Computer Interface Digital Multimeter also DIY !

High voltage input DC-DC buck converter

  Digital multimeter with computer interface in general prices are high.  Rarely have the majority of enthusiasts.  In fact, the technology is not complicated, read this article, you will feel a refreshing feeling.

* Provide detailed information and AVRMCU of the source.

  Common DC-DC applications are mostly for low-Vin / Vout voltage (below 30V-40V).  The case for higher input voltage is very rare, this paper introduces a kind of TL494 is the controller can work in 60V input of the buck converter.

Self-made "Little Dot" high-fidelity headphone amplifier

12V7AH lead-acid battery charger

  Details of the owners made this "small non-point amp" process, using dedicated IC (max4410), sound quality, high signal to noise ratio.  Chip Price only $ 0.95.   Is even more incredible is that her power as long as the two 1.5V batteries on OK! ... ... (More chart)

Using the new chip switching power supply chip TNY255, the use of small components, small size, high efficiency, while the costs are quite ordinary charger.

No longer an ordinary blowing hot air gun welding SMD chip components to worry about being blown away. Through this modification it can be directly comparable to a professional hot air gun. Easy to start.

  This is a special chip LA7688 using television interface board design, the circuit is simple and easy system.

  Has been used for Sharp 7 inch analog LCD screen (model: LQ070T3AG02), good effect.