Popular Circuits Page 115
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Relays are often used as electrically controlled switches. Unlike transistors, their switch contacts are electrically isolated from the control input. On the other hand, the power dissipation in a relay coil may be unattractive for battery-operated....
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Built around an Intersil 7216 frequency-counter IC, this counter has a basic range of 10 MHz, a 100-MHz prescaler, and an..
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Biaxial magnetic field sensor application circuit as shown in FIG. Using a biaxial magnetic sensor HMC1002, two AMP04 (A1, A2), the magnetic field can simultaneously measure th..
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The ARMSTRONG OSCILLATOR is used to produce a sine-wave output of constant amplitude and of fairly constant frequency within the rf range. It is generally used as a local oscillator in receivers, as a source in signal generators, and as a radio-frequency....
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This section gives step-by-step instructions along with photos to the construction of Ultrasonic Proximity Transmitter. Because this is a very simple circuit, only a schematic for the sensor is shown here: (For the PDF format click here. ) This tutorial`s....
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Sip-and-Puff (SNP) controllers are nothing new - you`ve probably seen one in action yourself. SNPs are often seen on electric wheelchairs and allow individuals who can`t use their hands to control their wheelchairs (or whatever else) by either "sipping"....
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DF data transmission module operates at 315MHz, the use of surface acoustic wave resonator SAW frequency stabilization, high frequency stability. When the ambient temperature i..
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The three-tone electronic doorbell circuit consists of the coding triggered circuit, multi-tone generator and audio amplifier circuit, and it is shown in Figure 3-110. Coding trigger circuit is composed of the buttons Sl-S6, two four-input AND gate (DI, D2)....
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Pushing on P1 resets IC2 that start oscillating at a frequency fixed by R3 & C1. With values shown, this frequency is around 4Hz. LED D2, driven by IC1A & B, flashing at the same oscillator frequency, will signal proper circuit operation. SW1 selects the....
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A circuit to turn on/off a couple of big AC solenoid valves and a couple of 1ph ac motors. my line v is 132VAC and the solenoids measure 1A and the motors measure 13A and 27A once running. does anyone know how to do this with triacs they are much cheaper....
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The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof....
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Both oscillators are built using MPF102 or J310 FETs. The Mixer is BF998 dual gate MOSFET. Audio IC amplifier is LM386 which drives a speaker. I have used a stabilized supply for two oscillators and mixer. U1, a 78L05 is doing this job nicely. ..
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A basic UUS 65 73 MHz fm transmitter circuit schematic which can be used as UUS oscillator with no explanation 65 - 73 MHz transmitter ( oscillator ) c....
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The CM-CU21 is a high quality, portable Commentator Unit. Its sturdy construction and flexibility of features make it suitable for use in a wide variety of environments. It provides two fully featured commentator positions and a third guest position that can....
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The circuit uses a 555 timer IC to power an ultrabright LED. The output is a pulsing red light that can be projected using lenses. An ultrabright Stanley LED, capable of 300-millicandle output, is tied to pin 3 of the 555 timer IC. That IC has been....
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This article describes the use of super-regenerative FM receiver FM receiver principle, due to the use of high gain miniature ..
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Figure A is an R/2R resistor ladder. Each switch that is closed increases the amount of current at. A simple channel A/D converter is shown in Fig. B. The voltage reference (D2) is common to all channels, but-the value of the dropping resistor (R9) varies as....
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Here is simple function generator. Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in...
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This is BTL(bridged tied load) mono amplifier with DC volume Control circuit. This circuit uses TDA7052A/AT that is suitable not only for monitors and TV but also battery fed portable radios and recorders. The difference between conventional DC volume....
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It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when you re building this sort of electronic thermostat. There are a lot of handy uses for a thermally controlled switch.....
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This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I`ve added a timed Siren cut-off and automatic Reset. I`ve also replaced the LED with an entry Buzzer. These enhancements....
