Top Circuits Page 192
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It`s a miniature 10/100-MbBit Ethernet module that includes an integrated microcontroller. Price is less than $60 a pop. With its minimal dimensions of 1. 38-in. x 2. 16-in. (34. 5-mm x 54-mm) the communications module can be used for compact designs such as....
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Atmel joins NXP, ST, Luminary Micro (now TI), and Toshiba as a microcontroller vendor to use the ARM Cortex-M3processor core. As a presumed replacement for some of their ARM 7 based MCU products, Atmel`s first Cortex-M3aims to differentiate from the rest by....
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Freescale Semiconductor has unveiled at the Freescale Technology Forum in Tokyo what it says is the industry`s first tire pressure monitoring system (TPMS) containing a capacitive pressure sensor for ultra-low-power consumption and precise sensing. "By using....
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As with your square wave, you will interfere with people`s radios, & they will become quite upset, plus you may attract the attention of the licencing authority-& believe me, you don`t want that! you need I believe a colpits oscilator, this will have a "tank....
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Sense the amount of ambient light and switch the lights on when it was dark out. I was successful in building one on a bread board that used an lm324 (its the only comparator radioshack had) some resistors a trimmer resistor and a photocell. So I went and....
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Looking at different ways to do current sensing, using regular opamps, rather than dedicated chips like the MAX4073T/F/H, which work well, they are just rather expensive. So while poking around i found an article written by Bob Pease, , which talks about....
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I`m using regular analog control via pots, though will use digital readouts of voltage/current. Anyhow. I HAVE watched the PSU videos, but at least in simulations I couldn`t get the single-LT308x with the transistor limiter to work properly (one, it didn`t....
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I need to make a square-wave with variable frequency, but 50% duty cycle. The 555 timer seemed like a good idea, but with the normal astable multivibrator circuit you see everywhere, changing the frequency always ends up changing the duty cycle a bit.....
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The input cap for The phototransistor at the bottom is what feeds the opamp. But the output from the phototransistor is always between GND and Vcc. So why the need for an input capacitor It`s most likely there because the photo transistor is not being....
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A 20 Band EQ for my 900Watt MOSFET Power Amplifier. The Output Level would drop by the Ammount of resistors, so for 2 Equal Resistors, I should amplify it by a gainof 3. Would that propably work Eek, that is very confusing. The first schematic is a simple EQ....
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A 2 diode selector circuit if your primary voltage source is greater than the diodes turn on voltage and the input voltage of the second diode. Schottky diodes are recommended for both their low lower turn on voltage (typically 0. 4v) and high switching....
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A TRIAC driver board for use with my reflow toaster oven project, which means mains voltages. IPC-2221 says that U. S. mains voltages require 0. 4mm clearance if coated with solder mask. A few questions: Can I run overlapping tracks on both sides of the....
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Previously I used a linear regulator, now I use Max756 ( ) boost converter. I`m seeing 0. 1 - 0. 3V output ripple in the current. The Max756 datasheet says I should expect about 50 mA ripple. So my power is a little noisier than expected, but my real problem....
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The voltage range will be 0V to 24V and I don`t expect to use any more than 4A. A micro and LCD could probably be added to measure voltage and current. Here is the schematic: Basically the circuit looks more or less OK. Regarding the voltage setting....
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The past experiences was pretty difficult, because the car horns have an inductive charge and it takes 12A and peak may be at 20 or 30A. The current electronic system is not reliable at all. It`s a lot of intensity. I need to dissipate 240W => 0. 3 x 240 =....
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Yes, it does charge the inductor again. Diodes are a good that they will not charge the inductor back but of course dissipate fair amount of instantaneous power due to the forward voltage drop. One way would be to monitor the current and stop driving those....
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Here`s a simple schematic of one of the parts, the idea is that if the probed voltage is below half point, one LED will be on, otherwise second one will be on. Also, now I think I`ll need to oompff the power on this thing, proper dc motor with some gearbox....
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It`s a little late to calculate ohm`s law right now, as far as I can see 24V/2A should dissipate 1, 88W in the 0, 47 ohm resistor and 4W in the 0, 1 ohm resistor. I wouldn`t use the Lm723 chip. The Fairchild uA723 was amongst the earliest analog ICs - it....
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The half linear design is simply so you can get away with small thermal considerations, if the linear only needs to handle 1-5w in place of the full 75w per rail. as for the MOSFET to regulate with them means operating them in there linear region, just below....
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There are plans to make it 1Gsps in the future, using interleaved ADCs and staggered clock, but that`s beyond me at the moment, so the first iteration will only have 100Msps (fastest from single ADC). The part I`m most unsure about is the analog front end,....
