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 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 […]


 How to use LED with 3V battery by Chayapol

Saturday, April 25th, 2015

Today, my son Learn to use the LED for the 3V battery. As we know, a voltage of about 1.8V LEDs like the most,Proper light, not heat and Power consumption of approximately 10mA to 20mA only. Figure 1 he measure the voltage of two AA 1.5V battery in series We use the breadboard and the […]


 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, […]



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