5-tube commercial radio (T1619E)

This commercial superheterodyne receiver was found in a 1949 Radio Electronics. The circuit uses battery.

CMOS Voltage Doubler (CB15715E)
This voltage doubler is indicated for applications where a voltage equal to twice that applied at the...
Voice Suppressor (CB4751E)
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
Low dissipation biestable (CB6808E)
Obtained in a 1969 Ferranti documentation, this circuit dissipates only 2.2 mW with 4.5 V. The...