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 98-100MHz FM transmitters using one transistor and 1.5 volts battery

Thursday, March 12th, 2015

This is the small FM transmitters using one transistor and 1.5 volts battery as power supply, in 98MHz to 100 MHz FM frequency range. The coil-L is 8 turns of 18 swg wire wound with a inside diameter air core of about 5mm. Then stretch the coil to width of 9 mm. The T1 use […]


 500 watts MOSFET power inverter using SG3526-IRFP540

Thursday, March 5th, 2015

As the 200 watt inverter Many people want to create a project of large power inverter about 500 watts. In order to use the multiple appliances at the same time. And can also be used on a large bus as a bus or coach, too. Adding a 200watt into 500 watts is simple.We use the […]


 The Op-amp IC tester circuit

Sunday, March 1st, 2015

This is an simple op-amp IC tester circuit that cheap and easy to build. for test many op-amp ICs fast check. How it works In Figure 1 is the schematic diagram of this tool, that is used to generate the square wave. The working of circuit for the OP-AMP is the tested IC will generate […]


 Let’s build the digital multimeter using ICL7107

Sunday, February 15th, 2015

We can modify the dc digital meter circuit to smart full function multimeter, that versatile available. For example : measure DC voltage, ACV, DC Amp meter, AC Amp meter and as the Ohms meter etc. Try to build this projects to use it really worth Fully enjoy Special Feature DC Voltage: 200mV, 2V, 20V, 200V, […]


 Super boost bass by UA741

Tuesday, February 3rd, 2015

This General purpose boost bass circuit is low pass filter that famous for decades over the years,can be used to increase the bass to the amplifier gain. The characteristics similar to a normal tone control circuits, It is designed for high frequency in the Flat form. But The low frequency or bass can add more […]



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