9 V to 5 V converter LT1175 (CB14616E)

We found this circuit in the 1997 Linear Technology Applications. The components used were common at the time.

Visual dialing indicator (CB9296E)
Used with telephones at the time, this circuit was found in Popular Electronics from the 90s. The...
Phone Patch 2 (CB9399E)
Found in a 1965 CQ magazine, this circuit uses period components. The unijunction transistor can...
Dimmer with Triac (CB12326E)
This dimmer configuration is quite old, as it was found in a 1967 publication. The triac can be of...