New Circuits Page 154
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When deciding how to move the robot through the house, the designers realized that precision movement would be necessary in order to avoid touching the walls and receiving penalties. In order to achieve the required precision in movement, it was decided that....
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A simple ultrasonic range finder using 8051 microcontroller is presented in this article. This ultrasonic rangefinder can measure distances up to 2. 5 meters at an accuracy of 1 centi meter. AT89s51 microcontroller and the ultrasonic transducer module....
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NE5532DR absolute maximum ratings: (1)Supply voltage: VCC+ 22 V; VCC-: -22 V; (2)Input voltage, either input VCC ±; (3)Input current: ±10 mA; (4)Duration of output short circuit: Unlimited; (5)Package thermal impedance, JA: D package 97ƒ/W; P package 85ƒ/W;....
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Control a fan using an LM34 temp sensor and a computer fan with model number : ASB0912L. I used a 2N7000 mosfet transistor as a switch. I want my fan to run at 35% duty cyle when the temperature is above 77 fahrenheit and to run at 0% duty cycle when....
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The following circuit shows about 40 MHZ/400 MHZ Frequency Counter Circuit Diagram. This circuit based on the PIC16F84 IC. Features: with ....
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This device just sends data about the state of our office to Twitter (mainly because it`s just slightly more relevant than sending the same information about my house). It does however have potential relevance to more biodiversity themed activities,....
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Voltage output is controlled by 10K variable resistor. Output voltage range value will be about 3 to 15 volts, and current range is about 10mA minimum and 2 amp maximum. Reaching the current limit will reduce the output voltage to zero. Make a PCB in very....
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The picture to the left is a high quality radio transmitter for the A. M. broadcast band. The transmitter legally operates with "micro-power" and will not set any distance records but, unlike simpler designs, the frequency stays put and the fidelity is....
-
The power supply takes its power from a 24-volt VDC wall wart either via N1, an on board connector, or via N10 an off-board connector. The power switch is either mounted on board or off-board via connector N2. The fuse can either be on board at F1 or off....
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Colour Organ Videos Complete instructions this episode Weekend Projects can be found Fifteen years ago I bought a box from my uncle Here`s what it does....
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The light fader circuits presented here have a common idea of producing a “cool†switch ON and switch OFF effect on the connected lamps, i.e. every time these lights are switched; the outcome is gradual and not sudden, producing an interesting slow glow....
-
This 3V to 24 volt variable-regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be increased to 3....
-
Wiper Speed Control. A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds..
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An oscillator is an amplifier with a feedback loop from output to input. Barkhausen criteria states that for oscillation to occur the product of the gains around a loop must be equal to or greater than unity and that the sum of the phase shifts around the....
-
ASSP For Communication AN12979A AN12979A is the stereo BTL Amplifier which contained the AGC circuit for clip prevention of a speaker output. 2 This IC performs a mode change by the I C bus control system. (Standby function ON/OFF change etc. ) By Panasonic....
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This AC Power Monitor continuously watches the AC power line voltage for both under-voltage and missing cycles. When it detects a total of 5 or 6 consecuti....
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One of the first lessons that an electronics student learns is that an LED provides light from current flow. But, did you know that an LED put in backwards provides current flow from light Yes! It`s true. Hook up a high-quality ultra-bright red LED by itself....
-
What kind of microphone or mouthpiece I can use to connect across a pots telephone line in order to send dtmf tones ( no voice ) dtmf only. Can I use a regular mic or does it have to be a certain type, I am using a 300 ohm resistor to hold open the line....
-
-
Natural Radio" is simply radio noise with natural origins, mainly lightning, but also clouds of ions interacting with the earth`s magnetic field. Nearby lightning sounds like the familiar crackle heard on an ordinary AM radio but distant lightning produces....
-
IC4 is a counter/oscillator combination and is the key element in the circuit. The oscillator outputs its AC signal on pin 7. This signal is lead (through voltage divider R3/R4) to pin 3 of IC5 (multiplexer IC) which is used as an input. The same signal is....
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Low Voltage Differential Signaling (LVDS) interface is a digital video signal transmission vehicle of the most effective interface, it is to send digital audio data stream of low-cost program. This article describes how the use of Maxim Integrated Products....
