Broadband amplifier (CB9005E)

For a 75ohm output, this circuit was found in ancient American documentation, using components from the time.

1-Wire 2-Relay Control (CB4154E)
This configuration, already found in other articles in this section and on this site, was obtained...
Blocking Oscillator (CB21815E)
We found this circuit in the 1960 Mullard transistor manual. The transistor is made of germanium....
Bridge High Impedance Amplifier (CB4937E)
This circuit is from the 80's and can be implemented with modern operational amplifiers equivalent...