Although this kind of voice effect can be obtained by means of some audio computer programs, depending on the equipment you are using this microphone input and loudspeaker output could be more versatile. This design uses a variable gain microphone preamplifier built around IC1A, a variable steep Wien-bridge pass-band filter centered at about 1KHz provided by IC1B and an audio amplifier chip (IC2) driving the loudspeaker.
Telephone Call Voice Changer – [Link]
Top quality rocker switch with an IP65 protection can be available even for a very competitive price. It is the case of a novelty in our offer – Marquardt 1932.3112.
Series 1930 may be probably familiar to you, for example from our article Series 1930 – Double Pole Rocker Switches with IP65. Till now, we had in stock types 1935.x with green and red backlight.
We react to your requests for switch with the same excellent properties but without a backlight and for as good price as possible. Type 1932.3112 from company Marquardt features an advanced construction with an integrated gasket, thus the switch doesn´t require any other sealing or a special assembly procedure to reach IP 65.
With the price under 2 EUR/ pcs and a considerable stock level, we´re able to offer you a top quality switch for a very affordable price. The switch contains a reliable mechanism with a long lifetime and handles up to 120A inrush (capacitive) current.
In case of interest even in other versions, please contact us at firstname.lastname@example.org.
Say stop to dust and water with the Marquardt 1932 switch – [Link]
Scott Torborg and Star Simpson writes:
Google Glass is not only difficult to come by but requires tremendous skill to teardown. Scott Torborg and Star Simpson, in cooperation with SparkFun, took a look inside the sought-after device. They then graciously agreed to share the teardown as a way to “give back” to the engineering community. What follows is their look inside Google Glass.
Teardown: What’s inside Google Glass? - [Link]
Steve Taranovich writes:
This is a first in a series of stories called “EEvolution of an idea” showing how a good idea got its start and evolved into a viable product in the electronics industry. I would ask our faithful EDN readers to comment on this series idea and if there is a good positive response which views this as something useful and educational to our readers, then I would like to continue with more interesting and innovative stories like this.
I was recently alerted to an innovative new product called the PortPilot in a comment to an article on EDN.
PortPilot Pro is an inline USB power analyzer, designed by J. Loren Passmore. Passmore describes himself as “an entrepreneur who consults with companies in a variety of industries to envision innovative products and speed their path to market.
Innovative inline USB power analyzer - [Link]
DanNixon @ instructables.com writes:
I just happened to see some large strips of LED lighting when I was picking up some parts at Maplin which were on sale (if I remember correct they were around £12 per approx. 2m strip) however the controller/driver was still around £40, so I thought I would just build a better one myself.
I wanted it to be a web enabled controller as there are a lot of cool things that can be done with a device once it is accessible over HTTP, and I am working on a home automation server project so it would be good to have some devices which I can test this with.
Arduino Web Enabled RGB Lighting - [Link]
This Instructable will demonstrate the building of a bare bones (and really inexpensive… less than $5) Arduino compatible module that can be put together on a small piece of stripboard and can be used either on a breadboard or independently.
YABBAS – Yet Another Bare Bones Arduino (on Stripboard) - [Link]
steveastrouk @ instructables.com writes:
This is useful tip for anyone making or using surface mount components on PCBs. It relies on access to a laser cutter, so if you don’t have one, look away now….. I cut a plastic stencil on the laser, align it with the PCB pads and then squeegee a thin layer of solder paste through the holes. Peeling away the stencil will leave a perfect pattern of pads with the correct amount of solder on each one. I have just successfully used this process on components with a 0.025″ pitch (0.65mm) – that’s VERY small,
Soldering stencils for DIY circuit boards - [Link]
T.K. Hareendran writes:
All items stored in a deep freezer will thaw out if, for some reason, the temperature inside the freezer rises to the thaw point. However, a freezer monitor alarm can warn you of the rising temperature before the thaw point is reached.
This simple circuit is powered by regulated 9V and built around a few discrete components that are readily available in the market. Current consumption of the circuit is only a few milliamperes in idle state. So you can also use a 9V 6F22/PP3 type compact battery for powering the circuit.
Freezer Monitor Alarm - [Link]
machinegeek @ dangerousprototypes.com writes:
panStamps are small open source wireless modules designed to add RF connectivity to sensors, MCUs and similar projects. The crew at panStamp is in the process of developing a new module based on the TI CC430F5137 SOC. Programming will be via the Arduino IDE, facilitated through a port being developed by the open source Energia project.Commercial release of this new line of panStamps is planned for September-October. For more info visit PanStamp.
panStamp developing MSP430 based module - [Link]
Arduino quadcopter iPhone control:
This Arduino Quadcopter by Kyle Fieldus has iPhone Control, similar to the AR Drone you can tilt the phone to control the quadcopter. Touch OSC is being used to design the phone interface, there is also an Android version available. The system chain is a bit complex since the phone is sending the input data to the computer, the computer determines what should be done on the quadcopter and sends these commands to a computer tethered Arduino via USB. The computer tethered Arduino finally sends the commands to the quadcopter mounted Arduino via Xbee. All of the code and instructions will be made available as soon as this University project has been handed in and graded. You can see the first video here that was taken when the Xbee link between the two Arduinos was tested.
Arduino quadcopter iPhone control - [Link]