These are the wideband active antenna circuits for the SW/MW/FM radio receiver. We can try to test it with many brands of radios. Why should we use this circuit? In normal, we short-wave radio receiver. We need to use a long antenna. But with the helping of this circuit, we can use the only 18-inch … Read more
If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. Precision Peak voltage detector with a long memory time We use this circuit The op-amp IC number CA3140 is the main equipment, acts … Read more
This AC 220V siren circuit is a simple siren that uses 220V AC as a power supply. It is small size and uses a piezo speaker cause use low power and saving. How it works This circuit is shown in Figure 1 which we use power source by reducing AC-voltage of 220 volts down by the resistors-R1, … Read more
We have many ways to make the function generator. Using NE566/LM566 is a good choice. Because it easy to use. It looks like a NE555 timer. And we often use the NE566 as Voltage controlled oscillator or VCO circuit. It is a type of oscillator. We can control the frequency of the output with the … Read more
Here are the function generation circuit lists. Why use them? They are suitable for use or test the various electronic circuits. These circuits can generate 2 or 3 waveforms such as square wave, triangle, and sine waves from 1Hz up to 1MHz. In different amplitude. You can use a lot of components, transistors, instant ICs, Op-amp, … Read more