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With the remote control at your fingertips, you are the only one to decide when and if the parachute should deploy. Ideally, in a very large open field, you can wait until after apogee to deploy the parachute. Depending on wind conditions, you can decide....
-
A basic circuit of the 89C2051 shown here can be made easily using point-to-point soldering with a universal PCB. Use an ordinary 20-pin socket, do not use a circle-pin socket. D1 is a small dot LED. U2 can be either 7805 or 78L05. U3 is optional for....
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Anyone know how I could make an led come on when it gets dark automatically?I made a version with a relay and photoresistor that worked but then I was think won`t that drain the battery to much?I`m trying to use this in conjunction with a circuit I got from....
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A 6 watt audio amplifier circuit using TDA2613 is shown here. TDA2613 is an integrated Hi-Fi audio amplifier IC from Philips Semiconductors. The IC is switch ON / switch OFF click proof, short circuit proof, thermally protected and is available in 9 pin....
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As we presented in another article the A3952S integrated circuit ( designed by Allegro MicroSystems ) can be used to design very simple and useful motor driver circuits. In the precedent article was presented a simple bipolar stepper motor driver circuit....
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When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The....
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Capacitance Meter Circuit Using 555 It directly reads capacitance in the range 100pF to 10µF. IC1 and IC2 operate as an astable (with frequency....
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This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous, unidirectional loop sequence. The circuit uses the 74LSxx family of TTL integrated logic devices. The circuits are designed to drive light....
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This circuit is not fun to look at nor is it fun to implement, it takes a bit of effort. Since there are two coils in our stepper motor we`ll use two LMD18245`s to control the current flow through the coils. It is important to note that there are motor....
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This slideshow is based on the LEDs Design Ideas Collection, a collection of LED-related reader submitted circuits and design applications that have appeared in EDN`s `Design Ideas` section. Here you can browse through the circuit schematics in that....
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You most likely know that LM317 IC is applied as an practical provide regulator, but did you know it can be applied as an audio amplifier This is a Low power Amplifier LM317 Simple Audio Amplifier Circuit a audio designed with LM317 that offers a optimum....
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The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these. To use the circuit, hook it up to a power supply/plug it in. Then,....
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Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit`s transmitter IC is controlled by NE555. Receiver circuit works by the signal emitted frequency....
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It should at least detect 230 VAC but it would be cool/informative for future readers if the solution could work in US and EU (approximately 120 VAC to 250 VAC). I did find this (non-isolated!) circuit, but I can not get it to simulate (the simulator....
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The diacs, because of their symmetrical bidirectional switching characteristics, are widely used as triggering devices in triac phase control circuits em ployed for lamp dimmer, heat control, universal motor speed control etc. Although a triac may be fired....
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Tone control circuit using opamp and a baxendall passive tone control circuit. Overall gain is 25db with 20db boost & cut. Powered using 15V dual supply....
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-
Most off-the-shelf car battery chargers cannot not be left connected to the battery for long periods of time as over-charging and consequent battery damage will occur. This add-on circuit is placed in series with the battery being charged and is powered by....
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The circuit decreases the size voltage or Stepdown Voltage converter circuit be dc regulated circuit model switching converter. The that make voltage output....
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Pulses are received by the timer from the distributor points. When the timer output is high, Meter M receives a calibrated current through R6. The meter don`t....
-
The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here....
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This application note explains the operation of the data slicers found in the Maxim line of UHF receivers like the MAX1470, MAX1473, and MAX1471 and transceivers like the MAX7030 and MAX7032....
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Provides at leaet 200 kc deviation when applied to base of oscillator transistor, before severe distortion sets in. feedback keeps output impedance low. -D. Enemark, Transistors Improve Telemeter Transmitter, Electronics, 32:11, p 136-137. ..
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In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the....
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This bulletin outlines applications, design features, equipment arrangement, and space planning, for the type 230 controllers. These controllers are for the control and protection of induction motors or transformers on 2300-4160-volt systems. Each type 230....
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When wired to a ten-digit keypad, the circuit will recognize one 4 digit combination out of a possible 5040 codes. When the programmed four-digit combination is entered from the keypad, in proper sequence, LOCK turns on and Lock Status turns off. The lock....
