FET caracteristic curve plotter (CB20730E)

Found in American documentation from the 90s, this circuit uses components that are still common today. The 15 V power supply must be symmetrical.

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Micropower Clock (CB6504E)
This 200 kHz oscillator was found on a 90's EDN. It consumes only 2.8 mW and has CMOS compatible...
TTL Logical Test (CB13254E)
Although we found this circuit in an old documentation from the 70's it can still be assembled with TTL...
Continuity test (CB9328E)
This audible continuity test was obtained in a book from the 90's describing simple projects. The...