Electronic guide. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in medicine
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This small device is a low-frequency generator based on transistors T2 and T3 with a phototransistor T1, the role of which can be played by any low-power transistor with a remote cap. In the front wall of the case, against the semiconductor plate of the phototransistor, a collecting lens is attached. Using a clip, the device is attached to the jacket pocket with the lens facing forward.
The light reflected by the objects is focused by the lens and acts on the phototransistor, changing its resistance. At the same time, the frequency of the generator and the sound in the phone also change. According to the tone in the phone, a person using such a device can navigate in his surroundings. As a transistor T2, you can use any germanium, reverse conductivity, with the largest possible h21E. As T3, it is better to use MP41, MP42.
Literature
- Radio No. 11 1967
Publication: cxem.net
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