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Circuit Bench

Precision Power Supply (CB21573E)
Using the LM317 (or LM350), this circuit is based on precision regulatory components such as those...
Transistor Tester (CB4370E)
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
Programmable Sequential (CB16960E)
This 20 LED sequential circuit uses components that are still common today. The circuit was found...