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Recent New Posts


 Battery voltage monitor circuit by LM339

Friday, June 20th, 2014

This simple low voltage tester circuit can be used to monitor battery and other voltage sources of current for problems, by LED display and alarm sound. Which this circuit is used to check voltage of 9-volts battery. Description We use a LM339 Quad Comparator 14pin IC is base of this circuit and a few parts […]


 A on-shot circuit ideals

Friday, June 20th, 2014

The digital circuit additional a circuits taht is very useful is On-Shots circuit or Also known as Mono-stable multivibrator circuit. This behavior is the input trigger signal into just a single pulse,which is usually a lot of thin or narrow. And then this circuit will output is pulse out there. But width of the pulse […]


 Cricket voice with buzzer using LM324

Wednesday, June 18th, 2014

This is a cricket voice circuit which is an another Sound effects generator byLM324 op-amp and emit by a buzzer. And they have sound similarly the crickets are singing a couple we’ve ever heard. In circuit we don’t use any microcontroller ICs so you can build easily them and also cheaper. Technical information – Use […]


 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. *** […]



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