Pescarii amatori stiu ca pestii „trag” mai bine atunci cind momeala se misca.
O astfel de undita se poate construi usor de orice incepator in ale radiotehnicii, dintr-o undita obisnuita, un releu electromagnetic si citeva piese radio.
Partea electronica o constituie un multivibrator cu frecventa variabila ale carui impulsuri sint amplificate de un tranzistor, ce are in circuitul de colector un releu telefonic de armatura, caruia Sc leaga firul unditei.
Cu ajutorul potentiometrului de 50 K, se poate regla frecventa oscilatiilor in limitele 50 —200 pe minut.
Montajul este alimentat de la o baterie miniatura de 9 V. Consumul este de 15—20 mA.
Tranzistorii sint de joasa frecventa cubeta intre 20—40.
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