nº958

 

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. 

nº957

 

Super-regen radio receiver for the FM band with audio amplifier KA2212, supply 5V

nº956

 

Experimental short range RF doorbell for FM radio receiver. Two transistors, 40cm wire antenna, supply 9V