Consider the circuit shown in Fig. The circuit uses an ideal operational amplifier. Assuming that the impedances at noodes A and B do not load the preceeding bridge circuit, calculate the output voltage V_o.

when $${R_a}\, = \,{R_b}\, = \,{R_c}\,{R_d}\,$$ ohms.
when $${R_a}\, = \,{R_b}\, = {R_c}\, = 100$$ ohms and $${R_{d\,}}\, = \,120$$ ohms.

The circuit of fig. uses an ideal OP_Amp for small positive values of V_in, the circuit works as

If the transistors in fig. has high value of β and a v_BE of 0.65, the current I flowing through the 2 kilo ohms resistance will be ______.

An n-channel JFET has a pinch-off voltage of V_p = -5V. V_DS(max) = 20V and g_m = 2mA/V. The minimum 'ON' resistance is achieved in the JFET for