(0.7v rau lub raj silicon thiab 0.3v rau cov raj hauv germanium).
Tus cwj pwm zoo yog nyob rau hauv qhov hluav taws xob hauv hluav taws xob, qhov zoo ntawm ncej ntawm lub diode txuas nrog lub siab muaj peev xwm kawg, lub ncej tsis zoo yog txuas nrog qis kawg, lub diode yuav ua rau dhau, qhov kev txuas hom no hu ua kev ncaj ncees tom ntej. Nws yuav tsum tau muab sau tseg tias, thaum qhov chaw nres tsheb rau pem hauv ntej kom ob hnub ntawm qhov diode tsawg heev, lub diode tseem tsis tau coj thiab cov nraim tam sim no los ntawm qhov diode tsis muaj zog heev. Tsuas yog thaum qhov kev taw qhia rau pem suab nce mus txog ib qho nqi (uas yog hu ua "threshold voltage", tus germantium tube yog kwv yees li 0.2v, thiab lub raj silicon yog li 0.6v), qhov diode tuaj yeem txuas ncaj qha. Lub qhov hluav taws xob ntawm ob hnub ntawm qhov diode no yeej tsis txawv txav (lub germanium tube yog li ntawm 0.3v thiab lub raj silicon yog li 0.7v), uas yog hu ua "positive pressure drop" ntawm qhov diode.
Rov qab cwj pwm hauv hluav taws xob hauv hluav taws xob, diode ntawm qhov tsis tshua muaj hluav taws xob ntawm lub anode, cathode nyob rau hauv high voltage sab, tam sim no yuav luag tsis muaj tam sim no ntws los ntawm diode, lub diode yog los ntawm lub xeev, txoj kev txuas, paub li nrawm. Thaum lub diode yog nyob rau hauv rov qab thuam, muaj tseem yuav yog ib tug faint rov qab tam sim no ntws los ntawm diode, lub npe hu ua cov leakage tam sim no. Thaum qhov rov qab muaj zog ntawm ob qho tag nrho ntawm qhov diode nce mus rau ib qho nqi, qhov rov qab yuav nce siab, thiab qhov diode yuav plam txoj kev tswj cov kev coj ua, uas yog hu ua qhov tawg ntawm lub diode.