Montajul este constituit dintr-un oscilator de audiofrecventa, comandat de un multivibrator cu constanta mare de timp.
Oscilatorul de audiofrecventa este realizat cu tranzistorul T2 (reactia emiter-colector) cu impedanta mare = 12 Kohmi. Droselul intirzie reactia si oscilatiile se amortizeaza datorita variatiei tensiunii de polarizare a lui T2.
Dar cum T2 si Tl constituie un multivibrator, tensiunea pe baza lui T2 variaza in timp determinat cu capacitatile si rezistentele din circuitele de colector.
Cu ajutorul potentiometrului de 50 Kohmi se regleaza constanta de timp.
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