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The +/- 3 dB point for the treble is about 2, 5 KHz, with about 12 dB boost/cut at 10 KHz. Perhaps you should check the wiring (again ) or perhaps componentvalues Do you have access to a signal generator yeah i checked wiring and components again and again,....
-
-
Here is a really simple game show timer designed with the beginner in mind! The power source is an ordinary 12 volt lantern battery or battery pack made up of C or D cells. The lamps may be ordinary flashlight bulbs; the prototype uses 750 mA Krypton types....
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This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1. ..
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About a do-it-yourself alarm arrangement body with PIC18F452. It`s a abundant amusement activity although the schematic is actual complicated. This activity uses three capital accessories to actualize the claimed alarm system. The IR Ambit sensor gives....
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The schematic for this tutorial can be seen drawn out below. It includes everything you`d need to wire up for the tutorial to work. PIC programming circuitry is not included in the schematic as I`m assuming either you`re programming the PIC out of circuit or....
-
The Supertex HV7370 is a four-channel, high speed, high voltage, ultrasound transmitter damper, and the HV748 is a four-channel, high speed, high voltage ultrasound transmitter pulser. Both integrated circuits (ICs) are designed for medical ultrasound....
-
Both used a pair of capsules from Neumann`s K67 family, mounted one atop another, with the top capsule having the ability to be rotated 270 ° against the bottom (presumably, -90 ° +180 ° like the USM 69). The capsule is Neumann`s K870, a 34mm design with....
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The 82C55 and 7 segment decoders on the display board will be changed to a group of shift registers on the display board, so that the 82C55 and the large number of wires won`t be needed. The ADC0804 will be replaced with a serial interface ADC chip, and the....
-
This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition, Exchange will detect it & send ringing pulse to other phone. When it will be picked....
-
Transistor is a semiconductor device used for switching and amplification of weak signals. This article explains how a transistor work and the working of transistor as a switch. At present, transistors are applied in most of the electronic equipments for....
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An embedded C based RF controlled robot with metal detector and wireless image and voice transmission. Robotics project report for ece students with report..
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There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect the Lilypad Arduino using the FTDI at the same time. The....
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I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating...
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This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. Th...
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This is the circuit diagram of a 3 LED bar graph type battery monitor circuit that is ideal for monitoring the voltage level of an automobile battery. When battery voltage is 11. 5V or less transistor Q1 will be On and the LED D1 will be glowing. When....
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This is the 555 Sawtooth Oscillator circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the 555 Sawtooth Oscillator circuit and to simulate it online for better understanding....
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This audio mixer circuit diagram electronic project is designed using few common electronic components. This audio mixer circuit project has two input channels. The input signal can be independently controlled using the R1 and R2 variable resistors. The R3....
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The circuit uses two LDRs which are placed one after another (separated by a distance of say half a metre) so that they may separately sense a person going into the room or coming out of the room. Outputs of the two LDR sensors, after processing, are used in....
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This could be the circuit diagram of a easy electronic combination lock by using IC LS 7220. This circuit may be applied to activate a relay for controlling (on & off) any device each time a preset combination of 4 digits are pressed. The circuit may be....
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U1 is the 3817 integrated circuit. It has the ability to drive the display directly, and it can display 12h or 24h, schedule alarm sounds, timely and automatically turn on the radio. Display is FND500 light-emitting diode, the input frequency is 50H or 60Hz.....
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Because the two amps are the same except for their power sections, we can combine both those questions so that each one helps to explain the other. And when you get a chance to audition the two amplifiers, you`ll be treated to a demonstration of the musical....
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A series of LEDs I would like to have display at 2 brightness levels and am confused how to properly wire this. This is for additional running lights/brake lights on my bike. When using the series LED calculator I believe for the Source voltage 1 I should....
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A form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other. Basically two amplifiers cross-coupled with regenerative feedback, in it`s most simplistic form. One of the....
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The following circuit shows about 3V Power Supply For RF Remote Control Circuit. This circuit Based On the AT90S2323 IC. Features: 2400bps ....
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Using the new VIPer12A and VIPer22A software To supply the large number of electronics components required for home appliances, different power supply topologies can be used. We....
