60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

Telephone Amplifier II (CB19340E)
We found this telephone amplifier in a European publication from the 1980s. The transistor can be...
1.3 Ohm Analog Switch (CB15566E)
In figure 1 we have an application for NLAS5113, a new device from on Semiconductor...
Current Booster (CB6973E)
We found this circuit in a Popular Electronics from the 90s. Transistors can be modern...