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 Simple Long Duration Timer using OP-AMP ICs

Thursday, January 29th, 2015

Simple Long Duration Timer using OP-AMP ICs If you need to build the RC timer circuit that long time delay we need to use too many resistors and capacitors. This may have caused the error is quite large. From the change to the device degradation and leakage. This circuit allows the RC time constant of […]


 2W(2 km) 88-108 MHz frequency VHF/FM transmitter

Friday, January 23rd, 2015

This is FM transmitter in VHF range. As Figure 1 Sonar with up to 2 watts, when used with a supply voltage of about 24V. In the case of applications typically do not want a high transmission. This circuit requires only one power supply 9V Only. If used voltage level of the power supply more […]


 The twin-T complementary amplifier circuit with filter selector

Saturday, January 17th, 2015

The filter circuit of this main circuit will sent to through to the signal that middle frequency. At the same time is attenuated the others frequency into input signal to R1 through the base of emitter circuit as complementary form (T1/T2). And the feedback from the emitter lead of T1 and T2 through twin-T to […]


 Amp meter for CAR

Wednesday, January 14th, 2015

Sometimes disorders of cars on the electrical system. Can not be analyzed by the voltage of the battery, always. Using an ammeter to check. It will help to diagnose the problem better. This circuit is an amp meter LED display is not afraid of vibration. From circuit shown in Figure 1, R1 is resistor that […]


 Dynamic Compressors without power supply

Sunday, January 11th, 2015

This dynamic compressors circuit that The reduction rate of the signal up to 20 dB at input between 100 mV to 10 volts. This circuit does not use external power. But used part of the input signal into a power supply. To reduce size of the signal. A part of the input signal is rectified […]



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