Probe based on a miniature relay. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Description of the probe without a battery, given in the magazine (see D. Mamichev "Miniature Relay Probe"in "Radio", 2004, No. 4 p. 56), very timely and relevant. I want to share my experience. The relay does not need to be completely disassembled. All or several contacts must be left at the relay, which will act as a return spring.
A small piece of a ferrite magnet should be glued to the relay armature with any glue, preferably epoxy (see figure). A hemispherical drop of glue protruding from the relay housing with a sawn off top cover will act as a button that ensures the operation of the device. This solution eliminates the need to keep a magnetized screwdriver handy. The movement of a magnet fixed on the armature of the relay, according to the law of electromagnetic induction, induces some EMF in the winding.
They work with a probe like this: having connected in series the relay winding, a pointer indicator (from an old tape recorder) and a section of the circuit under test, they press an impromptu "button". The deflection of the arrow indicates the presence of current and, therefore, the absence of an open circuit.
Author: Yu.Romanikhin, Tyumen
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