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The circuit integrated la3607 allows to just set up a graphic equalizer of 7 bands for a channel adding some capacitors and variable resistors to the circuit. The cut frequency can be adjusted using variable resistors. It possesses high stability for loads....
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Circuit works: When the patient usually upright, packed in kit SQ mercury switch was turned off,..
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FM302E-I-type FM transmitter exciter is the NEC Corporation, Japan`s HPB with a 1210 motherboard. Direct frequency modulation of the carrier, using phase-locked frequency stabilization and frequency synthesis. The front power amplifier (BLF-177 FET) ....
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As shown in the timing control circuit is a sequential circuit, the circuit can be carried out sequentially timed control of the two switches, control time can be adjusted from..
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As shown in the Sony KV-S29MHl (S movement series) TV switching power supply (SIR a 80145A) circuit; (A) is the power oscillation part; (b) is the regulator part; (c) is the output section...
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The M7 capsule is a center-terminated, dual-diaphragm design, and supports three polar patterns. A switch on the power supply allows selection of Cardioid, Figure-of-8, or Omnidirectional patterns. The amplifier circuit is similar to some of Gefell`s....
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Tone control of audio systems involves altering the flat response in order to attain more low frequencies or more high ones, dependent upon listener preference...
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Uses a low cost CMOS IC to tum four LEDs on and off at a rate that is set by the values of R1, R2, Cl, and C2. The pulse rate for the component values given for R1 and R2 is about one cycle every four seconds. By lowering the values of Rl and R2 to 220 KO,....
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Build your own arc welder! Many of you have been so patiently waiting the arrival of these DETAILED PLANS that you can purchase and download (4. 6MB pdf!)for a small fee...
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The most glaring ommision was that the DRUID did not accept confirm codes (ie the solution to the clue) and did not give directions to the next cluesite. Instead teams had to call in and confirm with Game Control in order to find out their next destination.....
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As shown in the circuit as a precision bright light control circuit, its work is not affected by the power supply voltage and ambient temperature. Resistors R1, R2, R6 and phot..
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This board does NOT use the CTS256AL2 text-to-speech chip. [It would seem that both SpeechChips.com and JDR still have some of these chips, though, if you're looking for some.] However, you could easily use this board to hold the SPO chip and amplifier and....
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While smoke alarms are quite cheap devices, the cost of 9V batteries quickly exceeds their purchase price. Added to that is the irritation of random beeps....
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The project described in this article is a constant Q, fully expandable graphic equaliser. Where most "conventional" graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings. This is achieved by....
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The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up and amplified by the electret microphone is fed into the audio amplifier stage built around the first transistor. Output from the collector is fed into....
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This is a design circuit for alarm circuit. This circuit is controlled by keypad. For the core of the circuit is using a single transistor with BC547 series. This is the figure of the circuit. For operation, on a 12-key pad, look for 13 terminals. The matrix....
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The high and low voltage cut-off with delay and alarm circuit with circuit diagram is explained in this post....
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Circuit works: two self-test table contact pads sensed across the skin to the electric pressure changes lC input of 5 feet, can drive 10 LED (present circuit only with 5 LED). When the voltage is 5 feet 150 mV, LED1 light; when the voltage elevated to 650....
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LM4880 is HiFi dual audio amplifier IC from National Semiconductors. This IC is specifically designed to produce high quality audio output with a minimum number of external components. LM4880 is capable of delivering 250mW per channel into an 8 ohm load. The....
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Simple frequency meter or frequency counter circuit with LCD display and Avr micro controller.DIY schematic circuit diagram & embedded c code....
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The advent of new high-speed technologies and the growing computer capacity provided realistic opportunity for new cost effective technologies and realization of new methods of innovations. This technical improvement together with the need for high....
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In this circuit, CI is charged to a fixed reference level, then discharged. Integrator ICl circuit charg..
