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 100-150W Super Hybrid Low THD Power amplifiers using STK-4048

Sunday, May 3rd, 2015

This amplifier series circuit is very special that low distortion about 0.003% only. The heart working of this circuit is the hybrid IC of Sanyo. It is usually found in expensive audio equipment. The ICs that uses has three wattages to choose the number below. STK4044XI = 100W STK4046XI = 120W STK4048XI = 150W As […]


 FM transmitter 88-108MHz using two transistors and 1.5V battery

Friday, May 1st, 2015

This is also the 88-108 MHz FM transmitter circuit that use 1.5 volts battery power supply source and use two-transistors so easy to builds and small size circuits. Figure 1 the schematic diagram Figure 2 the components layout The coil-L is 8 turns of 22 swg wire wound with a inside diameter air core of […]


 How to use a Battery Tester by Chayapol

Thursday, April 30th, 2015

A basic electronic learning what is needed is a battery. Because I do not want him to use the AC-line, which could be dangerous. So we store it in a lot of batteries. Sometimes project electronic does not work well, may have caused Batteries broken, or worn out…should be replaced. Normally, I tend to use […]


 RF immune power supply with RFI elimination

Tuesday, April 28th, 2015

This is the RF Immune power supply with RFI elimination for Amateur radio. A typically Radio transmitters use High-frequency transistors as current driver so can cause very severe electromagnetic. Therefore, The power supply must be able to make the current higher than 10A. Figure 1 the schematic diagram RFI elimination This circuit must have the […]


 1.5V FM transmitter using a varicap diode and two transistors

Sunday, April 26th, 2015

This circuit is a 1.5V FM transistor circuit that use also two transistors like others circuit before. But this circuit is special that we use a varicap diode. Figure 1 is a schematic diagram – This circuit use the varicap diode number: SD111 or will use number 1S553, 1S85 instead. – The both transistors will […]



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