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The output F1 pin 17 of the PLA U17 goes "low" when the BASIC ROM is selected. The KERNAL ROM resides at locations $E000 - $FFFF. The output F2 pin 16 of the PLA U17 goes "low" when the KERNAL ROM is selected. The CHARACTER GENERATOR ROM resides at locations....
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SK1901 is a semiconductor integrated circuit utilizing the Hall effect. It has been so designed as to operate in the alternating magnetic field especially at low supply voltage and operation over extended temperature ranges to +125. This Hall IC is suitable....
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This is the simple design and sensitivity and selectivity of the receiver are good. This circuit is use a compact three transistor, regenerative receiver with fixed feedback. The circuit is based on transistor as core of the operation. The transistor that is....
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This circuit shows about LM319 IC For Thermostat Circuit Diagram. Features: 2 watt potentiometer for triac power control, 10 Meg resistance ....
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The circuit of the running light comprises two integrated circuits (ICs), a resistor, a capacitor and seven light-emitting diodes (LEDs), Decade scaler IC....
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There are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/high indicator is desirable. A battery charge level indicator in a car is a good example. This simple circuit requiring....
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If you wish to use a double power supply but don`t have a center trapped transformer you can use an electronic circuit in the following configuration. This electronic circuit uses a second rectifier bridge coupled with secondary coil of the transformer using....
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Speed-limit Alert Wireless portable unit Adaptable with most internal combustion engine vehicles Circuit diagram Parts: R1,R2,R19 1K 1/4W Resistors R3-R6,R13,R17 100K 1/4W Resistors R7,R15 1M 1/4W Resistors R8 50K 1/2W Trimmer Cermet R9 470....
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This is very simple charger 9V - 30V battery charger with main operation by IC LM317L and 2N222 transistor. Direct input DC voltage, the recomended capacitor is 1000uf. It can be filtering Output voltage and make long-lasting battery. And easy to make this....
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Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-core cables to the mains plug. Due to prolonged usage, the power cord wires are subjected to mechanical....
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Designing A Li Ion Battery Charger with Load Sharing MCP73837 Batteries often serve as the main energy source for portable electronic devices. Although they depend on batteries, portable consumer electronic products, such as GPS devices and multi-media....
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A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old russian radio (2x280pF). I read on the Internet that if you live in an area with strong signals and you want to....
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When deciding how to move the robot through the house, the designers realized that precision movement would be necessary in order to avoid touching the walls and receiving penalties. In order to achieve the required precision in movement, it was decided that....
A simple ultrasonic range finder using 8051 microcontroller is presented in this article. This ultrasonic rangefinder can measure distances up to 2. 5 meters at an accuracy of 1 centi meter. AT89s51 microcontroller and the ultrasonic transducer module....
NE5532DR absolute maximum ratings: (1)Supply voltage: VCC+ 22 V; VCC-: -22 V; (2)Input voltage, either input VCC ±; (3)Input current: ±10 mA; (4)Duration of output short circuit: Unlimited; (5)Package thermal impedance, JA: D package 97ƒ/W; P package 85ƒ/W;....
Control a fan using an LM34 temp sensor and a computer fan with model number : ASB0912L. I used a 2N7000 mosfet transistor as a switch. I want my fan to run at 35% duty cyle when the temperature is above 77 fahrenheit and to run at 0% duty cycle when....
The following circuit shows about 40 MHZ/400 MHZ Frequency Counter Circuit Diagram. This circuit based on the PIC16F84 IC. Features: with ....
This device just sends data about the state of our office to Twitter (mainly because it`s just slightly more relevant than sending the same information about my house). It does however have potential relevance to more biodiversity themed activities,....
Voltage output is controlled by 10K variable resistor. Output voltage range value will be about 3 to 15 volts, and current range is about 10mA minimum and 2 amp maximum. Reaching the current limit will reduce the output voltage to zero. Make a PCB in very....
The picture to the left is a high quality radio transmitter for the A. M. broadcast band. The transmitter legally operates with "micro-power" and will not set any distance records but, unlike simpler designs, the frequency stays put and the fidelity is....
The power supply takes its power from a 24-volt VDC wall wart either via N1, an on board connector, or via N10 an off-board connector. The power switch is either mounted on board or off-board via connector N2. The fuse can either be on board at F1 or off....
