erictham83
New Member
i am wishing to design a symmetrical astable multivibrator circuit (Figure 1) to run at a frequency of about 1 kHz by 4.7 kΩ resistors for the collector loads (RC1, RC2).
How can i choose the resistor values for RB1, RB2, (assume RB1 and Rb2 are equal value) to ensure that the transistors saturate when ON if the minimum current gain of the transistors is 100 in the linear region.
How can i select capacitor values to give a free-running frequency of about 1 kHz (+/- 25%) (assume than i mayy have to reselect the values of RB1, RB2 as only a limited range of capacitors is available.)
given the oscillator frequency of multivibrator is approximate:
f=1/[0.693RB1C1+0.693RB2C2]
Thanks and i wish someone can teach me how to do calculation of this circuit.
How can i choose the resistor values for RB1, RB2, (assume RB1 and Rb2 are equal value) to ensure that the transistors saturate when ON if the minimum current gain of the transistors is 100 in the linear region.
How can i select capacitor values to give a free-running frequency of about 1 kHz (+/- 25%) (assume than i mayy have to reselect the values of RB1, RB2 as only a limited range of capacitors is available.)
given the oscillator frequency of multivibrator is approximate:
f=1/[0.693RB1C1+0.693RB2C2]
Thanks and i wish someone can teach me how to do calculation of this circuit.