FM Receiver circuits with PCB
This is FM receiver circuit using sex transistors that very small size and cheap, The trimer capacitor To control the frequency from 87MHz to 108 MHz. Read more
Wideband Active Antenna amplifier circuits on SW/MW/FM
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
4 Peak voltage tester circuits using op-amp and 723
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
220V AC siren circuit using transistors
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
NE566 Function generator | Voltage Controlled Oscillator VCO circuit
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