Popular Circuits Page 19
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The ratio R1/R2 sets the amplitude of the triangle wave, as referenced to the square-wave output. For both waveforms, the frequency of oscillation can be determined by the equation: fo= 1/4R3C1 * R2/R1 ..
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The TPA2011D1 is a 3. 2-W high efficiency filter-free class-D Audio Power Amplifier (class-D amp) in a 1, 21 mm G— 1, 16 mm wafer chip scale package (WCSP) that requires only three external components. The TPA2011D1 is a 3. 2-W high efficiency filter-free....
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Discussion about application of microcontroler PIC16F84 both for Control or Robotics and How to make Programmer of Microcontroller PIC16F84/A. The solar engine is commonly used as an onboard power plant for BEAM-type robots. Sometime called living robots.....
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Based on the SN74LS194 - Bidirectional Universal Shift Register the circuit is designed to drive UNIPOLAR type stepper motors and provides only basic control functions - Forward, Reverse, Stop and Speed adjustment. For the purposes of this page the direction....
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Whether the tuning aid can be trusted on 70 MHz is a bit of a complex matter, but wtih me it seems to provide a suitable loading factor, when used for tuning when the attenuator is activated. This attenuator is actually a frequency dependent network of a....
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The following circuit shows about N-Channel H-bridge Motor Drive Circuit Diagram. Features: low voltage motor drives, in an N-channel ....
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Amplitude Modulation (AKA AM) was the first modulation type to impress audio on an RF carrier. Prior to this, information was transmitted via on/off keying of a continuous wave transmitter using Morse code or some equivalent. 1. Low level modulation. The....
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Circuit is shown. (1) DC power circuit power switch S3, 220v AC voltage by T Buck, UR rectifier, C3 and C4 filter, generating + 9V voltage, supply Kl drive control circuit, a b..
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This page deals with the subject of replacing the crystal in any type of Temperature Compensated Crystal Oscillator (TCXO), be it a Motorola "Channel Element", a GE "Integrated Circuit Oscillator Module" (commonly called an ICOM), or an RCA TCXO. Here we`re....
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Here is an ultra simple automatic light switch circuit for bedrooms. After construction,connect the input terminals of this circuit in parallel to the inte...
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The signal can be converted by piezoelectric films in many ways such as thermal to electrical (temperature sensor), mechanical to electrical (microphone), and...
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The circuit was designed to create an electronic siren to provide a scheme for producing an alert sound in emergency cases or any circumstances that requires its usage. 4011 a quad 2-input NAND gate integrated circuit, generally characterized by small....
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This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost Rs 8 to 15. These LEDs emit a 1000-6000mCd bright white light like....
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A, B are 2 common contact, outline drawing and pin definition. C is the infrared emission tube shape, pin definition and schematic symbol. CD4069 is the pin definition of inverter pin, and F is the 9013 transistor shape, pin definitions and symbol....
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AN6657 is a 16-pin dual in-line plastic package, AN6657S 16-pin dual flat plastic package. 1. Speed Control works with internal H-bridge driver chip circuit, 5 and 8 feet H-bridge driver output,..
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As shown in FIG grounds ISO102 and XTR101, op amp, isolated remote transmitter circuit having isolated thermocouple cold-junction compensation constituted power. The circuit co..
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I`ve been getting my mosfets from Allied too. WAY cheaper than digikey. Let me see if I...
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A project called LED Flasher which Flashes LED`s one by one . but I have following Query about my project . if anyone can explain me it in simple words it will be great help for me . one can use Below image for reference or use this link..
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I am building this for my 1969 Chevelle. Dakota Digital has something similar, but I didn`t want to spend $200 onit. Iam working on replicating the retained accessory powertoo. The capacitor (C2) & resistor (R4) connected to pins 6 & 7on the 555 timer....
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Thyristor is a switching device based on internal regenerative feedback of 2 transistors. One of the most popular type is called silicon controlled rectifier(SCR). They are basically a PNPN structure. They are very reliable and have current ratings up to a....
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This circuit provides a 50 Hz timebase signal that is independent from the power line frequency. It is designed to provide the 50 Hz signal for electronic circuits which function only with this clock frequency (mostly circuits and electronic devices with....
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I am trying to design a digitally controlled analogue oscillator. The idea is that a control voltage is generated by the a microcontroller (Arduino) which is used via the 2 op amps, resistor and capacitor network which forms a integrator circuit. The....
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Transformers made for powering large neon signs are inexpensive and very reliable. Most commonly, the secondary is center-tapped, which prevents the use of its full peak-to-peak output in applications where one of the terminals needs to be grounded. In the....
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The RGB LED driver described on this page uses logic level 'N' channel MOSFETs which allow it to control LED arrays or lamps at up to 5 amps per channel without heatsinks.
The driver uses exactly the same firmware as the small RGB LED driver shown in the....
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Current spreading bipolar output when the circuit diagram is as follows: ..
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This circuit was designed as an aid in parking the car near the garage wall when backing up. Electronics project and circuit diagram. Proximity sensor..
