3-tube receiver 2 (T1603E)

Using known tubes, this receiver was found in a Radio Electronics from 1949. The circuit does not include the power supply.

NAND Gate LM3900 (CB5046E)
As in the previous case (CB5045E), we have in the circuit of the figure the use of the polarized...
Synchronized photoelectric switch (CB6864E)
This switch can only be triggered when the mains voltage goes through zero and can operate as a...
LM3909 2Hz Fast Flasher (CB25424E)
This circuit was found in the January 1992 issue of Radio Electronics magazine. The capacitor...