nº954

 

Prototype of clap lamp switch for lamps having E27 holder, supply 230Vac/50Hz

nº953

 

Experimental TRF regenerative MW receiver with 1 transistor; audio output by piezoelectric speaker, 10mts wire antenna + PE connection, supply 9V.

nº952

 

Simple MW reflex radio using audio amplifier KA2212, supply 9V

nº951

 

Simple MW reflex radio based on audio amplifier TDA1013B, supply 12V