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 Old low noise pre tone using RC4739

Wednesday, April 22nd, 2015

A stereo pre amplifiers with tone control circuit that has been popular for more than 40 years is this circuit which use the RC4739 as main components. Due to its features that the bass heavy, and treble sound is crystal clear. Due to its features that the bass heavy, and treble sound is crystal clear, […]

 First times electromagnet learning for my son

Monday, April 20th, 2015

My son like to play the magnet a lot like general children. And He read science books Found content with magnetic. He read science books Found content with magnetic. We take the 24 SWG Coated copper wires turns on the diameter core of about 5mm screws is about 100 turns. Then we scrape the insulated […]

 FM transmitters, 90-100MHz using two transistors and low voltage

Sunday, April 19th, 2015

Today lets to see the simple FM transmitters,90-100MHz that use two transistors, apply power supply with 1.5V battery The coil-L is 8.5 turns of 22 swg wire wound with a inside diameter air core of about 5mm. Then stretch the coil to width of 9 mm.  Figure 1 The schematic circuit diagram To tap out […]

 How to basic use LEDs

Friday, April 17th, 2015

My son is very interested in the LED. He want to created the simple LED flasher circuit. But we should learn the principles of the LED before. Started to use the LED circuit as Figure 1. Includes Battery, Resistor and LED – Its shape – symbols (When drawing the circuit, if the actual shape it […]

 50W-75W Stereo power amplifier using TDA2050

Tuesday, April 14th, 2015

We used the TDA2030 to build many power amplifier projects, but they have lower power than 30 watts. Today, we try to use the TDA2050, which has the output power about 50 watts that shape and easy to use as well. This project is stereo that easy to builds can adjust volume, tone and balance […]

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