The circuit was designed to be able to obtain signals via amplitude modulation where the sensitivity and selectivity is fairly good. ... Three BC549 transistor were used to construct this circuit. ...

Amplitude modulation (AM) is widely used for not only wireless communications but also sensing and monitoring biomaterials as well as scientific data. Recently analog multipliers are attracting much ...

Figure 4 MOSFET amplitude modulator. The circuit consists of an N-channel MOSFET, two resistors, and a Schottky diode. The modulation signal, v-sig(t), is connected to the drain terminal of the MOSFET ...

Carrier Signal: Sine wave, frequency 100 kHz to 1 MHz, amplitude 1–5 V p-p. Message Signal: Sine wave, frequency 20 Hz to 20 kHz, amplitude 0.5–5 V p-p. Outputs: Modulated AM signal. Demodulated ...

With the Er8 sample an inverting amplifier (IA) was built by using a field effect transistor OPAMP TL081 as shown in Figure 1. In such a circuit, if the I bias is negligible compared with the currents ...