31. In this application, the sum and difference of two input voltages are formed using operational amplifiers. 32. The positive feedback is introduced by adding a part of the output voltage to the input voltage . 33. If the input voltage approaches the desired output voltage, the regulator will " drop out ". 34. The gain of the vertical amplifier can be adjusted to suit the amplitude of the input voltage . 35. Increasing the input voltage increases the rate of charging the capacitor, decreasing the time between switching events. 36. At low input voltage , the TTL input sources current which must be absorbed by the previous stage. 37. The circuit is insensitive to the input voltage variations and the transistor stays firmly in active linear region. 38. All linear regulators require an input voltage at least some minimum amount higher than the desired output voltage. 39. Input voltage may be, for example, 115 kV, or whatever is common in the area.40. It is an inverting converter, so the output voltage is negative with respect to the input voltage .
