Field strength meter (CB9740E)

This circuit, with adjusted sensitivity, can use common general-purpose transistors. The circuit is from old documentation and powered by batteries.

TTL Power Shield or Interface (CB4617E)
In this circuit we show how it is possible to control a high power load (which depends on the...
OPAx196 Texas Instruments Power Operational Amplifiers
Texas Instruments' low power operational amplifiers OPAx196 can be found on Mouser Electronics....
Perforated tape reader (CB8264E)
This circuit by Ferranti, in a 1967 publication, is intended for reading perforated tapes. The...