Ultrasonic Proximity Sensor (CB21312E)

This circuit was found in a Popular Electronics from the 90s. The circuit uses a ceramic capsule as an emitter and detector.

LM359 Fast Difference Amplifier (CB14374E)
The focused circuit was found in the National Semiconductor's Linear Applications Handbook of...
Darlington Linear (CB6122E)
This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the...
Battery Charger (CB6055E)
This circuit was suggested by Texas Instruments in a 1980s documentation. The transistor must be...