Low noise amplifier (T466E)

Found in 1948 MIT documentation, this 4-tube amplifier is characterized by its low noise level.

Converter Voltage Period (CB6603E)
We find this circuit in an Electronic Design of the 90s. The used integrated circuit admits...
10 Hz Low Pass Filter (CB1465E)
This circuit was originally designed for medical applications and biological experiments. The...
Shooting in the Dark (CB3843E)
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...