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Easy build and use, the general purpose Big LED with SPI serial interfacing. Expandable for multiple digits but still uses only three wires for receiving data from any uC boards. The circuit uses a serial-in-parallel out shift register, 74HC595 for receiving....
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Here is the circuit diagram of simple but highly effective TV remote jammer circuit. Most of the TV remotes have 38KHz operating frequency. A flood of IR beams in the same frequency can easily confuse the TV receiver and this is the operating principle of....
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Logic indicator circuit / logic probe is used to identify logic level at any point of logic circuitry. The indicator can be visual (using LED, LCD, of 7...
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Signal clipping is usually avoided in most application, but we can find some useful examples where clipping is intentionally employed in audio processing. One ...
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This project can be used for a quiz with up to 4 contestants (or teams). Each contestant has a trigger push-switch and LED. When a trigger switch is pressed it lights the corresponding LED, sounds the bleeper and prevents the other trigger switches from....
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This is a design circuit for a stereo amplifier for a high sensitivity stereo parabolic microphone. This circuit can be used for listening to distant sounds. Typical parabolic microphones are mono phonic, this unit has a stereo audio path that helps produce....
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This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
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The heart of this diy metal detector circuit is the CS209A IC. The metal detector is built with one 100µH coil that has 40 mm in diameter and is made....
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One LTC 1149 synchronous switching regulator can deliver both 3.3- arid 5-V outputs. The design`s simplicity, low cost, and high efficiency make it a strong contender for portable, battery-powered applications. The circuit described accepts input voltages....
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220V AC by Cl buck, VDI rectifier, VD2 regulator and filter capacitor C2, output stable 12V DC voltage for use module A2, Al through internal A2 6V regulator outputs in 6V DC v..
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The concept is that a pair of yellow LEDs are placed in an otherwise inconspicuous pumpkin, and a photo sensor allows the circuit to turn on the lights at night. The circuit itself is very straightforward, incorporating minimal components. There are two....
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VDP is the photodiode and it has low resistance in the day, and resistance ? 1k?, then transistor VT2 is turned off, then thyristor VT1 is in the off-state as the gate has no trigger current, and E can not be lit. In the night, VL shows a high resistance as....
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An external power supply that gives a voltage higher than the highest expected rating of the zener diodes to be tested is required. Potentiometer RVl is adjusted until the meter reading stabilizes..
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A low cost,simple radio circuit schematic using op amp.This radio circuit diagram consists of a sensitive audio amplifier which receives strong signals....
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Voltage Limiter Circuit Using Op-amp-Circuit Diagram, Waveform, positive and negative voltage limiters....
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This design note presents a simple yet feature loaded 16 watt output, universal AC input adapter power supply for modems, hubs or similar applications. The circuit is a discontinuous mode (DCM) flyback converter topology designed around ON Semiconductor`s....
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We assume that most of our readers are thoughtful drivers who do not switch on their rear fog lights w..
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Driving a D/A converter with an A/D converter provides an overall analog-hold function, which though limited in output resolution, offers zero voltage droop and infinite hold time. The A/D converter shown (IC1) includes a 12-bit compatible track/hold at its....
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The second method is to record (realtime) the actual bark in an analog CCD delay line (~100 msec FIFO) and upon recognition that the sound is a bark, the device plays back-through a loudspeaker-that last recorded 100 msec of bark. It really confuses them;....
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The CFL-2 is an electronic ballast design for driving
a 42 watt compact fluorescent lamp from a
120 or 230 volt AC line. The circuit was designed
using the IR2156 Ballast Driver IC. The main
features of the circuit are programmable frequency,
preheat....
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SPICE is the most commonly used analog circuit simulator today and is enormously important for the electronics industry. SPICE is a general purpose analog simulator which contains models for most circuit elements and can handle complex nonlinear circuits.....
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This simple circuit can be used to activate whatever you like, for example, by connecting it to microcontroller, relays, secret alarms, robot applications or just turn on LED1 which lights up as long as you touch the metal plate. The circuit consists of....
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Dimmer, from the word n. dim, v. to dim . Simple device to make light of incandescence lamps lower. Also, used to slow down colector motors. All this started because Lithuanian internet is full of old soviet circuits with archaic components. Meanwhile other....
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The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section..
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Here is a solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicol....
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If you are looking for a mixer with a microphone, and can easily make your own.I highly recommend this circuit.It is a....
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This DIY magnetic field sensor circuit is very simple and can detect fixed magnetic fields or fields that are varying at an audio frequency. The unit is no....
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The frequency jammer works by creating interfering RF noise, centered around the 2. 45 GHz carrier. As the power associated with the noise increases, the signal to noise ratio for the wireless communication channel decreases. This increases the bit error....
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This dimmer is used to adjust the brightness of incadescent bulbs (dimming) from zero to maximum. Regulation from zero is achieved using double delay circuit. The circuit is two-terminal connected and so it can be installed into switch box without modifying....
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This circuit makes a nice, clean preamp or a clean booster pedal. It is not designed for overdrive, but is designed to be overdrivable. If overdriven, it provides the kind of soft clipping one may expect from JFETs, but it is not optimized to be generally....