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The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains failure and battery charger with overcharge protection. When mains is absent, relay RL2 is in deenergised state, feeding....
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This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery-powered systems. Using a combination of a high current TRIAC and a very sensitive low current SCR,....
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Build your own a personal data logger for recording analog signal. The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL....
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As shown for the three astable circuit. From this circuit can be seen, each level of the base of the transistor by a capacitor connected between the two levels are tightly coup..
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Application circuit works the device as shown below. For cooling electrical equipment, usually with a cooling fan to drive heat. LCE made use synchronous control socket on the ..
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This 12 VDC to 240 VAC Inverter circuit are not using special components such as the torodial transformer found in many inverters circuit....
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In many cases, the dimmer presented here may be built into a wall-mounted box containing the light switch. It is intended for use with 240 V incandescent lamps only. When it is fitted, and the light is switched on, the lamp does not come on fully for about....
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An Operational amplifier based sine wave generator circuit, it is basically a wein bridge oscillator. Because of its simplicity and stability, one of the most commonly used audio frequency oscillator is wein-bridge. The wein bridge oscillator in which the....
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Circuit shown in Figure 3-151. Figure 3-151 (a) of the capacitor banks connected into shape,..
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Valves are enjoying increasing popularity in audio systems. With the European E` series of valves, such as the ECC83 (12AX7) and EL84 (6BQ5), the filament voltage is 6. 3 V. Depending on how the circuit is wired, the ECC 81 83 series of twin triodes can also....
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Circuit audio peak indicator circuit schematics Circuit Electronics, Schematics for audio peak indicator circuit Circuit Electronics....
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The LED Metronome is a modern interpretation of a classic device which is a staple of music teachers, students and composers everywhere. This circuit uses 12 LEDs to simulate the sweeping motion of the pendulum and a speaker with a simple amplifier to....
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Squarer circuit is used to shape signal, to get more defined square wave. This circuit is useful to make convert the signal so it has very fast rise time. Here....
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This constant current constant voltage SMPS can be used to efficiently charge a battery. This circuit gives 7. 2V at constant voltage mode, and 600 mA at constant current mode. Here is the schematic diagram of the circuit: The mechanism is simple, when the....
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The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and....
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A simple circuit of a stopwatch that can count up to 99 seconds. The circuit uses CD4060, CD4013, CD4033, LTS543 and some discrete components. A crystal-controlled oscillator generates 1Hz pulses. A 32. 768kHz miniature crystal is used for the purpose. IC....
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It uses pattern SH803 flash IC, within reservoir eight kinds of programs and a variety of dimming, change the speed of light,..
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This is a circuit of a microcontroller AT89S52 Thermometer and 12-bit ADC LTC1298, programs written in the language c program with digital filtering and interface the LED display. The reading provides 0. 1C sensitivity. The hardware block and circuit diagram....
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This machine was near-and-dear to me as it was my first real computer, an Ohio Scientific Superboard II. In 1979 I got my machine, a 6502-based single-board computer with a whopping 8K of RAM and BASIC in ROM. The board was completely self-contained,....
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Using this simple resistor circuit, you can trick your oscilloscope into displayin..
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The interface uses a PIC16F876 microcontroller and not much else. It performs channel mixing, current limiting, and noise rejection. Push the stick forward, both motors move forward, move the stick to the left and the robot moves left. It makes the robot....
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Current-control switching-mode power supplies (SMPS) are gaining in popularity because they allow pulse-by-pulse current control and monitoring, making them more reliable and robust than their voltage-controlled counterparts. Current control also eliminates....
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That`s right, Electric is open source! You can download Electric from the web for free.There is no better way to get to know a CAD system than to use it for a while. Now you can use it at no charge! If you like it, keep it! If you don`t, you`ve lost....
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Controller for Hybrid Power Plant block diagram of the HPP, comprised of 440 Wp photovoltaic modules, 1 kW wind turbine and 5 kW diesel engine as a back-up. HPP is a centralized PV and wind power generation plant, using battery to store the produced dc....
