Position: Index > Unclassified >
  • How to build Decibel Meter

    2018-11-13 15:12:4660

    Description The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a tran...

  • How to build Low Voltage, High Current Time Delay Circuit

    2018-11-13 14:44:1060

    Description In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approxim...

  • Sound Level Indicator Circuit

    2018-11-13 13:59:3462

    Sound Level Indicator Circuit This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it ...

  • Wart Zapper

    2018-11-13 13:33:1961

    Wart Zapper A Recent History By now, theWart Zapperhas quite a history behind it. Three different embodiments have been published in three major magazi...

  • USB to Serial RS232 adapter circuit design electronic projec

    2018-11-13 12:43:4962

    Various circuits design This USB to Serial RS232 adapter is very useful in many situations we need to connect a device with RS232 to a computer without...

  • How to build Triangle and Squarewave Generator

    2018-11-13 12:42:2460

    Description Here is a simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very low frequencies to about 10 Khz. ...

  • How to build Multitasking Pins

    2018-11-13 10:24:0460

    Circuit diagram: Description It’s entirely logical that low-cost miniature microcontrollers have fewer ‘legs’ than their bigger brothers and sist...

  • How to build Frequency Divider

    2018-11-13 10:17:1761

    Description This is a classic divider of frequency via two. It is achieved with a classic circuit T-flipFlop, round IC1 [ 4011 ]. In the circuit, the f...

  • Shortwave radio receiver circuit project

    2018-11-13 10:13:5060

    Radio Circuits A very simple shortwave radio receiver circuit can be designed using circuit diagram bellow . This shortwave radio receiver is based on ...

  • How to build Repeating Timer No6

    2018-11-13 09:42:3260

    Description This timer circuit will only run when the temperature falls below a preset level. There's an alternative version - Repeating Timer No.5 - t...

  • How to build Triple Stroboscope

    2018-11-13 09:39:5960

    Circuit diagram This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circu...

  • How to build Hot Water Level Indicator

    2018-11-13 09:33:2860

    Description: A simple device to indicate various levels of hot water in a tank. Circuit diagram Notes: Save fuel bills and the economy of the planet wi...

  • How to build Keys Finder

    2018-11-13 09:07:3160

    General: Imagine that is morning , you barely anticipate the bus for work and you can't find your keys. If you suffer from this situation frequently, t...

  • How to build Clap Sensitive On-Off Relay

    2018-11-13 08:44:1660

    Description This circuit was intended to activate a relay by means of a hand clap. Further claps will turn-off the relay. An interesting and unusual fe...

  • Dual positive and negative adjustable regulator

    2018-11-13 07:29:1760

    DC DC Converters This dual regulator circuit is designed using LT3032 integrated circuit manufactured by Linear Technology and is capable to provide a ...

  • Resistor Color Code and Chart Schematic Diagram

    2018-11-13 06:52:4560

    A schematic described Resistor Color Code and Chart Diagram appears in the following illustration. Resistor is such a device for a two-terminal electro...

  • Stun Gun Circuit

    2018-11-13 06:30:1463

    Stun Gun Circuit This stun gun is powered by a 9V battery. The transformer steps up the voltage to about 1800V (but with very low current). A 555 timer...

  • Electronic Siren Circuit Diagram using 741 Op Amp IC

    2018-11-13 06:08:0262

    The schematic below appearsElectronic Siren Circuit Diagramusing 741 versatile IC. The siren can be used as the home alarm output or automobile securit...

  • How to build Circuit Board Checker

    2018-11-13 05:55:5960

    Description This little circuit indicates the basic integrity of a printed board, detecting 0V, positive supply voltage from less than 3V to 30V and fl...

  • How to build Pulse-Generator

    2018-11-13 05:20:1864

    Dual-purpose test-instrument Very simple circuitry, 1.5V Battery-operated Circuit diagram Parts: R1 1M 1/4W ResistorR2,R4 2K7 1/4W ResistorsR3 150K 1/4...

  • How to build Peak Indicator

    2018-11-13 05:03:2960

    Description A simple circuit, peak indicator of tops of musical signal. Each time where the level of signal exceeds the level 4dB, turns on led D1. It ...

  • How to build Two-Tone Siren Circuit Schematic Using One IC

    2018-11-13 04:57:1560

    Description This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and v...

  • Solve Elec

    2018-11-13 03:39:1061

    SPICE software Solve Elec software is a free piece of software that helps you to study circuits in direct current and alternating current . Solve Elec ...

  • The ATL-3 Loop Antenna

    2018-11-13 02:46:0561

    The ATL-3 Loop Antenna Description: All ATL-3 loop windings are centre tapped and balanced w.r.t. their amplifier/receiver chassis ground, and therefor...

  • ZN414 Portable AM Receiver Circuit

    2018-11-13 02:44:4860

    ZN414 Portable AM Receiver Circuit Notes: Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values sho...

  • How to build A Regularly Repeating Interval Timer

    2018-11-13 02:38:4360

    Description This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of...

  • How to build Tan Timer

    2018-11-13 02:35:4660

    Six timing positions suited to different skin types Timing affected by sunlight intensity Circuit diagram Parts: R1 47K 1/4W ResistorR2 1M 1/4W Resisto...

  • Room Noise Detector Circuit

    2018-11-13 02:29:2461

    Room Noise Detector Circuit One LED monitors three levels: 50, 70 85 dB Useful to detect too noisy environments Circuit diagram Parts: R1 10K 1/4W Resi...

  • How to build Amplified Ear

    2018-11-13 01:58:0060

    Circuit diagram Parts: P1 22K Log. Potentiometer (see Notes)R1,R9 10K 1/4W ResistorsR2 1M 1/4W ResistorR3 4K7 1/4W ResistorR4,R7 100K 1/4W ResistorR5 3...

  • TI Tina circuit simulator software

    2018-11-13 01:04:0461

    SPICE software TI Tinaas is described on the Texas Instruments website is a free analog simulator . TI TINA SPICE-Based Analog Simulation Program is de...

Maybe you like