This vintage radio can play AM, FM, and MP3, all with a classic sound. Inside you’ll find a new AM radio tube-amp, providing the functionality you’d expect from the device. The rest of … ...

The second AM modulator has U2D with U1B and U1C. In a common configuration as a multiplier circuit, Figure 23 has Vin2 as the modulating signal and Vin1 as the carrier signal. We want to show that ...