Four stages fading sequencer. Two transistors per stage, supply +5V_USB.
Simple RC low pass filter for measuring stand-by DC current consumption of devices having pulsed currents. Time constant adjustable from 0.6s to 30s.
Minimalist MW experimental regenerative radio receiver. Only ferrite rod antenna; 1 transistor; audio output with 32+32ohm common earphones; no tickler coil; supply 2xNiMH. Can satisfactory tune during daylight to AM broadcast station disted about 30Km from 50kW transmitter.