ V0. Full-scale output frequency is about 100 Hz, and linearity error is below 0.5 percent. The....
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The Digital Counter Circuit is an electronic project that converts digital numbers (0-9) to binary (0-1). If you want to understand binary code, please click on "Binary Code PPT" to view a PowerPoint on Binary Code. Below is the Parts List, Schematic, and....
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The on thing every spy needs is a small and well concealed listening device. The FM Listening Bug Kit gives you all you need to build a small, single....
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The PIC16F870 chosen for this project has seval analog channels. One of these is used to capture the DTMF tones and decode the digits. The actual phone connections are made using a 'hacked' 5 line expandor from Radio Shack. This device connects between....
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When we step on the car' s brake, then together with the classic rear STOP ,the third STOP which is situated in the middle of the back half of the car also switches ON. This is the classic function , is to be found in all modern cars. The difference with the....
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This circuit allows an SPST momentary pushbutton to act as a push-on push-off switch, using a DPDT latching (bi-stable) relay. It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function. The....
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Wireless IR headphone transmitter. Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. The VCO output drives Q1, a switching transistor. Q1 drives two IR LEDs. The...
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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....
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Thomas Edison developed the incandescent light bulb, which operated from a 110 volt DC source. The primary drawback to DC power was that it could only be distributed over short distances without having to be regenerated. In the early 1900s when Nicoli Tesla....
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A low noise circuit equipped with a variable voltage-gain (10 - 100) pre-set, primarily intended as high quality microphone input, also suitable for low-level line input. Tone Control Module: a three-band (Bass, Middle, Treble) tone control circuit providing....
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This device contains a ringing generator and a tone oscillator. The tone oscillator is set to either 350 or 440 Hz. The ringing generator is a potted module delivering 86 Vac at 20 Hz. It is available from a source listed in the reference. (View) At the....
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You can turn any ordinary household bulb into one that shimmers or blinks. This circuit works on any incandescent light up to 200 W, arid runs on standard 120 Vac. The circuit uses an SCR to cause an ordinary lamp to sliimmer. Note that one side of the lamp....
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Originally Posted by Pano Like putting milk and sugar in your coffee. Next time by, your Turkish coffee comes with no sugar dave....
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220V AC via a resistor Rl buck, VDI rectifier, VD2 and c5 filtered output voltage of approximately 9V DC voltage supply manifold electricity. R3 for the manifold input AC synch..
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Here is the circuit diagram of a 741 IC based 3 input mic mixer ckt. Altogether four 741 IC`s are used out of which IC1, IC2, and IC3...
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The 7208 seven-stage decimal counter can be used as the frequency counter, it has the latch and multiplexing functions, and it has the direct digital driving circuit and the display driving circuit. 7207IC 6.5536MHZ crystal oscillator`s output frequency is....
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This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus....
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This circuit is configured for the 80m band. The 365-pF, broadcast-band variable capacitor should have a vernier drive with a six-to-one ratio, which makes tuning easier by separating the stations on the dial. A good antenna and ground are also....
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The LT®1462/LT1464 duals and the LT1463/LT1465 quads
are the first micropower op amps to offer picoampere input
bias currents and unity-gain stability when driving capacitive
loads. For each amplifier, the LT1462/LT1463 consume
only 28mA of supply....
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This is a low cost fm antenna booster that can be used to listen to program from distant FM stations clearly. The antenna fm booster circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570 (C2570). This is the....
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A column-parallel analog-to-digital converter was designed for use with CMOS active pixel sensors (APS). The design goals included simplicity, small size, moderate speed (>10kHz), current input, and reasonable accuracy (6-bits). The ADC was designed to get a....
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As shown in the circuit diagram SF04E emission and SF04B thereof. (A) shows a remote control transmitter SF04E composition, and it receives the matching circuit can SJ04H assem..
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This article discuss how you can detect the entry of a person in a room and get this signal inside your MCU. This is NOT a complete project but just an idea that can be implemented in many different projects. The technique is to use use an IR transmitter and....
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A truly timeless circuit. LM317 is a versatile and highly efficient 1.2-37V voltage regulator that can provide up to 1.5A of current with a large heat sink. It`s ideal for just about any application. This was my first workbench power supply and I still use....
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In this project, 8 LEDs are connected to PORT B of a PIC microcontroller. Also a push-button switch is connected to bit 0 of PORT A using a pull-up resistor. When the switch is pressed the LEDs scroll to the right. The circuit diagram of the project is shown....
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before proceeding to this steps make sure that you already done software calibration and the basic steps on how to check audio circuit components which I already explained here: I also preferred the audio circuit schematic diagram, for easy tracking, by....
