diy-electronic-projects.com
Sound Level Indicator - circuit diagrams, schematics, electronic projects
http://www.diy-electronic-projects.com/p151-Sound-Level-Indicator
You are here: home page. VU meters and spectrum analyzers. This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20dB for loud sounds. 1) The electret microphone is powered by and has a load of R1 from an LM2931 5V low-dropout regulator. B) Q2 emitter-follower transistor quickly charges C8 w...
diy-electronic-projects.com
Telephone - all subcategories - list of projects, page 1
http://www.diy-electronic-projects.com/c7-1-Telephone
You are here: home page. Telephone - all subcategories. Cellular Phone calling Detector. Author: RED Free Circuit Designs. Small telephone bug. Listen telephone line on your FM receiver. It is self powered. Small part count. 8 Line Intercommunication using 89c51. The Link P - Privacy Link! Soft Musical Telephone Ringer. Power and high voltage. Doorbell for the Deaf. Magic Wand Conjuring Trick. Led display digital Voltmeter. 500W low cost 12V to 220V inverter. Low pass filter - Subwoofer.
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Audio - all subcategories - list of projects, page 1
http://www.diy-electronic-projects.com/c1-1-Audio
You are here: home page. Audio - all subcategories. Low pass filter - Subwoofer. Low pass audio filter for subwoofer with TL064 integrated circuit. This audio amplifier is built about most famous 2N3055 transistors. 200W audio amplifier with TDA2030 with power supply circuit included. 100w RMS audio amplifier with transistors. Author: Graham Maynard and Andy Collinson. 10W Audio Amplifier with Bass-boost. High Quality, very simple design. No need for a preamplifier. Author: RED Free Circuit Designs.
diy-electronic-projects.com
iButton electronic lock - circuit diagrams, schematics, electronic projects
http://www.diy-electronic-projects.com/p268-iButton-electronic-lock
You are here: home page. Fig1 Schematic diagram of iButton electronic lock. When the door goes open, a 3 sec pulse is triggering the solenoid. When we press the door open button the door remains open as long as we push it. Fig 3 Programming steps for adding a new key. To add a new key, the following steps should followed:. 1 Press programming button. 2 Led displays letter P that indicated you entered programming mode. 3 Touch the master button in socket. 6 Touch the new key to the socket. To remove an al...
diy-electronic-projects.com
3 Channel Spectrum Analyzer - circuit diagrams, schematics, electronic projects
http://www.diy-electronic-projects.com/p33-3-Channel-Spectrum-Analyzer
You are here: home page. VU meters and spectrum analyzers. 3 Channel Spectrum Analyzer. 3 Channel Spectrum Analyzer. This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range. The circuit will take line level output from most any audio source, and operates on 12V DC. This means that it can even be run in a car. R1 100K 1/4W Resistor. R2 820K 1/4W Resistor.
diy-electronic-projects.com
Simple but reliable car battery tester - circuit diagrams, schematics, electronic projects
http://www.diy-electronic-projects.com/p48-Simple-but-reliable-car-battery-tester
You are here: home page. Simple but reliable car battery tester. Simple but reliable car battery tester. This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. This circuit is very easy to explain:. The calculations are simple (default). For the first comparator the voltage is : 0,833 V corresponding to 8 V. Voltage is : 0,875 V corresponding to 8,4 V.
diy-electronic-projects.com
List of electronics projects categories. Circuit diagrams of all kinds. Build your own gadgets
http://www.diy-electronic-projects.com/electronics-projects
You are here: home page. Simply click on some category to see list of projects. Power and high voltage. Some of recommended projects:. 10 Amp 13.8 Volt Power Supply. Power and high voltage. Doorbell for the Deaf. Magic Wand Conjuring Trick. Led display digital Voltmeter. 500W low cost 12V to 220V inverter. Low pass filter - Subwoofer. Basic UPS Power Supply. High And Low Voltage Cut Off With Time Delay. Promote Your Page Too. Disclamer and Privacy policy.
diy-electronic-projects.com
Microcontrollers - all subcategories - list of projects, page 1
http://www.diy-electronic-projects.com/c10-1-Microcontrollers
You are here: home page. Microcontrollers - all subcategories. Author: Leonid Ridiko, Victor Lapitskiy. Ponyprog Circuit for ATMEL'S AVR. Ponyprog Circuit for AVR and PIC16F84. Funcard Programmer by Diesel. Producing your own Decrypt Viewing Card Mk2. Author: JOOS DESIGN and PAUL ARNOLD. Power and high voltage. Doorbell for the Deaf. Magic Wand Conjuring Trick. Led display digital Voltmeter. 500W low cost 12V to 220V inverter. Low pass filter - Subwoofer. Basic UPS Power Supply. Promote Your Page Too.
diy-electronic-projects.com
Light & LED - all subcategories - list of projects, page 1
http://www.diy-electronic-projects.com/c4-1-Light-and-LED
You are here: home page. Light and LED - all subcategories. Author: Rev. Thomas Scarborough. 12VDC Fluorescent Lamp Driver. 6 Channel Auto Reverse Sequential Disco Running Lights. Learn digital electronic through fun using LEDs and CMOS integrated circuits. Doorbell for the Deaf. 6V Ultra-Bright LED Chaser. Interesting light for your bicycle. Made of LEDs. Very nice! Magic Wand Conjuring Trick. Author: Rev. Thomas Scarborough. Power and high voltage. Doorbell for the Deaf. Magic Wand Conjuring Trick.
diy-electronic-projects.com
Sensors & control - all subcategories - list of projects, page 1
http://www.diy-electronic-projects.com/c20-1-Sensors-and-control
You are here: home page. Sensors and control - all subcategories. This circuit emits a beep and/or illuminates a LED when someone touches the door-handle from outside. The alarm will sound until the circuit will be switched-off. Author: RED Free Circuit Designs. Author: RED Free Circuit Designs. Author: RED Free Circuit Designs. Power and high voltage. Doorbell for the Deaf. Magic Wand Conjuring Trick. Led display digital Voltmeter. 500W low cost 12V to 220V inverter. Low pass filter - Subwoofer.