Colour Organ Videos Complete instructions this episode Weekend Projects can be found Fifteen years ago I bought a box from my uncle Here`s what it does....
The light fader circuits presented here have a common idea of producing a “cool†switch ON and switch OFF effect on the connected lamps, i.e. every time these lights are switched; the outcome is gradual and not sudden, producing an interesting slow glow....
This 3V to 24 volt variable-regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be increased to 3....
Wiper Speed Control. A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds..
An oscillator is an amplifier with a feedback loop from output to input. Barkhausen criteria states that for oscillation to occur the product of the gains around a loop must be equal to or greater than unity and that the sum of the phase shifts around the....
ASSP For Communication AN12979A AN12979A is the stereo BTL Amplifier which contained the AGC circuit for clip prevention of a speaker output. 2 This IC performs a mode change by the I C bus control system. (Standby function ON/OFF change etc. ) By Panasonic....
This AC Power Monitor continuously watches the AC power line voltage for both under-voltage and missing cycles. When it detects a total of 5 or 6 consecuti....
One of the first lessons that an electronics student learns is that an LED provides light from current flow. But, did you know that an LED put in backwards provides current flow from light Yes! It`s true. Hook up a high-quality ultra-bright red LED by itself....
What kind of microphone or mouthpiece I can use to connect across a pots telephone line in order to send dtmf tones ( no voice ) dtmf only. Can I use a regular mic or does it have to be a certain type, I am using a 300 ohm resistor to hold open the line....
Natural Radio" is simply radio noise with natural origins, mainly lightning, but also clouds of ions interacting with the earth`s magnetic field. Nearby lightning sounds like the familiar crackle heard on an ordinary AM radio but distant lightning produces....
IC4 is a counter/oscillator combination and is the key element in the circuit. The oscillator outputs its AC signal on pin 7. This signal is lead (through voltage divider R3/R4) to pin 3 of IC5 (multiplexer IC) which is used as an input. The same signal is....
Low Voltage Differential Signaling (LVDS) interface is a digital video signal transmission vehicle of the most effective interface, it is to send digital audio data stream of low-cost program. This article describes how the use of Maxim Integrated Products....
With the remote control at your fingertips, you are the only one to decide when and if the parachute should deploy. Ideally, in a very large open field, you can wait until after apogee to deploy the parachute. Depending on wind conditions, you can decide....
A basic circuit of the 89C2051 shown here can be made easily using point-to-point soldering with a universal PCB. Use an ordinary 20-pin socket, do not use a circle-pin socket. D1 is a small dot LED. U2 can be either 7805 or 78L05. U3 is optional for....
Anyone know how I could make an led come on when it gets dark automatically?I made a version with a relay and photoresistor that worked but then I was think won`t that drain the battery to much?I`m trying to use this in conjunction with a circuit I got from....
A 6 watt audio amplifier circuit using TDA2613 is shown here. TDA2613 is an integrated Hi-Fi audio amplifier IC from Philips Semiconductors. The IC is switch ON / switch OFF click proof, short circuit proof, thermally protected and is available in 9 pin....
As we presented in another article the A3952S integrated circuit ( designed by Allegro MicroSystems ) can be used to design very simple and useful motor driver circuits. In the precedent article was presented a simple bipolar stepper motor driver circuit....
When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The....
Capacitance Meter Circuit Using 555 It directly reads capacitance in the range 100pF to 10µF. IC1 and IC2 operate as an astable (with frequency....
This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous, unidirectional loop sequence. The circuit uses the 74LSxx family of TTL integrated logic devices. The circuits are designed to drive light....
This circuit is not fun to look at nor is it fun to implement, it takes a bit of effort. Since there are two coils in our stepper motor we`ll use two LMD18245`s to control the current flow through the coils. It is important to note that there are motor....
This slideshow is based on the LEDs Design Ideas Collection, a collection of LED-related reader submitted circuits and design applications that have appeared in EDN`s `Design Ideas` section. Here you can browse through the circuit schematics in that....
You most likely know that LM317 IC is applied as an practical provide regulator, but did you know it can be applied as an audio amplifier This is a Low power Amplifier LM317 Simple Audio Amplifier Circuit a audio designed with LM317 that offers a optimum....