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The following touch switch circuit uses a CA3240 dual BiMOS op amp to sense small currents flowing between the contact points on a touch plate. Since this....
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A simple NiCd charger can be built using junk box` components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter composed of R3 and a transistor, it can charge as many cells as desired until a fully charged` voltage determined by the....
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The DIAC is a 28V bidirectional (bilateral) trigger device that is used on virtually all inexpensive phase controls. The trigger voltage is somewhat high for phase control of 115VAC. Years ago, there was a similar low voltage (6 to 8V) trigger device called....
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This is a very-very high power Inverter circuit which will give you very high AC power output 3000W. This inverter will convert 12 Volt DC Battery voltage into a square wave voltage of 50 cycles per second and duty cycle of 25% ..
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This circuit represents another version of an Armstrong Oscillator. This particular example uses a crystal in addition to the LC tank circuit used by the previous Series-Fed Armstrong Oscillator. By definition the Armstrong Oscillator uses a tickler coil for....
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Browse » home » alarm » circuit » explanation » latest » schematic » siren » wailing » with » latest Wailing Alarm Siren circuit Schematic with explanation *The Loudspeaker LS and the resistor marked Rx should be together 75 ohms. If you have a standard....
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The TDA7541 is a high performance Tuner circuit with stereo decoder for AM/FM car Radio It contains a mixer, IF Amplifier Demodulator for AM and FM, stereo decoder, quality detection, ISS Filter and PLL synthesizer with IF Counter on a single chip. Use of....
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This paper outlines a clear printed circuit board layout for implementation of the MAX8632 Integrated DDR Power Supply. This chip functions as an integrated DDR Power-Supply Solution that utilizes a synchronous-buck controller to generate VDDQ main rail, a 3....
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This is a 1 watt fm amplifier with a good design that can be used to amplify a rf signal in the 88 - 108 MHz band. It is very sensitive if you use good rf....
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This battery-powered metal detector uses four exclusive-OR gates contained in the 4030 CMOS integrated circuit. The gates are wired as a twin-oscillators and a search coil serves as the inductance element in one of the oscillators. When the coil is brought....
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1500A-7V-phase thyristor power regulator circuit a plating It consists of the main circuit, control circuit and the protection circuit has three major components. The control c..
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A TMOS power FET, Ql, and an LM393 comparator provide a high-efficiency rectifier circuit. When V,. exceeds V,, Ul"s output becomes high and Ql conducts. Conversely, when VB exceeds V,., the comparator output becomes low and Ql does not conduct. The....
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Because i cant get help with this in tubes/valves section, i`m opening thread here with HOPE , that SOMEONE whould be able to HELP ME. I need help....
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This circuit uses LEDs to display the beat frequency of two-tone oscillators. Only one LED is on at a time, and the apparent rotation of the dot is an exact indication of the best frequency..
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Circuit shown in Figure 3-21. It issued motor startup sound, light signal to start the process is completed, the signal stops. This circuit is adapted to drive the motor by mea..
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The orientation of the camera at launch is looking out the side of the rocket and during descent on the parachute, it is looking down. To allow the camera to look down during lift off, an external mirror can be optionally added. Located in the nose cone of....
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The schematic circuit design is for a 250 watt output, while the pics are of my 1500 watts inverter that i built, to increase the power of the circuit you have to add more of the Q7 and Q8 transistors in parallel, each pair you add will increase your power....
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Presented in this letter is a very low-power monolithic 1.9GHz silicon LNA which draws a total current of 1.75mA including bias circuit....
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Figure (a) shows the output amplifier circuit 170W at 4 loads; LM4651 is a former circuit class D amplifier, a 28-pin DIP package, the internal equivalent circuit is shown in (..
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Anatomy of the two ignition experiments, measuring the three normal ignition, found a common problem, and both ends of the ignition coil has a diode. Why manufacturers do this ..
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An automatic control maintains a lamp at a constant brightness over a wide range of supply voltages. This circuit utilizes the consistency of photodiode response to control the phase angle of power line voltage applied to the lamp and can vary the power....
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The 10K resistor (*) is only required if you want the receiver to mute (squelch) under no-signal conditions. You could add a 100K in series with this resistor to get an adjustable squelch. This circuit will JUST drive a crystal earphone or high impedance....
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The difference between these amplified signals is used to set the 's bias and hence Ql Q2 current channel. This Ql forces of V GS at all that is required voltage corresponding to the circuit input and potential output. The capacitor of 2000 pF to Al provides....
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We published a design for a stereo microphone preamplifier with balanced inputs and a phantom power supply. The heart of this circuit was a special Analog....
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This circuit shows the TP5700 directly interfacing to a low-voltage DTMF generator. VREGt supplies the necessary 2-V minimum bias to enable the TP5380 to sense key closures and pull its mute output high. VREGt then switches to a 3-V regulated output to....
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Circuit shown in FIG. 3 + 20. Figure, SBi as the start button, SB2 is the stop button, Hi to run lights, Hz as down lights. In the circuit described later, in order to avoid te..
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Make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is correct or not [let`s assume we are driving our device in a bright....
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