Universal car probe (two in one). Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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Although the probe on a car light bulb is primitive today, it is still used to detect a malfunction in the electrical equipment of a car, due to its simplicity and accessibility. Any car enthusiast can find a light bulb, you need to solder two wires to it and the probe is ready. But such a probe also has disadvantages.
The proposed probe (Fig. 1) has the following technical capabilities:
- automatic polarity detection (plus where one of the bulbs shines);
- the ability to determine the alternating voltage (both lights are on);
- universality (12 and 24 V);
- high survivability (if one light bulb burns out, then the test can be completed with another);
- Possibility of testing relay-regulators and integral regulators.
The probe is easy to make.
A good idea of an indicator from a disposable syringe by S. Dubovoy [1] was borrowed for the proposed probe (2 syringes are needed) - Fig. 2, where 1 is a metal pin; 2 - disposable syringe; 3 - diodes; 4 - light bulb; 5 - cut piston; 6 - wire.
Elements HL1, VD1, VD2 are placed in one syringe, and HL2, VD3, VD4 - in another. Two parts of the probe are connected by one wire. The bulbs for the probe are taken from the backlight of the car's panel instruments. To determine which bulb is which, colored polyethylene filters are inserted inside the syringes, they also serve as seals for the rear plug. Light filters can be cut from used plastic bottles of different colors.
An added convenience is a crocodile clip that fits over both probe probes.
The proposed probe has been in operation for more than a year and has proven itself well.
Literature
- Oak S. Phase wire indicator//Radioamator-Electric. - 2000. - No. 8. - P.8.
Author: S.M.Usenko, Chernihiv region
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