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Electrical Current Indicator
I designed this circuit as a simple current indicator for any load ranging from 40
watts to 250 watts. The circuit turns on a small LED, whenever it detects
current flowing to a remote load.
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Electrical Current Indicator - I designed this circuit as a
simple current indicator for any load ranging from 40 watts to 250 watts.
The circuit turns on a small LED, whenever it detects current flowing to a
remote load. …. [Designed by David A. Johnson]
Expanded-scale indicator revisited - 8-Aug-02 Issue of EDN
The visualization aid that a previous Design Idea describes allows only
the expansion of the upper end of the scale (Reference 1]. But what can
you do if, according to your project requirements, you need to expand the
middle region of the scale? Figure 1a illustrates the challenge. A
voltmeter comprises a 100-µA dc meter and a series resistor..... [Design
Idea by Abel Raynus, Armatron International Inc, Melrose, MA]
Free-line indicator stops interruptions - 12/07/00 EDN-Design Ideas.....When
only one phone line is available for two phones, each time you want to make a call,
someone may be using the second phone. A simple circuit lights an LED, which indicates
whether the line is free (Figure 1a]. Batteries are unnecessary; the phone line powers
the circuit, and an accumulator saves energy for an "in use" indication.....scroll to
find this circuit..... [Design Idea by JM Terrade, Clermont-Ferrand, France]
Fuse Monitor/Alarm - a simple way to see if a fuse has blown without
removing it from its holder (added 4/02)
