Bee swarming alarm. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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It has been noticed that before swarming, a buzz is heard from the hive from sounds with a frequency of 100 ... 600 Hz. Just before swarming, the hum becomes monotonous and is concentrated in the frequency band 200 - 280 Hz.
The device is a highly sensitive microphone amplifier with a narrow bandwidth from 200 to 280 Hz, loaded with a signal lamp. A selective filter tuned to a frequency of 1 Hz is included in the emitter circuit of the first transistor V240. The second stage has a high gain and is made according to the scheme with a common emitter and with a dynamic load on transistors V2 and V3. The third stage is made according to a similar scheme, but loaded on a resonant circuit, also tuned to a frequency of 240 Hz.
The signal from the resonant circuit is fed to the amplitude detector on the diode VD1 and a two-stage DC amplifier on transistors V6 and V7, loaded with an incandescent lamp H1 (6,3 V).
Details. Alarm sensor - dynamic microphone, for example type MD-47; coils L1 and L2 are wound on a permalloy core W8 x 6 with an air gap thickness of 1,5 mm and contain 2000 turns of PELSHO-0,1 wire each; coil L2 has a tap from the 800th turn.
Establishment comes down to setting DC modes with resistors marked with an asterisk. The circuits are adjusted by selecting the capacitance of capacitors C4 and C10.
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