This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
August 2017 - Mouser Electronics already has in stock the new INA180 and INA181 current sensing...
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aaa The circuit shown generates 100 kHz signals for calibrating the scale of a receiver in 100 to...