NE555 Monostable

This is a monostable mode circuit of NE555 IC timer. Feature : timing period is 1.1msec, precision, Simple circuitry, independent output duration, 12V supply. Component : Resistor, capacitor, NE555 timer IC. [zen22142.zen.co.uk]

Basic 555 Squarewave Oscillator

The following circuit is a Basic 555 squarewave oscillator. Feature : 1 Khz tone, Simple circuitry, limit = 200 mA, inductive voltage reduced, 4.5-9 Supply voltage. Component : 555 timer IC, resistor, capacitor, Speaker, 2N3053 transistor, push button. [qsl.net]

Bicycle back Safety Light

This is a circuit of bicycle back safety light. Feature : 13 LEDs flashing, 3V supply voltage, Simple circuitry, low voltage, high efficiency, battery powered. Component : Resistor, capacitor, LED, switch, battery, 7555 timer IC. [redcircuits.com]

Four-Hour Timer

The following schematic diagram is four hour timer circuit. Feature : easy to build, 3 hours 53 minutes total time,9V supply voltage. Component : 555 timer IC, Resistor, capacitor, switch, transformer, LED, CD4040B, Relay, BC547 transistor, 1N418 diode, variable resistor. [wiredworld.tripod.com]

DS1621 PC Thermometer Circuit

The following circuit is PC thermometer using DS1621. Feature : plug in any free PC com port, range of -20 to 125°C, Centigrade (°C) of Farenheit (°F) scale, basic accuracy and resolution 0.5°C, readable data log, sampling rate 1, 5, 30 or 60 seconds, basic accuracy and resolution 0.5°C, no external power supply required, easy to build, no calibration required. Component : 1N418 diode, Capacitor, LM2936Z, regulator, DB9 female, Zener diode, DS1621. [riccibitti.com]

CPU Clock Display Circuit

This is a CPU clock display circuit. This circuit shows the CPU speed. Feature : Simple circuitry, easy to build, 5V supply, can display CPU clock. Component : 7 Segment display, Resistor, 1N4001 diode, jumper. [turbokeu.com]

Isolated Full Duplex RS232C Interface Circuit

This is a Isolated Full Duplex RS232C Interface circuit. This circuit is used to protect PC from direct connection to hazardous voltages. Feature : isolate TxD and RxD lines from the PC serial port , baud rate of 19.2k baud, 5V supply. Component : capacitor, 1N4148 diode, LED, DB9, terminal block resistor, 6N137, CNY17-3, 74HC14. [chaokhun.kmitl.ac.th]

Simple Temperature Regulated FAN Speed Controller Using MOSFET

The following circit is Simple temperature regulated FAN speed controller using MOSFET. Feature : + 12 V input voltage, 0-12 V output voltage, nice smooth regulation, noise removed, 47C max load, fan speed was about 3000 as usual.Component : capacitor, resistor, MOSFET P.[www.webx.dk]

Smart Battery Charger Using A Single-Transistor Circuit

The following circit is a smart battery charger using a single transistor. Featre : Simple circuitry, 13.3 VDC supply voltage, single transistor. Component : Battery, resistor, C1061 transistor, 1N4001 diode, relay, capacitor, potentiometer. [electronicdesign.com]

Single Transistor Nicad Battery Charger

This is a nicad battery charger circuit. Feature : Simple circuitry, charge nicad battery, changeable rate, single transistor, charging current 15mA or 45mA,for 1.5V and 9V battery, 12VAC supply voltage. Component : 1N4001 diode, Capacitor, 1N4148 diode, BD140 transistor, switch, resistor,transforme, Fuse.[zen22142.zen.co.uk]

NiCad Discharger for Rx & Tx Packs

This is a NiCad discharger circuit for Rx and Tx Packs. Feature : Simple circuitry, for NiCad battery, Tx battery 8 cell pack,Rx battery 4 cell pack. Component : LM3900 op amp, BD681, LED, resistorm capacitor,7805 voltage regulator, push button, BC548 transistor, Buzzer. [sentex.ca]

