Here’s a unique circuit for guitar effects builders. It uses readily available SIP sockets to allow easy transistor swapping. Experiment with different values for a personalized sound - and change it up on a whim. You can also recreate a bunch of popular pre-existing fuzz distortions with it:
Some of the fuzzes you can make after building this layout are the Basic Fuzz Face (with R.G. Keen Mods, Roger Mayer Mods, Fuller Mods), the Vox Tone Bender 5/67, runoffgroove.com’s Sili-Faces, fuzzcentral.com’s Axis Face Germanium and Silicon, Joe Gagan’s Easy Face, Aron Nelson’s Hornet, the Gus Fuzz Face, Tim Escobedo’s Many Faces, the Boutique Fuzz, and the Miss Piggy.
Guassmarkov’s site has some great tutorials on using op-amps and other basic electronic parts. There’s a boat-load of schematics, PCB images, and Eagle CAD files on there as well. [via]
20W Audio Amplifier kit is based on LM1875 IC.
* Power supply
- 48 VDC
* Output - 20 W, 4 Ω
* Very low distortion (THD - 0.015%), good channel separation and ripple rejection
* IC built-in thermal, short circuit protections
* Internal output protection diodes
* Terminal pins for connecting input
* Power Battery Terminal (PBT) for easy power supply and speaker connection
* Power-On LED indicator
* Heatsink for IC
* Four mounting holes of 3.2 mm each with nut and stud
* PCB dimensions 48 mm x 60 mm
We live in the information age. Your phone knows where you like to eat, computer programs know what movies you like better than you do, and going to a party can mean going in this life, or a Second Life. So why is your message of love still stuck in the 16th century? These days it takes more than a sonnet to melt a girl’s heart. This video tutorial shows step-by-step how to make a Valentine’s Day card for the digital age. The NerdKits team shows how to make an LED Heart Valentine’s card powered by a microcontroller. The heart features an LCD screen for a personalized message, and 20 LEDs around the perimeter that can be programmed to show any pattern. The code provided contains a “twinkle” function that randomizes the process to provide a true star-like twinkle.
This is an electronic digital caliper to computer (RS-232) interface. This will work with the inexpensive calipers, micrometers and height gauges that are typically made in China. The connector on the measuring instrument will have 4 pins, and the owner’s manual will typically describe the output as 24 bit 90 kHz synchronous. This does not work the name brand instruments - Fowler, Mitutoyo, Brown & Sharpe, etc.
The caliper sends a burst of data approximately three times each second. Each burst contains 48 bits of data as shown in timing.pdf. The first 24 bits are the position relative to the zero point set on the caliper. The second 24 bits are the position relative to an arbitrary zero that does not change. This is sort of an absolute position, but the zero point changes each time the caliper loses power. Each 24 bit value is in ones compliment form (1 sign bit, 23 data bits). This allows for a 0 and a -0. The unit of measure is 1/20480th of an inch. [image source: www.hobbytoolsupply.com]
So this time I decided to make pretty simple but powerful enough audio amplifier. For this I’ve chosen quad bridge car audio amplifier TDA7384 which has four input and four output channels with power capability 4×35W(4Ω). If connect to car battery where operating voltage is about 13.2V, then each channel can give 22W(4Ω). TDA7384 is an AB power amplifier cased in flexiwatt25 package which is designed for high end car radio applications. Full schematics and PCB is inluded.
Today, although the wireless technology grows very fast, the long distance funicular communication still keeps its popularity. The reason is obvious that cost and complexity is high at the wireless communication.
RS232 is probably one of the most used, easy to develop and easy to apply communication protocol. We generally encounter to this standard at the MCU applications. But it has some restrictions. It allows us to use maximum 15 meters cable. Good wiring, low baud rates and less noisy mediums may allow us to exceed this limit a little more. The main problem here , when the distance increases, the noise at the common ground line also increases. Another issue, RS232 allows only two devices to communicate reciprocally. More than two devices can not communicate at this line and we need another solution for this situation.
RS485 is the standard that solves this problems. The main difference is, RS485 transfers the data depending on the potential difference between the two communication wires. The polarity defines the logic state of the signal. You can transfer data up to 1220 meters far away and with a rate up to 10 Mbs.
5 LED VU Meter kit is based on LB1409 IC from SANYO, which will indicates the volume level of the audio signal it senses
* SUPPLY 12V DC @ 50mA
* PR1 REF SET
* PR2 AUDIO LEVEL SET
I have done a simple infrared remote control receiver with RS232 ascii output. It can be used for developing remote controls on a PC using the serial port. In practice, the infrared bursts are converted in ascii characters and sent to the RS232 port. The downloadable ZIP file contains the schematic diagram
, the printed circuit board, the components disposition and the object file to write into the ATMEL ATtiny2313 microcontroller.
![[HOW TO] Make your own Metronome](img/79.jpg)
Daniel has a great how-to on making your own metronome
CMoy is a very simple and portable headphone amplifier. The amplifier was originally posted by Chu Moy on headwize.com. Headphones amplifiers are usually used when the output of a device is to low for the kind of headphones you’re using, or to get better sound quality by keeping the device on a medium volume setting and amplifying the sound with the headphone amplifier. I’ve not build this amplifier so far, so i cant tell you from my personal experience if it sounds good or bad, but from what i read on the internet, users that build it are very happy with the results. The schematic is very simple, parts are easy accessible so it should go really smooth with the building process if you decide to do it.
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