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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Automotive Temperature Monitor (CB6045E)
This circuit was found in a Texas Instruments documentation from the 1980s. The circuit monitors...
Speed Game (CB5032E)
This circuit was obtained from a Popular Electronics of 1994. The magazine no longer exists in its...
PNP Constant Current Source (CB1242E)
The load current can be adjusted up to about 1 A. The transistor can be TIP32 or TIP42. The...