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The Sentient City Survival Kit is a project of Creative Capital. It is sponsored by the New York State Council on the Arts (NYSCA) and the Office of the Vice President for Research at the University at Buffalo. Additional support provided by the Network....
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This is an evaluation use of a small graphics LCD module. Last summer, SG12232C graphic LCD module has been sold sold for 1500 Yens from Akizuki Denshi and I bought it. However I could not find good application for the LCD module and it was going to go to....
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The GT4123 and GT4123A are the first dedicated single
device, two input video mixer ICs available to the professional
video and multimedia markets. Each input signal is applied to a conventional differential
amplifier (AMP A and AMP B). From the....
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Boss MT2 Metal Zone Distortion Pedal Schematic. The MT-2 Metal pedal is one the most popular guitar pedals, providing over-the-top, insane distortion tones with huge mids and lows and an ultra-saturated sound....
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Common-emitter amplifier V502, V504, V506 emitter static potential bias voltage forming circuit [ie voltage follower) shown in Figure 3. Active filter by the V507, VD502, VD503..
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The first thing you must have in your workshop/lab is power supply. In experimenting many new electronic circuit design, it is easier if you have a flexible adjustable power supply. Here is an adjustable 0-30 volts power supply design. The circuit schematic....
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The circuit generates this type of Geo-magnetic-fields and lets us perceive them: in this manner our brain is surrounded by an ideal environment for a sound sleep. With SW2 opened (Alternate mode operation) the device operates for the pre-set time, then....
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Bipolar digital multiplier has output polarity controlled by offset-binary-coded digital input word. Precision Monolithics DAC-08 D/A converter drives OP-02 opamp. 0utput is symmetrical about ground. -J. Schoeff and D. Soderquist, Differential and....
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I have developed an inexpensive control system (less than $70) that can be used to both get more cutting power out of a DC discharge laser and significantly improve cutting accuracy for home built laser systems. The control system implements a control....
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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Unlike almost all SMD resistors, the SMD ceramic capacitors are not marked with their values. To find the value of these capacitors we need a capacitance meter....
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The goal of the project is to create a robot that will follow a black line on a white sheet of paper and solve a maze created out of those materials. The project also included a list of specifications that were to be followed. These specifications are: The....
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Most current microprocessors, DSPs, and field-programmable gate arrays integrate hardware and software resources that support either or both of two common interface standardsSPI (serial-peripheral interface) and I2C (inter-IC)/SMBus. Both two-wire-interface....
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The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1).
This circuit is based on the fact that a....
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The LM101A provides gain and buffers the input from storage capacitor C2. R2 adds a zero in the open loop response to compensate for the pole caused by the switch resistance and C2, improving the closed-loop stability. R1 provides a slight delay in the....
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Circuit shown in Figure 3-96. Figure, SBz is running at low speed button, SBi as the high-speed operation button. SB3 for the stop button. In this circuit, a motor connected in..
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The whole Construction : You can call the transceiver like this as "OZL type". Characteristics of the "OZL type" are as follows.
1. Single conversion super.
2. Using two DBM-s as modulator and converter.
3. Modulator DBM is used as demodulator in....
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The classic Rangemaster is thought to have been the source of some of the best tones in rock guitar, from Clapton`s Beano sound to some of Brian May`s singing sustain tones. While the effect is a simple one-transistor booster, locating a good quality....
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Circuit principle: computers AC power load is large, the use of the current transformer current sensing. It can be used to detect whether a current power line, determine its st..
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A very simple high power alarm driver electronic project can be designed using this circuit diagram. This high power alarm driver electronic project is based on low power SCR which trigger a high power SCR. When a switch is opening (S2, S3, S4) or closing....
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Two aluminum rods, each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna...
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The circuit of Fig. 1 provides an easy yet reliable way to detect the intensity of a. c. (or e. l. f. ) fields around the home or workplace. It is doubly effective because it does not merely detect the electromagnetic radiation emitted by electrical....
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Figure shows a great project / schematic of a 12V solar LED night activated lamp circuit. This is a versatile project and can be used for variety of purposes. For example you can use it as a great automatic solar garden light and this can be done easily by....
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12W Audio Power Amplifier Circuit Diagram. Features: small power amplifier, very good quality of sound, combines a completed very good quality ....
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This circuit is a circuit diagram is included in the RF circuit. FM Transmitter circuit diagram using the IC BH1417. Where the integrated circuit design from RHOM which includes many features in one small package. He came with pre-emphasis, limiter so that....
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We can also operate TDA8932B/33(B) from a symmetrical supply. On this diagram, three half supply voltage buffers are disabled. When supplied from a symmetrical....
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A dual audio amplifier that will deliver 50 W per channel is shown in the schematic. It includes preamp and tone controls, and also includes a headphone amplifier. ..
