Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
New Circuits Page 14
SI Prog schematics
mcus for online ups
With the increasing daily reliance on networked data systems, the need for failsafe backup of power supply systems is now essential. Uninterruptible power supply (UPS) technology, with a very high level of reliability, are now extensively used to provide this backup security. Renesas produces MCUs and highly efficient power semiconductor devices (
Simple Alarm System
The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special devices and can be built using components that you will no doubt be able to find in the junk box. The alarm-triggering element is a simple reed switch. To generate the alarm signal itself any optical or acoust
Reading and writing Atmega168 EEPROM Tutorial
EEPROM (Electrically Erasable Programmable Read Only Memory) Is non-volatile memory, meaning it persists after power is removed. The ATmega168 microcontroller has 512 bytes of EEPROM which can be used to store system parameters and small amounts of data. This tutorial shows you how to read and write EEPROM. This counts how many times the device ha
i2c rtc interfacing with dspic primer
Before trying to understand a full bridge circuit, you may care to read up on PWM controllers, which page also describes how a half-bridge circuit works. Most full bridge motor controllers also use pwm! Designing a full-bridge PWM circuit that is reliable and `user-proof` is actually quite difficult! 4QD released our first such controller in 1992:
DTMF Proximity Detector
A DTMF-based IR transmitter and receiver pair can be used to realize a proximity detector. The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in front of the IR LED photo-detector pair up to a distance of about 12 cm from it. The circuit uses the commonly available telephony ICs such as dial-to
Pure Sine Wave Inverter Design With Code
2005 gmc h2 wiring diagram
Switch De-Bouncer Circuit
The 555 circuit can be re-triggered if the input is held low longer than the output pulse. To prevent this happening, I have included a further timing circuit comprised of the 1Meg resistor and 47n capacitor. Normally, the 47n capacitor is discharged via the 1 Meg resistor. When the switch is pressed the capacitor quickly charges and provides a br
The 4046 PPL is used as the heart of a tunable ultrasonic receiver that can be used to locate unheard ultrasonic sounds. The receiver might also be used, along with a simple ultrasonic generator, to send and receive Morse code. The incoming ultrasonic signal is picked up by piezo speaker SPKRl, and amplified by transistors Q1 and Q2. The output is
DUCATI HAYNES PDF
Ducati Haynes Pdf Manual PDF Download.
Tube tester collection
This is an experimental tube, that never made it. It was made by one of the Engineers of EI in Serbia, just out of interest. It was an idea of Mike Matthews from new sensor, and the tube was based on the PL519, and had indeed the characteristics of a 300B, and full 40 Watt. So it`s not the history of the 300B, but almost. The tube was to
Mains Supply Failure Alarm
Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark. The circuit is powered directly by a 9V PP3/6F22 compact battery. Pressing of switch S1 provides the 9V power supply to the circuit. A red LED (LED2), in conjunctio
big e stereo parabolic microphone
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 more realistic sounding audio. This is the figure of the circuit. The mini condenser microp
DIY Dual Fan Controller Project
Here`s a nice little circuit diagram for all those hardcore DIYers if you are trying to build a dual fan controller using an ATtiny45 although I`d never use this thing, I`d rather use a CUBLOC. Over the course of a weekend, I cobbled together some leftover robot parts to create a simple dual-fan controller. The board turns on the first fan when t
The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7 connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the supply and pin 2 detects this and turns off pin 7 to repeat the cycle. The scales on the graph are logarithmic so that 21k is approxi
Tube power amplifier 5W with EL84 circuit
Touch Dimmer Circuit for Lamps using TT6061 IC
A simple touch dimmer circuit diagram using TT6061 IC, which is a touch control integrated circuit used for Light dimmer circuit and lamp dimmer circuits..
555 Timer Frequency and Duty Cycle Calculator
First introduced by the Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits) Pin 1 (Ground) - The ground (or common) pin is the most-negative supply potential of the device, which is normally connected to circuit common when operated from positive supply voltages. Pin 2 (Trigg
16 Stage Bi-Directional LED Sequencer
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two â€œ1 of 8 line decodersâ€œ74HC138 or 74HCT138) to generate the popular Nigh..
