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Recent New Posts


 How to use AAA battery in parallel to increase current.

Monday, April 28th, 2014

I get a lot AAA 1.5V battery from my friend. If still store them, will not have any helpful. Now I have a wall clock which use AA battery size. So cannot use with them. But it not hard over than our endeavor. We need to use AAA battery holder. But I cannot buy it […]


 Simple Non-Contact AC Mains Voltage Detector

Friday, April 25th, 2014

This is simple non-contact AC mains voltage detector next one circuit that use all transistor as main. Which many friends like this circuit. It use CD4060 as main,some people say that Can not find it. Today I would like to introduce another interesting cycle, because the transistor. It is certainly easy to buy. And also […]


 How to make simple electronic buzzer

Monday, April 21st, 2014

A electronic buzzer is simple. But useful well worth and the price is lower than 1$. By use just a 9-volts battery only. So without worrying about electrical leakage or electric shock from 220V to buzzer. Unless also has LED will glow. Show that the circuit the normal operation as well. The working of circuit. […]


 Automatic light switch circuit

Monday, April 21st, 2014

We’ve watched a lot of Automatic night light switch circuits. Which I like to use a transistor as base. But now we lets to see IC-op-amp. It is also very simple. As my feelings It has high sensitivity more than one, and with great high accuracy. How does it works. A light detector component, we […]


 Simple Two digits counter using CD4026

Friday, April 18th, 2014

This is a simple two digit counter using CD4026 as main parts can display with LED 7 segment 0-99 number There is a reset button to restart. It can be applied to, for example, counting products, counting people into the library, and more. The working principle As circuit in Figure 1. The IC1, IC2-CD4026 4026 […]





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