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The circuit features automatic Exit and Entry delays, timed Bell Cut-off and System Reset. It has provision for normally-open and normally-closed switches and will suit the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and....
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The variable frequency power supply, as the important constituent element of the power system, the quality of its characteristic concerns security and reliability index of the overall system directly. Such prominent advantages as the modern variable....
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The sine wave generator composed of inverter is shown as the chart. The circuit could get high stable sine wave in more than a few MHz. In the figure, A1 and the crystal oscillator form a oscillating circuit, the output of A1 becomes sine wave signal after....
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The circuit in Figure 1 shows an example of how you can use an integrated switching regulator (ISR) to efficiently vary the speed of a permanent-magnet dc motor. In this application, the rotating head of a robot senses the presence of an oncoming object....
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Schaer is a generic programmer circuit capable of uploading and downloading firmware to/from several electronic devices like microcontrollers a....
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This threads explains how I`ve made my custom USB tyre pressure monitoring system by hacking this aftermarket kit bought on eBay. The first step was....
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As shown in FIG constituted by INA217 professional miniature microphone (microphone) typical preamp circuit. FIG set a switch for selecting whether the choice of phantom power ..
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C1/C2`s working voltage ought to be elevated to 25V in the event you decide to go with a 12V power source. Rule of thumb: the operating voltage of capacitors are at least double the supplied voltage, in other words, if the power source is 9 Volt, your....
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This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today....
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A simple ambit for converting an audio arresting (such as one that comes from the apostle terminals of a CD player). The ambit basically consists of a buffer/amplifier date and three clarify circuits: a high-pass filter, a mid-pass filter, and a low-pass....
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In order to ensure that the transistor in the circuit to work properly, it is often the reverse breakdown voltage of the transistor to be measured...
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Gather statistic about the electricity usage at my new house, mainly to see how much using the fireplace lowers the bill. The meter installed by the utility company has a led that blinks at the speed that is relative to the usage. Text on the meter says that....
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Figure 1 shows how to digitally program the on-time of a one-shot multivibrator circuit. More and more, the Internet is playing a role in control operations in industrial and R&D endeavors and in household appliances. One-shot circuits are popular....
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I was originally going to develop a minimum part count version of the EH Electric Mistress. Instead I went for a something with the versatility of an MXR flanger and the extra wide sweep that the A/DA flanger was known for. It needed an extra chip to get the....
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The circuit diagram shows the original Kodax MAX Flash Unit including the semiconductors that built the circuit. The shown circuit diagram is the unmodified one which is for the regular Kodak and the Kodak Max that should be very similar if not identical.....
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Using a battery power source the TENS device produces a high voltage but low current signal at a specified frequency and duration. This electrical current is applied externally to the skin of the body using sticky foam electrode pads. The more expensive....
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The charger is built around a single LTC®1541,
which contains a voltage reference, op amp and comparator.
The high accuracy voltage reference (±0.4%) regulates
the battery float voltage to ±1.2%, as required by most
Lithium-Ion battery manufacturers...
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These two circuits are interesting from an academic point of view. Their practical implementation is rather critical and it is not easy to get steady operation. Circuit (a) requires a "cooked" zener: connect it first to a constant current generator, then....
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Simple and easy to do single flashlight battery DC-DC driver circuit and leave the battery production. Figure Parametric voltage 1.5V,..
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The first example uses the standard op-amp oscillator circuit to generate a triangular waveform which is level-shifted and fed to a comparator (e. g. LM339) to give the PWM waveform. Most people will want to use two comparators rather than one op-amp and one....
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Rf = 100 k preset - The slider is set about a quarter of the way round. This is used to control the gain. The gain should be as small as possible consistent with the oscillator starting up reliably. The zener diodes limit the oscillator output by decreasing....