Automobile White LED Light
Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficient white LED modules using the battery power available in automobiles. Here is a safe and simple white LED driver designed for 12V automobiles. In the Automobile White LED Light circuit, fixed voltage regulator IC1 (7805) provides a steady...
25 Watt Audio Amplifier Circuit
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 originally built this thing, it was because I needed a 25 Watt PC amp and did not want to sp
Voltage Level Detector Circuit
The design came from the interest of finding a new technique of analog to digital conversion. The two types of ADC (Analog to Digital Converter) that inspired me in the development of this circuit are Flash Type ADC and Successive Approximation Type ADC. The Flash Type ADC is the fastest ADC available in the market (highest sampling rate 120 Msps)
Crystal Radio Circuits
The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals. A "cat`s whisker" wire contact was moved about the surface of the crystal until a diode junction was formed. The 1N34A germanium diode is the modern substitute for galena and most other germanium small-signal diodes will also work well. Silicon diod
circuit and program to interface mt8870 with at89s51
Binu submitted a new resource: Circuit and Program to Interface MT8870 with AT89S51 (version 1.0) - Decoding the DTMF signals from the telephone line ..
Audio Amplifier 300x239 High Quality
32W Stereo Audio Amplifier
The Original 2 Phone Link Design
This is the circuit that sparked off all the other Link Telephone Intercom designs. Originally designed back in 1996 with heavy duty relays and their contact banks, it was updated late last year with the addition of IC1 in place of a simpler transistor multivibrator, the replacement of all relays and contact banks with optocouplers, and the additi
18 pin pic development board
Constant Current Battery Charger circuit
A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. Only one resistor is needed to set the desired charging current and is calculated by dividing the difference in battery voltages by the charge current..
Simple current limiting circuit
When the current is less than the value set, the bias current provided by R1 leads the P3 to be saturated to conduct. And it can not afford to control the current. When the current is greater than or equal to the set value, the pressure drop on R would increase and be close to the pressure drop of R2 after acrossing the transistor junction. Then i
Automatic Water Tank Filler Circuit
This circuit has been very useful in filling a header tank for a reticulated water supply on a farm. Eight troughs are supplied in different paddocks where a lack of water would have serious consequences for the stock. In the past, the tank had been filled daily by a time clock which was not successful. During hot weather, the stock would empty th
Electronic pests killing lamp circuit diagram 4
The electronic pests killing lamp circuit consists of the oscillator, control circuit, high voltage generator, LED indicating circuit and power supply circuit, and the circuit is shown as the chart. The oscillator circuit is composed of the time-base integrated circuit IC, resistors R5 ~ R7, diodes VD10, VD11 and capacitors C7, C8. Power supply...
Circuit Project: Small Audio Amplifiers Using LM386 and NE5534
About one Watt RMS seems to be a convenient size, and this is also about the highest power that a simple amplifier fed from 12V can put into an 8 Ohm speaker. A very low saturation amplifier may go as high up as 2 Watt, but any higher power requires the use of a higher voltage power supply, lower speaker impedance, a bridge circuit, or a...
avr parallel programmer 5
The chief advantage of this programmer is its ability to protect both the target and the PC from odd voltages when one side is powered off. The buffers are open-drain, and each is pulled up to the Vcc of the receiving party. The MC74LCX07 has an operating Vcc rating of 2. 0 to 5. 5V. In addition, this programmer is the only buffered programmer...
RESISTIVE-CAPACITIVE (RC) FEEDBACK OSCILLATOR
MAX641 high current step-up converter
Using MAX641 integrated circuit, manufactured by Maxim IC, can be designed a very simple step-up converter using few electronic components. This step-up high voltage converter electronic projects allows a maximum output current up to 1A. Low battery voltage detector input compare LB1 with internal reference of 1. 31 V. LBO output goes in low state
working principles of motor control
After dismantling chinese copy of segway I wanted to check how the controller is made. After a couple of hours of work with multimeter, pen, a sheet of paper and Kicad I came up with a block diagram and schematic of motor controller. This motor controller is made in a cheap and a very simple way. Reverse engineering and analysing this unit is a ve
10 to 1000 mhz oscillator
the design of the gas detector of LPC221
The gas detector designed this time is that have adopted the intelligence taking ARM microprocessor as the core to measure the control equipment, it not merely adopts the internationally advanced one-chip computer microprocessing of 1990s, also have the following characteristics: Adopt the appearance to use the amplifier, but automatic...
