3-tube receiver (T1602E)

Found in a 1949 Radio Electronics, this circuit employs vacuum tubes of the time. Power supply not provided.

Password Lock (CB21545E)
We found this circuit in a 1998 documentation. The circuit makes use of CMOS logic and must be...
Programmed gain amplifier (CB7266E)
Suggested by Siliconix in documentation from the 90s, this amplifier has its gain digitally...
Video amplifier 2 (CB9418E)
Found in an old American publication, this is one of many possible configurations for an analog...