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Recent New Posts


 12V Battery charger using UJT

Tuesday, June 17th, 2014

      This is an 12V battery charger circuit that can automatic battery charging, they uses the power SCR and UJT transistors are main parts. And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully […]


 The most lead-acid battery charger circuit by LM317

Tuesday, June 17th, 2014

When you want to build the lead-acid battery charger project for 6V battery or 12V. Although there are many methods to choose from. I like using IC LM317 Because easy to use, with minimal equipment. Cheap and good. Today, I try to collection ideas for the battery charger circuit. This is just part one. *** […]


 The 4 sound effect using UM3561

Sunday, June 15th, 2014

Here is a 4 sound effect that use one IC-UM3561 and a few parts only. It can make siren, Ambulance sirens, Police car sirens, Fire truck siren and Space Machine Gun Sound effect How it does works As Figure 1 is the circuit diagram. To begin with R1 is connected to pin 7 and pin […]


 AM simplify radio with earphone

Thursday, June 12th, 2014

This AM simplify radio with earphone is a saving version that use a few parts, cheap , easy to build and Suitable to be assembled to study. Technical information Use power supply of 3 Vdc. Maximum consumption current about 45 mA PCB size : 2.38 x 1.24 inch. How does it work. A circuit diagram […]


 How to apply an inductor from the compact Fluorescent Light Bulb Burned Out

Wednesday, June 4th, 2014

Hi Friends. In the present a small electronics invention. Most of these types of switching circuit. is… An Inductor (or coil) is one device To create problems for me To buy or use. But it is only simply a wire wound into a coil and usually around ferrite core because they have high value and […]



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