All posts on September, 2009
Posted on 21 Sep 2009
Plate batteries for old tube radios are today only available with difficulty. However, step-up controllers for low DC voltages are everywhere. The circuits of these IC’s are, however, affected by disadvantages and complex wound inductances are needed. A further disadvantage of this solution is the transducer frequency; poor placing can cause audible interference.[more]
Posted on 14 Sep 2009
This mini-sumo is controlled by a PIC 16F877 micro-controller. The motors are Micromo 1717 gearmotors, and they are powered through a Texas Instruments SN754410NE one amp dual h-bridge. A single NiMh 9 volt battery provides the power for both the electronics and the motors. The tires & wheels are standard R/C racing tires & wheels for street touring cars. The IR range-finders are Sharp GP2D12 analog sensors.[more]
Posted on 13 Sep 2009
Creating PCB’s at home has always been a hassle. The basic methods available include manually laying out the traces with trace transfers , photoreproduction , or the use of a laser printer using the toner transfer method. The procedure is simple. You need some Jet Print brand Photo paper, glossy. The next step is to produce a positive image of the traces you want, using almost any editor, CAD program, etc. The image must print to the exact scale needed. [more]
Posted on 13 Sep 2009
The purpose of this project was to design and implement a reliable and cost effective wireless temperature sensing system for the recreational spa industry. This wireless product has potential applications in many other areas including, salmonid enhancement hatcheries, private/public tubs, and indoor/outdoor pools.[more]
Posted on 02 Sep 2009
Drive up to 8 RC servos to simulate the opening and closing of a turnout.Provide outputs for each servo to control the signal lights surrounding the turnout.Support for individual, bi-colour and tri-colour LEDs. Controlled by DCC. Supports configuration variables with acknowledgement. Accessory Address Lo/ Hi. Configuration byte,interactive Programming Address,enable Interactive Servo,and for each servo.[more]