Simple Emergency Lamp
The circuit within the dotted line for a mini emergency light can be incorporated into any battery eliminator, provided the eliminator`s voltage is higher than the battery`s voltage. For greater load (1. e. for more light through a b1gger lamp), Tl should be a power transistor such as ADl49. Diode in the circuit prevents the flow of current from ba
Enhanced 4 Digit Alarm Keypad
The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7 terminals will NOT do. The Alarm is set by pressing a single key. Choose the key you want to use and wire it to `E`. Choose the four keys you want to use to switch the alarm off, and connect them
Turn A Compensated Current Sink Into A Common Emitter (CE) Amplifier
By adding only a few components, you can turn a temperature- and beta-compensated current sink into a common-emitter (CE) amplifier that maintains a stable biased operating point. This Idea for Design will show you how
Totem-Pole Output configuration found in ICs
A type of output structure used with integrated circuits in which one transistor drives the output high while another transistor connected below it pulls the output low. Many ICs use Totem-Pole Outputs, in fact it`s so common that the output structure isn`t mentioned in the data sheet title. An IC with a Totem-Pole Output is the
Opto-Coupled Discrete Pulse Stretcher
This is a pulse stretcher circuit using optocoupler. This circuit uses a 4N26 opto-coupler combined with a standard one-shot circuitry. This circuit is..
AVR Atmega16 Led blinking
DC Motor Controller and Tachometer
Controlling the speed of a motor is very important in many situations especially in robotics. There are many techniques of controlling the speed of motors, each with their advantages and disadvantages. This document will show you how to build a motor controller which controls the speed of a motor by varying the input voltage. Along the same lines,
arduino stepper motor control
LED VU meter circuit by transistor
The V.U. meter that works with the integrated amplifier circuit.The signal will sound, the audio amplifier circuit into VU meter circuit.And will show the level..
LED torch using NSI45090JDT4G constant current regulator
A very simple LED torch can be designed using the NSI45090JDT4G adjustable constant current regulator (CCR) designed by ON Semiconductor, using extreme few external components. NSI45090JDT4G device is designed to provide a cost effective solution for regulating current in LEDs. This Constant current regulator is based on patent-pending Self-Biase
The built-in ultrasonic flow measurement of stand pipe based on correlation method is designed (
In industrial production, flow measurement is to employ the extensive measurement physical quantity. Under special circumstances, when for instance vertical externally positioned installation probes of difficult pipeline such as the oil well, etc. , need to design a kind of instrument and equipment to test the flowrate to intraductal...
160 METER VFO
Standard Colpitts oscillator Q1 with emitter-follower Q2 gives dependability and adequate isolation from later stages Zener regulation provides stability even with weak battery Output is about 0. 7 VRMS. Low-level parasitic oscillation may occur about 150 kHz below operating frequency but is suppressed by tuned stages following VFO. L1 is 52 turns
68HC11 single chip microcomputer circuit diagram composed of intelligent temperature sensor
Advanced Simulation for ESD Protection Elements
Series of current pulses are imposed on the structure simulated, and average currents of the 70%~90% section of each curve are calculated, (b) Voltage vs. time curves are obtained from the simulation. And the average voltage of the 70%~90% section of each curve is calculated. Electrostatic discharge (ESD) failure is one of the most important...
fm transmitter circuit with max2606
FM transmitter circuit which is build using single chip of MAX2606. A very simple FM transmitter connects your home-entertainment system to a portable radio that will be carried surrounding the house and into the back yard. As an example, it is possible to play music on the CD player in your private room, and listen to it on a portable radio by th
battery desulfator circuit
Desulfation is the process of reversing the process of sulfation that occurs to a lead-acid battery over time. Desulfation restores, at least partially, the ability of the battery to hold a charge over the life of the battery originally caused by sulfation)..
There are a few situations when a power failure is particularly difficult to handle. Some of these circumstances occur in the bathroom. This little circuit will pay for itself many times over the first time it is used, especially if you are in the shower. This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2
solid state charger circuit
Mobile Vehicular Adapter
Here are two photos of the interior of the NSN6054A. The two metal brackets that hold the circuit board in place also function as heat sinks for the 12 watt audio amplifier.
