Direct Conversion receiver built using available parts. The heart of it is the detector "borrowed" from Belka-DX design by "Oleg 9" user on cqham.ru forum. It requires neither RF transformers nor differential amplifiers, yet accumulates the signal energy from both half-periods thanks to the clever switched capacitor design. The detector I and Q channels are amplifiedby BJT preamps with input impedance of about 50 Ohm each. There is a reasonable impedance match in the audio band, and no noisy resistors on the output. I didn't measure the sensitivity yet, but it works well on 20m, with the noise floor well below ambient with a random wire antenna in a relatively quiet suburban location. The phasing SSB demodulator is a well known all-pass circuit, using TL974 opamp in DIP-14 package. It works fine from the 3V supply. The circuit can be supplied from 3..4.2V directly to the "3V3" connector, or from 5..12V through the onboard regulator. The quadrature VFO I am using is a $2 clone Si5351A board from Aliexpress, plus a $1 Arduino compatible board (same source) using lgt8f328p MCU. For testing, it is running a sketch generating fixed frequency (14080kHz FT4) I and Q phases on CLK0 and CLK1 outputs. Both boards are supplied from the same 3.3V rail as the rest of the receiver. I will try answer questions here: [https://groups.io/g/qrptech](https://groups.io/g/qrptech)