De foarte multe ori este necesară modificarea vitezei unui micromotor montat pe un model telecomandat. Comod, acest lucru se poate realiza dacă se foloseşte un montaj Darlington cu două tranzistoare de acelasi tip, pnp sau npn, schema fiind absolut simetrică faţă de sursa de alimentare (fig. 84).
Reglajul propriu-zis se face din potenţiometrul de 5 kΩ (bobinat), cu care se schimbă polarizarea bazei tranzistorului BC108. Curentul de emitor al acestui tranzistor este aplicat în baza tranzistorului 2N3055 sau 2N3446, care se deschide mai mult sau mai puţin, deci i se modifică curentul de colector. Cum motorul este conectat în serie cu acest tranzistor de putere, curentul prin motor va fi variabil obţinîndu-se astfel variaţia vitezei.Se Poate folosi şi o pereche de tranzistoare EFT323 şi EFT212. Motoraşul lucrează la tensiunea de 6 V şi curent de maxim 1 A.
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