light probe. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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When repairing equipment with a volumetric arrangement of radio components located in hard-to-reach places (for example, oscilloscope mode switches), there is often a need for a low-power local light source. Lighting from general sources gives a weak light, and powerful local sources of light, such as incandescent table lamps, which are located in the workplace, give a strong reflection and a lot of shadows, which introduces additional inconvenience.
To speed up troubleshooting, I suggest using the light probe shown in the figure.
The probe consists of a miniature incandescent light bulb type CMH9-60 (pos.1), a transparent rod from a gel pen with an outer diameter of 4,75 mm (pos.4), connecting wires (pos.3) of the brand NVN-4 with an outer diameter for insulation 1,25 mm and plugs (pos.6) for connecting the probe to the B5-27 power supply. One of the flexible leads of the light bulb is shortened, respectively, one of the connecting wires is shortened. The wires are soldered to the bulb. The shortened terminal (pos. 2) is insulated with a thin adhesive tape. The connecting conductors, through which the supply voltage is applied, are fixed from axial displacement in the inner space of the rod due to radial friction, since they are threaded through two grooves (pos. 5) cut in the rod body using a round needle file.
The rod provides sufficient rigidity for mechanical protection of the light bulb and the structure as a whole. The inner diameter of the rod is 3,2 mm. The outer diameter of the bulb SMN9-60 is 3 mm.
When repairing lamp structures, the probe can be connected directly to the lamp filament circuit. If the radio amateur has a soldering iron with a step-down transformer (PT), for example, from the electric soldering kit 2.940 005 TU, produced by the Mayak Vinnitsa plant, then by installing additional petals in the lower connector in sockets 4 and 5 and applying a voltage of 4 V to them ( available in the PT), you can connect the probe and use the soldering iron connected to the top connector at the same time.
The PT scheme is published in [1].
References:
- Elkin S.A. Transformer for a soldering iron - charger and power supply / / Electrician. - 2003. - No. 8. - p.12
Author: S.A. Elkin
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