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A small Tesla Coil (12" range), Jacobs Ladder or a "Antigravity Project" from the book `Electronic Gadgets for the Evil Genius`, but I am having a very hard time locating part for these projects. It is a nice book but there project cost estimate is way of....
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Crap, the sensor on my clone is low resistance and the replacement heater is 45 Ohms. Is there anywhere you can buy the clone heaters or modify the station to accomodate the genuine heater Going home for the holiday week but the circuit inside last I looked....
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Feedback Oscillator Positive feedback is used in oscillators to maintain running or oscillating. An oscillator is basically an amplifier which has a feedb....
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Insulated-gate bipolar transistors (IGBTs) require full protection to avoid damage and failures resulting from conditions such as short circuits, overloads and overvoltages. The protection is key to ensuring safe and stable power-converter operations in....
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This application note discusses the application of Avago Technologies` MGA-675T6 for 5-6 GHz application. The MGA-675T6 is integrated internally with shutdown and biasing circuitry. Besides reducing the complexity of the external circuitry, the shutdown....
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The circuit was designed to create an electronic oscillator known as Wien Bridge Oscillator which can be used for the creation of low frequency sine wave....
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The circuit was designed to produce an indication before a 12 V lead acid battery would reach the discharged state LM723 a positive NPN standard voltage....
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The circuit illustrates the use of 3 frequencies to produce a graphic equalizer that will be used for acoustic signals. Equalizer a passive or an active....
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The circuit was designed to create a power amplifier circuit that will utilize E80CC and EL34 vacuum tubes for better results while providing 35 Watts of....
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Wideband a transmission or communication channel or medium which consists of a wider bandwidth than one voice channel with a carrier wave of a certain modulated frequency and is capable of transmitting more information than narrowband but less than broadband....
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Tuned circuits consist of C4, L1, C8, L3, and the two 15 pF trimmer capacitors across the collectors and emitters of both transistors. Other NPN transistors like BC54, 2N3642, 43, etc should also work. The circuit is designed for simplicity, so No Audio ....
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This 555 timer based circuit is a kind of voltmeter, also an analog to digital converter, that converts the analog input voltage to digital output pulses ..
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The circuit was designed to create a frequency generator that consists of 7 steps during the operation. Crystal Oscillator an electronic circuit made of....
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The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply Oscillator an electronic ci....
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The circuit was designed to be able to obtain signals via amplitude modulation where the sensitivity and selectivity is fairly good. Amplitude Modulation....
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The main component used is the ACS712 sensor from Allegro MicroSystems to measure the current. It provides economical and precise solutions for AC or DC current sensing in industrial, commercial and communications systems. Located near the surface of the die....
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The circuit was constructed around the functionality of a Class A amplifier to create a headphone circuit. BC308 an epitaxial planar PNP transistor used....
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The circuit was designed to produce a preamplifier with symmetrical audio input while the output operates in Class A type. Preamplifier (pre-amp) a devi....
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The circuit was based on a single operational amplifier integrated circuit that is made to produce a modular preamplifier which functions in the Class A o....
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The circuit was designed to create a frequency convert with the use of a crystal oscillator for the conversion of 10 MHz to 1 MHz. 7404 a hex inverter u....
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1N4001 a 1Amp Silicon rectifier with voltage range of 50 to 1000 Volts and possessing features such as guaranteed high temperature soldering, high current capability, diffused junction, low reverse leakage, utilizes void-free molded plastic technique for low....
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The objective of the circuit is to build an electronic dice based on the functions of a 555 timer integrated circuit that operates in the astable mode. LM....
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The circuit was designed to illustrate the use of tone control circuit by which the audio signals are adjusted before being carried out to any output devi....
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The circuit was designed to produce a 500mW output power transmitter whose signal modulated by FM using four transistors. Transmitter an electronic devi....
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The circuit was designed to create ten different frequency bands to be handled by a single graphic equalizer to produce and maintain a predetermined area....
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The circuit was designed according to the RIAA implementation of Hi-Fi phono preamplifier for the purpose of reproducing an audio from a moving magnet car....
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The circuit was designed to create a portable and sensitive regenerative receiver that will be suitable for shortwave band listening. Shortwave (SW) a t....
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Most multimeters today have an auto turn-off feature built in. There is enough space in a multimeter enclosure so why not to install a simple circuit that....
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This project aims to build an IR interval timer which can be used to capture images such as time lapse movies of sunrise or sunrise and the night sky. The....
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The circuit was designed to create a line preamplifier by acquiring the use of double triode tubes. The circuit comprises of three parts, the main preampl....
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The circuit was created to produce an oscillator operating at low frequency for use in the production of electronic music and experimenting and testing to....
