Pentru testarea montajelor analogice (amplificatoare, mixere, etc.) sau a celor digitale este nevoie de un generator de functii. Daca in cazul montajelor digitale este suficient un semnal dreptunghiular situatia se schimba in cazul unui amplificator. Pentru aprecierea liniaritatii sau a benzii de frecventa sunt necesare si semnale de forma sinusoidala, triunghiulara, trapezoidala, etc.
In cele ce urmeaza este prezentat un montaj care satisface in mare masura dezideratele enutate. Oscilatorul este compus dintr-un integrator (G1) si un trigger Schmidt (G1, G2). Poarta G4 functioneaza ca formator de sinusoida. Factorul de umplere se ajusteaza din potentiometrul P1, iar frecventa se regleaza din P2. Pot fi utilizate portile continute de capsulele CMOS 4011, 4001sau 4 negatoare din capsula 4069. Tensiunea de alimentare nu este critica putand lua orice valoare intre 5 si l2Vc.c. cu conditia sa fie stabilizata si bine filtrata.
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