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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Probably, many in their amateur radio practice have come across a situation where they need to “ring out the circuit”, and the batteries of the device do not work for one reason or another. On the pages of the Radio magazine, descriptions of various designs of probes without a power source have already been repeatedly met (for example, the article by S. Levchenko, V. Vedutov "Probe" without a battery. - Radio, 2003, No. 4, p. 55). the design is somewhat different from the indicated one.Instead of a coil from a polarized relay, I used a coil from a miniature relay of the RES-10 type (passport RS4. 524.316) with a winding resistance of 1600 ohms, and instead of an LED, a pointer indicator of the M4387 type (from an old tape recorder) with a frame resistance of about 300-400 Ohm.Such changes allow you to assemble the probe both as a separate device (Fig. 1), and as an attachment to an existing "pointer" avometer (Fig. 2), and the high sensitivity of the microammeter allows, along with a permanent magnet, to use a magnetized screwdriver (which happens to be at hand more often).
Now a few words about the capabilities and operation of the probe. It allows you to check the integrity of the windings of relays, transformers, electric motors, filaments of incandescent lamps, fuses, pn junctions of powerful transistors, frames of electrical measuring instruments. When lightly tapping with a magnetized screwdriver on the core of the relay coil, the indicator arrow begins to oscillate, which indicates the operability of the electrical circuit.
More about the design. The probe (see Fig. 1) is mounted on a board made of foil-coated getinax or textolite (Fig. 3). The cover is carefully removed from the electromagnetic relay and the contact group is removed along with the anchor, the extra conclusions are bitten off. One output of the probe X2 is made with a flexible wire with a crocodile clip, and the other - X1 - in the form of a needle, for which a spiral of soft steel wire with a diameter of 0,8 mm is wound around the pin from the power plug with a tap 20 ... 25 mm long .
In the case of the manufacture of the probe as an attachment (see Fig. 2), in order not to disturb the graduation of the scale of the head of the avometer RA1, a shunt switch SA1 is connected to the relay coil K1. The avometer for operation is transferred to the DC current measurement mode to the smallest limit - 0,5 mA. The parts of the probe are mounted inside the housing on any side wall so that the heel of the relay core "peeks" outward.
In conclusion about the details. In principle, any other pointer indicator can be used, preferably with a full deflection current of the pointer no more than 1 mA. Relay RES-10 - any, with a winding resistance of 1600 ... 4500 Ohm, SA1 switch - any suitable size. Instead of a magnetized screwdriver, you can use a magnetized piece of a hacksaw blade, a metal ruler, or just a magnet.
Author: D. Mamichev, p/o Shatalovo-1, Smolensk region.
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