The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these. To use the circuit, hook it up to a power supply/plug it in. Then,....
Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit`s transmitter IC is controlled by NE555. Receiver circuit works by the signal emitted frequency....
It should at least detect 230 VAC but it would be cool/informative for future readers if the solution could work in US and EU (approximately 120 VAC to 250 VAC). I did find this (non-isolated!) circuit, but I can not get it to simulate (the simulator....
The diacs, because of their symmetrical bidirectional switching characteristics, are widely used as triggering devices in triac phase control circuits em ployed for lamp dimmer, heat control, universal motor speed control etc. Although a triac may be fired....
Tone control circuit using opamp and a baxendall passive tone control circuit. Overall gain is 25db with 20db boost & cut. Powered using 15V dual supply....
Most off-the-shelf car battery chargers cannot not be left connected to the battery for long periods of time as over-charging and consequent battery damage will occur. This add-on circuit is placed in series with the battery being charged and is powered by....
The circuit decreases the size voltage or Stepdown Voltage converter circuit be dc regulated circuit model switching converter. The that make voltage output....
Pulses are received by the timer from the distributor points. When the timer output is high, Meter M receives a calibrated current through R6. The meter don`t....
The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here....
This application note explains the operation of the data slicers found in the Maxim line of UHF receivers like the MAX1470, MAX1473, and MAX1471 and transceivers like the MAX7030 and MAX7032....
Provides at leaet 200 kc deviation when applied to base of oscillator transistor, before severe distortion sets in. feedback keeps output impedance low. -D. Enemark, Transistors Improve Telemeter Transmitter, Electronics, 32:11, p 136-137. ..
In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the....
This bulletin outlines applications, design features, equipment arrangement, and space planning, for the type 230 controllers. These controllers are for the control and protection of induction motors or transformers on 2300-4160-volt systems. Each type 230....
When wired to a ten-digit keypad, the circuit will recognize one 4 digit combination out of a possible 5040 codes. When the programmed four-digit combination is entered from the keypad, in proper sequence, LOCK turns on and Lock Status turns off. The lock....
The +/- 3 dB point for the treble is about 2, 5 KHz, with about 12 dB boost/cut at 10 KHz. Perhaps you should check the wiring (again ) or perhaps componentvalues Do you have access to a signal generator yeah i checked wiring and components again and again,....
Here is a really simple game show timer designed with the beginner in mind! The power source is an ordinary 12 volt lantern battery or battery pack made up of C or D cells. The lamps may be ordinary flashlight bulbs; the prototype uses 750 mA Krypton types....
This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1. ..
About a do-it-yourself alarm arrangement body with PIC18F452. It`s a abundant amusement activity although the schematic is actual complicated. This activity uses three capital accessories to actualize the claimed alarm system. The IR Ambit sensor gives....
The schematic for this tutorial can be seen drawn out below. It includes everything you`d need to wire up for the tutorial to work. PIC programming circuitry is not included in the schematic as I`m assuming either you`re programming the PIC out of circuit or....
The Supertex HV7370 is a four-channel, high speed, high voltage, ultrasound transmitter damper, and the HV748 is a four-channel, high speed, high voltage ultrasound transmitter pulser. Both integrated circuits (ICs) are designed for medical ultrasound....
Both used a pair of capsules from Neumann`s K67 family, mounted one atop another, with the top capsule having the ability to be rotated 270 ° against the bottom (presumably, -90 ° +180 ° like the USM 69). The capsule is Neumann`s K870, a 34mm design with....
The 82C55 and 7 segment decoders on the display board will be changed to a group of shift registers on the display board, so that the 82C55 and the large number of wires won`t be needed. The ADC0804 will be replaced with a serial interface ADC chip, and the....
This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition, Exchange will detect it & send ringing pulse to other phone. When it will be picked....
Transistor is a semiconductor device used for switching and amplification of weak signals. This article explains how a transistor work and the working of transistor as a switch. At present, transistors are applied in most of the electronic equipments for....
An embedded C based RF controlled robot with metal detector and wireless image and voice transmission. Robotics project report for ece students with report..
There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect the Lilypad Arduino using the FTDI at the same time. The....
I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating...
This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. Th...
