Bastl3r wrote this instructable detailing the build of his guitar booster pedal project:
I chose an overdrive pedal design off of generalguitargadets.com (Schematic) and modified it like this:
added a simple positive/middle/negative supply
added a noise filter I found on beavisaudio.com right after the DC Jack (Huminator)
took away the clipping diodes on the output
connected the diodes in the feedback path directly
added the switch to change the resistance of the feedback path (10k <->30k)
Guitar booster pedal (MPX-1) - [Link]
If you have an application, where you work with kilovolts and you need a suitable diode, we have a solution for you.
It´s not a quite common thing, to find a diode with a reverse voltage of more than 1000V in your “home-drawer stock”. But you develop a device, requiring a diode with a substantially higher reverse voltage and nothing suitable is by a hand …
The help is simple – use the DD1000 diode or in case of higher currents, choose a suitable type from the portfolio of High-voltage types from Diotec and send us your requirement. DD1000 features VRRM up to 10 000V, but in respect to its small dimensions and a construction, it´s suitable only for currents up to 20mA. This is sufficient for construction of various testers, voltage multipliers and similar. Should you require higher currents, many suitable types are available, which still maintain compact dimensions. For more powerful designs, it´s possible to use for example a cylinder type SI-A („hockey puck“) with a screw connection allowing for simple series connection (eventually also with RC cell).
Direct 10 000V where ever you need - [Link]
Here’s a proximity-sensing LEDs project by Will_W_76. He writes a complete step-by-step instructions:
So how does this all work? What makes it proximity-sensing? Remember in the explanation above that the photo-transistor acts like a switch. So when the photo-transistor is off, no current is flowing across it to our blue LED and the LED is off as well. Now look at the other side of our circuit. That’s where the IR LED is connected, and it is connected such that it is always on and emitting 880nm infrared waves. Remember that I also mentioned the photo-transistor is set to respond best to wavelengths of 880nm? That’s how the proximity-sensing works! When an object (such as your hand) goes over this little “cluster”, IR light of 880nm is emitted from the IR LED. This light reflects off of your hand and back to the circuit. When the photo-transistor picks it up, it turns on allowing current to flow through from the source to our blue LED lighting it up!
Proximity sensing LEDs - [Link]
App note (PDF) on NXP’s Agile I/O expander, discussing its capabilities and how to use it efficiently.
I2C-bus GPIO devices are widely used and expand a control processor’s pins to 8-, 16- or 24- bits of general-purpose input or output. The characteristic of these I/O needs to be accurately known to efficiently use them in a system. This application note will explore the actual electrical characteristics of Agile I/O GPIO pins.
App note: Low Voltage Agile I/O GPIO Input/Output Characteristics - [Link]
Any microcontroller must have I/O pins for taking inputs and providing outputs. The ATXMega32A4U just like any other micro has 34 programmable I/O pins divided unevenly amongst six IO ports. Most I/O ports are 8 bit wide. XMega I/Os have digital, analog and special purpose functions. Some I/O pins have more than one use. A quick view of the XMega I/O pins reveals the purpose of these pins.
XMega I/O Ports - [Link]
Pleasant actuation characteristics and reliable features of a push button switch Marquardt series 1840 make it attractive for all applications where you require control by a push.
Classic push-button switches are favorite for many decades, maybe also because they´re well known already from the beginnings of electronics. Probably, a nostalgia is not the only reason making them popular, but mainly an easy control, when even an unacquainted person knows, that it´s something “what has to be pushed” to change a status of an electric device.
Exactly a term “to change a status” is important, because at these switches it´s not possible (or not easily visible), whether it´s switched on or off. Though it´s true, that the majority of such switches is a little bit pushed down (lowered) in a switched on status, but the difference is often small. That´s why these switches are not suitable for applications, where from safety reasons it´s necessary to know tha status of the switch before connecting to a mains line.
Switch 1841.1301 (SPNC) belongs to a top in this segment and offers a really pleasant control and a quality switching system with a mechanical endurance of min. 100 000 cycles. 6A/ 250V is far sufficient for many applications and assembly is simple – by means of an M12 nut supplied. An interesting supplement is also a neoprene cap integrated with an M12 nut, enabling to gain a considerable resistance to water and dust. Also available are 2-pole versions – 1842 and also versions functioning as a push-button (momentary).
There are 2 nuts supplied. One is “regular” – hexagonal and the other one is a round type intended to be used as a top cover on a front panel. Further detailed information will provide you the Marquardt 1840 datasheet.
Marquardt 1841 – above standard classics - [Link]
International Rectifier have announced the introduction of the IR66xx series of high performance 600V ultra-fast Trench-gate Field Stop insulated-gate bipolar transistors (IGBTs). The new high power family of devices features extremely low conduction and switching losses optimized for welding applications.
Utilizing Trench thin wafer technology to offer lowest conduction and switching losses, the new devices are co-packaged with a soft recovery low Qrr diode and feature ultra-fast switching (8 KHz – 30 KHz) with 5 µs short circuit rating. The 600 V IGBTs also feature low VCE(ON) and positive temperature coefficient for easy paralleling.
IR Launch Welding IGBT - [Link]
A breakout board for the 555 timer exposing the leads astable or monostable implementation.
Hello, my name is Patrick Grady and I’m a highschool senior in the US. I’m an avid programmer and tinkerer and love anything related to electronics and computers.
This past winter I took a class in Digital Electronics and was introduced to the 555 timer. One of the most common applications of the 555 timer is the astable mode, which is unfortunately rather clunky to build on a breadboard. This 555 breakout board does more than expose the 555′s eight pins: it sets you up to run your 555 timer in astable mode with slots to insert two resistors and a capacitor of your choice. This board eliminates all the wiring for the 555 timer. The 555 Timer Breakout Board Plus will cut out the tedium of setting up the 555 timer and will allow hobbyists to dig straight in to their projects.
As a electronics hobbyist myself, I recognize the usefulness of this simple device, but also acknowledge its relevance is limited to the niche market of hobbyist electronics. If you want this device or think a friend could use it, please contribute to the campaign and buy a 555 timer breakout board!
555 Timer Breakout Board Plus - [Link]
A four-channel remote control built using the EnOcean Pi by Kerry Wong:
In my last couple of blog posts, I did a brief overview of the EnOcean Pi sensor kit from Newark and demonstrated how to compile and run the example code using a Raspberry Pi. In this blog post, I will show a real world example – a four-channel remote control built using the EnOcean Pi in conjunction with the EnOcean pushbutton module.
A four channel remote control using EnOcean Pi - [Link]
The Self-organizing Systems Research Group at Harvard has created a “thousand robot swarm“, named Kilobots, which can self-arrange themselves into shapes and patterns. Each robot in the group moves uses two vibrating motors to move and an infrared TX/RX pair to communicate with its neighbors and to measure their proximity. The Kilobot robot software and hardware design are available open-source for non-commercial use.
Self-organizing Kilobots - [Link]