Direct Conversion Receiver with 2 Transistors

Direct conversion receivers are a joy to operate if they are well designed. The "2 BJT RECEIVER" has a single balanced diode mixer, a tuneable VXO and a single stage AF amplifier. This receiver is build within 2 hours even for the less experienced ham. A 40m version is shown here. However, this receiver will work on any other frequency between 3 and 30 MHz if fundamental mode crystals are used. Play with the values for the capacitive divider in the base of the oscillator transistor if used for other frequencies. It should well perform for 20/30/40m with the give values here. Just change the crystal for other frequencies. A high impedance headphone is mandatory. This receiver will not work with low impedance headphones.