This is the circuit diagram of a 3 LED bar graph type battery monitor circuit that is ideal for monitoring the voltage level of an automobile battery. When battery voltage is 11. 5V or less transistor Q1 will be On and the LED D1 will be glowing. When....
This is the 555 Sawtooth Oscillator circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the 555 Sawtooth Oscillator circuit and to simulate it online for better understanding....
This audio mixer circuit diagram electronic project is designed using few common electronic components. This audio mixer circuit project has two input channels. The input signal can be independently controlled using the R1 and R2 variable resistors. The R3....
The circuit uses two LDRs which are placed one after another (separated by a distance of say half a metre) so that they may separately sense a person going into the room or coming out of the room. Outputs of the two LDR sensors, after processing, are used in....
This could be the circuit diagram of a easy electronic combination lock by using IC LS 7220. This circuit may be applied to activate a relay for controlling (on & off) any device each time a preset combination of 4 digits are pressed. The circuit may be....
U1 is the 3817 integrated circuit. It has the ability to drive the display directly, and it can display 12h or 24h, schedule alarm sounds, timely and automatically turn on the radio. Display is FND500 light-emitting diode, the input frequency is 50H or 60Hz.....
Because the two amps are the same except for their power sections, we can combine both those questions so that each one helps to explain the other. And when you get a chance to audition the two amplifiers, you`ll be treated to a demonstration of the musical....
A series of LEDs I would like to have display at 2 brightness levels and am confused how to properly wire this. This is for additional running lights/brake lights on my bike. When using the series LED calculator I believe for the Source voltage 1 I should....
A form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other. Basically two amplifiers cross-coupled with regenerative feedback, in it`s most simplistic form. One of the....
The following circuit shows about 3V Power Supply For RF Remote Control Circuit. This circuit Based On the AT90S2323 IC. Features: 2400bps ....
Using the new VIPer12A and VIPer22A software To supply the large number of electronics components required for home appliances, different power supply topologies can be used. We....
The output F1 pin 17 of the PLA U17 goes "low" when the BASIC ROM is selected. The KERNAL ROM resides at locations $E000 - $FFFF. The output F2 pin 16 of the PLA U17 goes "low" when the KERNAL ROM is selected. The CHARACTER GENERATOR ROM resides at locations....
SK1901 is a semiconductor integrated circuit utilizing the Hall effect. It has been so designed as to operate in the alternating magnetic field especially at low supply voltage and operation over extended temperature ranges to +125. This Hall IC is suitable....
This is the simple design and sensitivity and selectivity of the receiver are good. This circuit is use a compact three transistor, regenerative receiver with fixed feedback. The circuit is based on transistor as core of the operation. The transistor that is....
This circuit shows about LM319 IC For Thermostat Circuit Diagram. Features: 2 watt potentiometer for triac power control, 10 Meg resistance ....
The circuit of the running light comprises two integrated circuits (ICs), a resistor, a capacitor and seven light-emitting diodes (LEDs), Decade scaler IC....
There are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/high indicator is desirable. A battery charge level indicator in a car is a good example. This simple circuit requiring....
If you wish to use a double power supply but don`t have a center trapped transformer you can use an electronic circuit in the following configuration. This electronic circuit uses a second rectifier bridge coupled with secondary coil of the transformer using....
Speed-limit Alert Wireless portable unit Adaptable with most internal combustion engine vehicles Circuit diagram Parts: R1,R2,R19 1K 1/4W Resistors R3-R6,R13,R17 100K 1/4W Resistors R7,R15 1M 1/4W Resistors R8 50K 1/2W Trimmer Cermet R9 470....
This is very simple charger 9V - 30V battery charger with main operation by IC LM317L and 2N222 transistor. Direct input DC voltage, the recomended capacitor is 1000uf. It can be filtering Output voltage and make long-lasting battery. And easy to make this....
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-core cables to the mains plug. Due to prolonged usage, the power cord wires are subjected to mechanical....
Designing A Li Ion Battery Charger with Load Sharing MCP73837 Batteries often serve as the main energy source for portable electronic devices. Although they depend on batteries, portable consumer electronic products, such as GPS devices and multi-media....
A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old russian radio (2x280pF). I read on the Internet that if you live in an area with strong signals and you want to....
