Voltage probe (CB8184E)

Found in a 90s Popular Electronics, this circuit uses general-purpose transistors, serving to indicate the polarity of circuits.

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Dual Power Supply with 9 V Battery (CB1344E )
The operational amplifier of this low current source may be any of the JFET type. The output...
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This circuit was found in the September 1977 issue of Radio Electronics magazine. The power supply...
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We recommend adding a 470-ohm resistor in series with the potentiometer in this dimmer circuit...