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R1 VCC IR1 2 Vo O UN 6 BIF ET C1 R2 vC1 IR2 VCC w R3 Figure 1: Square wave generator consisting of an inverting Schmitt trigger circuit and a series RC circuit A square wave generator circuit in Figure 1 is to use a BIFET op-amp with Vcc = +18 V. The circuit is to be designed to produce an output frequency adjustable from 500 Hz to 5 kHz. Select: UTP/LTP = +0.5 V; and Iri(min) = IR2 = 1 mA. For the circuit of Figure 1, determine the minimum charging time, tmin (micro- seconds): 1 For the circuit of Figure 1, determine the maximum charging time, tmax (milli- seconds): 1 For the circuit of Figure 1, determine the output voltage, plus/minus VO (volts): 1 For the circuit of Figure 1, determine the capacitor voltage change between the UTP and the LTP, deltaV (volts): 1 For the circuit of Figure 1, determine the value of capacitor, C1 (micro-Farads): 2 What is the E24 standard value of C1 as determined in the preceding question (micro- Farads): 1

For the circuit of Figure 1, determine the maximum average charging current to the capacitor (through R1), IR1(max) (mlli-Amperes): 1 For the circuit of Figure 1, determine the maximum value of resistor R1, R1(max) (kilo-Ohms): 2 The E24 standard values of R1(max) as determined in the preceding question (kilo- Ohms) are: [x] and [y] in descending order. 1 For the circuit of Figure 1, determine the minimum value of resistor R1, R1(min) (kilo- Ohms): 2 The E24 standard values of R1(min) as determined in the preceding question (kilo- Ohms) are: (a) and in ascending order. 1 For the circuit of Figure 1, determine the value of resistor R3, (Ohms): 2 What is the E24 standard value of R3 as determined in the preceding question (Ohms): 1 For the circuit of Figure 1, determine the value of resistor R2, (kilo-Ohms): 2 What is the E24 standard value of R2 as determined in the preceding question (kilo- Ohms): 1