Video Distributor Amplifier
Who Press First Educational Game
This electronics educational game uses a NAND IC, a Latch IC and a few peripheral components to construct a project that is able to tell who among the four person press the button first
8x8 dotmatrix scrolling led display
Here`s an another project, which makes an Scrolling LED display. Here 64 leds which are connected to an Matrix display. The Anodes are drived through an Driver IC UDN2981 and the cathodes are drived through ULN2803. The Atmega8515 is used in this project to control the display. The microcontroller is programmed with Bascom AVR. For example, look
PC based Robot Circuit
In order to create the circuitry below, you need a computer software that will control your parallel port. It will cost you about 30 US$. For example, a transistor (model number 2N2222) costs ~50, a DPDT relay, ~1. 75$ (this is maybe the most expensive piece, you need 7). This implementation uses IC-sockets to hold the pieces. That way, they are...
1000w audio power amplifier blazer circuit
SCR Mini Power Inverter
This be Mini Power Inverter , by use SCR be main part electronics , perform Oscillator Generator 400Hz give Output 300V by use Voltage Input 12V Current..
digital dip switch circuit diagram
CMOS Based VCA
Flip-Flop Using CMOS NAND Gates
Using just two NAND or inverter gates its possible to build a D type (or toggle`)‚ip-‚op with a push-button input. At power-up the output of gate N2 is at a logical 1`, ensuring that transistor T2 is switched off. When the push-button is pressed the output of N2 changes to a logical 0` and transistor T2 conducts. The coupling between N1 and N
USB Performance Monitor
The USB Performance monitor is a PIC18F2550 based device which shows the performance of your computer using two analogue meters and a RGB LED. The design is based around a stock Hi-Fi VU-meter which is controlled using PWM from the PIC18F microcontroller. This project was inspired by a friend of mine who wanted a way to move his computer`s HDD LED
Simple Power Supply circuit
IGNITION TIMING LIGHT
Figure A shows the circuit of a direct-trigger timing light. The trigger voltage is taken from the car`s ignition circuit by a direct connection to a spark plug. A circuit using an inductive pickup is shown in Fig. B. A trigger transformer is used to develop the high-voltage pulse for triggering. The triggering circuit consists of T1, C1, SCR1,...
Drum Solenoid Interface for Tap-Tempo Metronome
We added an external piezoelectric element to set on the bench top, making it easier for kids to reach. We simply soldered this external piezo element to the same pads as the Tap-Tempo Metronome`s built-in piezo element. Here`s the large piezo we used. For the drum striker, we used an electromagnetic solenoid, which consists of a coil of wire...
Band 2 Preamplifier
The circuit uses two 2N3819 FET`s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:
high gain antenna 43dB amplifier circuit
A very simple and useful antenna amplifier can be constructed using this circuit diagram. This antenna amplifier is very useful for 35kHz-150Mhz frequency band. This antenna amplifier circuit is based on transistors and has a low 3 dB non-linearity and a high gain of 43 dB. The input and output impedance for this rf amplifier is 75 ohms. The L
Homebuilt arc welder
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.
Switching Regulator Circuit
This example introduces the switch D. C. regulated power supply circuit of buck-mode +5V series. It is composed of power supply circuit, impulsator, voltage sampling or pulse width modulation circuit, buffering driver circuit and it is showed as the picture 5-38. The input converting circuit consists of mains transformer, T, commutation diode...
Linear-Circuits in U.H.F. Oscillators
The use of a quarter-wave parallel-wire line as a tuning unit has been discussed in the chapter on Short-Lines, where it was pointed out that these " circuits " have comparatively high Q even at the higher frequencies. Their great length ( »/4) prevents their widespread use at lower frequencies. But when the wave-length is only 1 meter or thereabo
solar panel based charger circuit
water level indicator circuit using cmos ics
A very simple low cost water level indicator circuit can be designed using this schematic circuit. This water level indicator is based on a simple CMOS IC CD4066 and indicates the amount of water present in the overhead tank and also gives an alarm when the tank is full. When the water is empty the wires in the tank are open circuited and the 180