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Stepper motor controller is needed to run a stepper motor, since a stepper motor cannot work by just connecting it to a power supply. ?To program a stepper...
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This is implemented as a windows service that detects any power event (Suspend, Hibernate, Reboot, Shutdown) and can send a proper response to the control circuit (Heartbeat or Kill). The trigger is also controlled via Ignition Power so that the amp will....
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This circuit is an AGC system for audio-frequency signals. AGC systems usually consist of three parts: an amplifier, rectifier, and controlled impedance. In this circuit the functions of an amplifier and a rectifier are performed by a single op amp. This....
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The waa-waa effect is achieved as certain frequencies are amplified more than others. A phase shift RC oscillator makes up the basic circuit. Negative feedback is obtained by feeding part of the signal back to the base. When adjusting initially, RV1 is....
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With the wide application of Flash technology on the microprocessor, make the one-chip computer have revolutionary changes in developing and employing the means, from the traditional simulator ICE Popular JTAG up till now, designers are looking for lower....
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The digital time clock is circuit that electronic amateurs are most interested. And The clock ICs that most popular are LM8361, MM5387, Unfortunately these ICs....
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The circuit will provide a 20 ±0.1 dB voltage gain from 500 kHz to 50 MHz. The low-frequency response of the amplifier can be extended by increasing the value of the 0.05-JLF capacitor connected in series with the input terminal. This circuit will yield....
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In many applications, it`s desirable to disable LEDs used for system verification. Many options are available for the disabling function, including manual SPST (single-pole single-throw) switches, enhancement- and depletion-mode MOSFETs, bipolar-junction....
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The basic ANALOG TO DIGITAL (A/D) CONVERTER CIRCUIT has already been explained in an earlier post. Apart from it, there are also many types of monolithic analog to digital converters, such as the integrating A/D, integrating A/D with three-stage outputs, and....
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I`m working on a project with a PIC to communicate with the Raymarine SeaTalk bus. The link below is the part of the schematic diagram of a Raymarine instrument. The logic chip is connected to the TX and RX connections on the right, and the SeaTalk signals....
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This house FM transmitter for your stereo or any other amplifier provides a good signal strength up to a distance of 500 meters with a power output of about 200 mW. It works off a 9V battery. The audio-frequency modulation stage is built around transistor....
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The circuit lowers the effective peak current of the output PUT, Q2. By allowing the capacitor to charge with high gate voltage and periodically lowering gate voltage, when Ql fires, the timing resistor can be a value which supplies a much lower current than....
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Automatic alarm circuit includes a DTMF Automatic dialing, password control circuit, voice detection and alarm circuit, telephone interface circuit, power supply circuit and th..
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an electronic project to construct an LC meter project kit of exceptional accuracy to measure both inductance and capacitance - an inductance meter and capacitance meter all in one unit. It also is readily available as a comparatively inexpensive kit which....
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The ubiquitous 555 timer, (hooked up for variable mark/space ratio, if you build one you`ll find out why it`s needed), and a couple of D type flip-flops, (4013), to provide the count for the ULN2003 stepper motor driver. (ULN2003`s might be hard to find off....
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The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
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This is aquiz bell/alarm circuit. This circuit indicate fastest finger first . This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees approx mid-rail....
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Described in this article is a band-pass filter is a circuit diagram of transistors, as shown below. ..
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A 2001 monte carlo. the only thing that will work is the lights. no radio no wipers noturn signals, none of the dash lights will come on when you turn the key on, i was told that my computer systym was out of sync. how would you go about resetting this....
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The circuit outputs power to the drive motor when one or no sheets are being fed, but interrupts motor power when two or more superimposed sheets pass through the optodetector slot. The optodetector can be either an H2aB darlington interruptor module or an....
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This circuit consists of a 2048 radio remote control transmitter and the corresponding wireless receiver with very high reception sensitivity and low consumption. The combination of the two above gives a high-reliability remote control, ideal for security....
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High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. The frequency can be controlled using....
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The reson this was made this was, was to make first installation fast an a local freiend 10km away, so i cuold start real life testing, so bugs and problems can be solved before this is gived free to all other users. Software is not complete yet, all is....
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Here I will post some cool looking, challenging yet extremely fun electronic circuits you can build. I studied Electronics most of my life, since I was in middle school electronics have been my passion and have been creating some circuits since then. Most of....
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The automatic sprinkler controller circuit is composed of the +12 V power supply circuit, light control circuit and irrigation control circuit, and the circuit is shown as the Figure. +12 V power supply circuit is composed of the knife switch Q, fuse FU2,....
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The circuit uses one-half of a dual D flip-flop as an inverter. When the input decreases, the flip-flop resets, and its Q output increases. When the input increases, the reset line is released and Q gets clocked low. The rc delay between applying the input....