500 circuits for radio amateurs. Modern circuitry in the light. Effective power of fluorescent, halogen lamps, LEDs, elements Smart House CD. / 500 skhem dlya radiolyubiteley. Sovremennaya skhemotekhnika v osveshchenii. Effektivnoe elektropitanie lyuministsentnykh , galogennykh lamp, svetodiodov, elementov Umnogo doma CD.