Continuity tester (CB7386E)

This circuit was found in a Hands-On Electronics from the 90's. The FET can be any general purpose.

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Summing without adjustment (CB4907E)
This tuning-free circuit was found in an old operating amplifier manual. The setting can serve as...
Dual Voltage Follower (CB6121E)
This circuit is from a 1965 Electronic Design. The transistors may be general purpose and the...
Operational with High Input Impedance (CB3950E)
This voltage amplifier with operational amplifier was found in an old documentation. However, it can...