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Recent New Posts


 Two way 12 LED running lights using CD4017 and NE555

Thursday, March 13th, 2014

This Two way LED running lights to use for beautiful, this circuit uses 12 LED lamps, arranged in 2 rows, each row of 6 leds. A green one and a red one, alternatively. use a different color for this. Technical information -The power supply of 6-12 VDC. -Power consumption is about 12 mA maximum -Have […]


 5 channel graphic equalizer by BC548 transistor

Tuesday, March 11th, 2014

      The graphic equalizer circuit the frequency adjust circuit. For some kinds of audio frequency response is not smooth. The frequency offset by the tone controls, may not work well. Because the bandwidth is too wide. , Requiring the use of e-equalizer circuit with a narrow bandwidth and is divided into frequency bands increased to 5 […]


 Micro Inverter using TIP41 or 2N6121

Monday, March 10th, 2014

This is Micro inverter or The inverter very small-sized, perform modify from the energy battery the small-sized , have the value voltage about 220V AC Volt 50HZ. By the circuit composes 2 transistors performs pulse oscillator generator or Square wave generator, for drive the coil transformer have voltage tall about 220V at 50Hz frequencies. By […]


 Power supply regulator +15V -15V 1A by IC 7815 & 7915

Monday, March 10th, 2014

When I builds the circuit Pre tone control by IC LF353 the finished , but can not be usable. Because of it wants a power supply +15V GND -15V at 500mA current. I pairs then builds the group Dual DC power Supply +15V,GND,-15V. By use pillar equipment be IC 7815 , for +15V and IC […]


 ECG simulator using CD4521 and CD4017

Saturday, March 8th, 2014

ECG is very useful in the medical community. Such as experimental research and development of bio-medical imaging. But this should not be taken with patients because we do not want that. The real purpose is that it is used to preview a heart rate only. In general measuring the rate of heartbeat will get a […]





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