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 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 […]


 How to modify to New switch replace old dimmer

Saturday, April 25th, 2015

I moved into a new house, The original owner was a British. Outlets and switches In a system of all England. Electrical system of the UK is 230V 50Hz. My wife did not like the warm white applicable to the general dimmer. Because it takes a keen eye and high power. With Incandescent size 60Wx4 […]



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