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The circuit diagram was designed to create a power supply without utilizing any transformer circuit. This circuit illustrates the advantages as well as th....
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Equalizer a passive or an active electronic element or circuits (like tone control) used for the reason of altering or flattening the frequency response characteristics of a system NE5532 an internally compensated low noise dual operational amplifier with....
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Parts List The circuit consists of preamplifier, tone controls, and regulated DC power supply, while providing a power output of 18 Watts for 8 Ohm load a....
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This mini metronome gives a linear scaled output and 40 to 208 beats per minute. 1- Q1 and Q2 transistors provide linear frequency variation of IC1 depend....
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The circuit was designed to create an audio mixer that can be assembled in modules while providing 6 or more input channels. Audio Mixer a device used t....
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The circuit was designed to create a modular Class A buffer preamplifier in order to isolate stages in an audio circuit. BF245 a general purpose N-Chann....
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The circuit diagram shows a regular charger being powered by an AC input source, intended for charging batteries. This type of rechargeable batteries are....
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The circuit was designed based on the functionality of an op-amp to create a Wien bridge oscillator to generate sine waves in the frequency range of 15 Hz....
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The circuit exemplifies the use of ZN414 IC to produce a handy AM radio receiver. ZN414 IC a composition of transistor tuned radio frequency (TRF) circui....
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The circuit design employs a VHF amplifier adjusted in such a way that it will operate in the frequency range of 88 to 108 MHz, as part of the Band 2 Radi....
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This is a PIN diode based RF signal attenuator circuit operates with 1MHz 500MHz input. PIN diodes are one of the most common parts used in RF applicati....
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The circuit has been designed for telephone apparatus to indicate an incoming call as it rings using an LED for visual indication. BC550 an NPN general....
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The circuit was designed to create a lamp that incorporates the operation of a touch dimmer using S566B integrated circuit manufactured by Siemens. S566B....
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A “Cell Jammer†is just way of saying “Dirty Transmitter†which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better. T....
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This simple circuit is a line-level audio signal muting switch based on a soft-action power on/off process. When the S1 switch is closed, R4, C1 and Q4 JF....
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The circuit was designed to provide 2 channels on a stereo mixer that will be used for microphones while having a crossfader operation. NE5532 an intern....
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The three circuits were based on the vacuum tube ECC83 designed to produce phono preamplifiers in compliance with the RIAA standards. Recording Industry A....
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Parts List The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system ..
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The design of the circuit is aimed to create a preamplifier for television systems that would operate in the UHF frequency range of 450 MHz to 800 MHz and....
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The circuit drawn pertains to a regular industrial UPS (Uninterruptible Power Supply), which shows how the batteries take control during an outage in elec....
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The circuit was designed for the purpose of increasing an input signal of 4 Watts to 6 Watts operating on the VHF radio frequency band specifically the FM....
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The circuit was designed to operate a frequency modulation voice transmitter over the FM band 2 frequency range of VHF. Transmitter an electronic device....
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Today we are going to explain about a simple circuit which is used to switch on/off any electrical device remotely through a relay using the normal TV/VCR....
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Most of my Blog posts involve short 3-4 hour projects/hacks that I just build up for learning and fun. I thought it was time to develop something a bit mo....
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The easy way to power your projects Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, a....
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Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load....
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The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four dio....
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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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A dimmer is quite unusual in a caravan or on a boat. Here we describe how you can make one. So if you would like to be able to adjust the mood when you re....
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Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating....
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A 12V 20W halogen lamp (MR16) and a 4. 2Ah SLA battery for my bike light system. The battery has only limited life at this power rating, so I designed this cheap light dimmer to reduce the battery drain and allow for longer rides at night. Based on a simple....
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This 12V power inverter circuit can be used to power small power devices that need a 240 volts. It is very useful when you want to use a 240 volts consume....
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This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two “1 of 8 line decoders“74HC138 or 74HCT138) to generate the popular Nigh....
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High Quality very simple unit, No need for a preamplifier Amplifier parts: P1 = 22K R1 = 1K R2 = 4K7 R3 = 100R R4 = 4K7 R5 = 82K R6 = 10R-1/2W R7 = 22R R8....
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The TDA8581 from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8 ohm l....
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This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward v....
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22W into 4 Ohm power amplifier, Variable Low Pass Frequency: 70 150Hz This unit is intended to be connected to an existing car stereo amplifier, adding....
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Here is the 22 watt stereo audio power amplifier circuit diagram based on TDA1554 and integrated circuit from NXP semiconductors (formerly PHILIPS semicon....
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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. When I....
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This is A 8 bit Up/Down Counter that together with the “8 Bit Binary to 256 Decimal (1 of 256) Decoder “ makes a Run Light. I tried to to put all the 256....