Lithium Chargers

This is a lithium charger circuit. Feature : variable current 100mA-2A, simple circuitry, easy to build, inexpensive circuitry, +12V supply voltage. Component : LM741, variable resistor, resistor, zener diode, capacitor, L200. [flyelectric.ukgateway.net]

Motorcycle Battery Charger

The following schematic diagram is a motorcycle battery charger. Feature : 115 or 220V Ac supply voltage, current of 3A, full indicator, simple circuitry, 14.1 volt output. Component : LM350, Transformer, bridge rectifier, capacitor, resistor, potentiometer, 1N4148 diode, BC558 transistor, 1N4001 diode, LED, LM1458. [sentex.ca]

14 Watts Audio Amplifier

The following circuit is a Audio amplifier which can give 14 watts of power. Feature : provide 14 watts of power, a discrete power op-amp, gain of approximately 150, preamp has voltage gain of 10, has extremely low distortion, relatively insensitive to the choice of components. Component : Capacitor, Resistor, potentiometer, CA3140, LM301, 1N751 Zener diodes, Speaker, 2N3904 transistor, 2N3906 transistor, TIP2955,1N4001 diode, Inductor,TIP3055.[michaelgellis.tripod.com]

100W Guitar Amplifier Using TL072

This is a guitar amplifier using TL072. This amplifier can amplify up to 100W. Feature : 100W amplification, Simple Circutry, Elegant design, provides excellent tonal range, suit any style of playing, provide a huge amount of gain. Component : Resistor, TL072, Capacitor, Potentiometer, BC549 transistor, Switch, Diode, Zener diodes.[sound.westhost.com]

2.5 W Stereo Class D Audio Power Amplifier Using LM4663

This circuit is a 2.5 W stereo class D audio power amplifier using LM4663. Feature : Two stereo input selector, Micropower shutdown mode, Stereo headphone amplifier, no heatsink needed, “Click and pop” suppression circuitry, Delta-sigma modulator, high efficiency, single supply. Component : resistor, capacitor, LM4663, speaker, headphone.[national.com]

Bench Amplifier

The following circuit is a bench amplifier. Feature : voltage gain of 200, 325mW of power, simple circuitry, work on 4 to 12Volts DC. Component : capacitor, resistor LM386, switch, variable resistor.[zen22142.zen.co.uk]

Balanced microphone preamp

The following circuit is a balanced microphone preamp. Feature : Simple circuitry, inexpensive, 60dB amplification, 12V supply voltage. Component : Resistor, transformer, potentiometer, ne5532, rectifier, 7812, 7912, fuse, capacitor, 7805, zener diode. [nomad.ee]

MPX4115 Barometric Pressures Circuit Diagram

Barometric Pressures Circuit Diagram

Description: The following circuit shows about MPX4115 Barometric Pressures Circuit Diagram. This circuit based on the MPX4115 IC. Features: bring the voltage down to the active range of 5 volt opamps, output is fed to the 1-Wire DS2438 A/D, available overall gain is about 12.6 (i.e. 0.68 * 2.16 * 8.58), opamp stage with a gain of U1A, capable of a gain range of 1/1 to about 8.58/1, 4.25 to 3.79 volts at sea level, 2.77 to 2.45 volts at 10,000 feet. Component: Resistor, IC, Capacitor, Variable Resistor.[davidbray.org]

Electrical Circuit Diagram Of 1-Wire Master/Slave Configuration

The following circuit shows about Electrical Circuit Diagram Of 1-Wire Master/Slave Configuration. This circuit uses a single data line plus ground reference. Features: Each 1-Wire slave device has a unique, controls the communication with one or more 1-Wire slave devices on the 1-Wire bus, 64-bit ID (identification number), unalterable, a serial protocol using a single data line plus ground reference for communication, factory-programmed. Component: 1 Wire Device, Interface Control, Device Function, Port Control, 1 Wire Host, Power Supply.[maxim-ic.com]