Light out switch (CB8331E)

This highly sensitive circuit was found in a 1967 General Electric SCR manual. Equivalent components can be used.

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Audio voltmeter (CB23863E)
The assembly of this circuit with 3 transistors was described in an article in Radio Electronics magazine...
Solar Power Supply (CB25215E)
The circuit is from a Radio Electronics from August 1989. The cells used at that time did not have...
Data Selector with the 4051 CMOS (CB11492E)
The 4051 in the configuration shown in the figure can be used as a selector of both analog and...